[Lý] Vật lí vui

[Braveheart7472]

Ái xời câu này em nghĩ ai cũng biết rùi. Đầu tiên quay quả trứng trên 1 mp, sau đó chạm tay vào vào rùi thả ra lập tức, trứng chín thì dừng lại, sống thì quaytiêp

[ܓܨOrion.p0n]

c:embarrassed: một phương án đấy ... em có một mớ phương án khác cũng hay ho không kém :D
nghĩ thêm đi anh em

[HoangHiep12C6]

1-soi lên ánh sáng, trứng chín không cho AS đi qua
2-thả vào nước, trứng chín sẽ chìm
3-bỏ lên cân, trứng chín nặng hơn
4-gõ nhẹ vỏ trứng, chín thì ko kêu or kêu đục
5-lăn cùng 1 lực trên mặt bằng, chín lăn đều và xa hơn
nếu ko dc thí nghiệm tí nào thì chỉ cần nhìn kỹ, sẽ thâý trứng chín mất độ bóng của vỏ

[ܓܨOrion.p0n]

1-soi lên ánh sáng, trứng chín không cho AS đi qua
2-thả vào nước, trứng chín sẽ chìm
3-bỏ lên cân, trứng chín nặng hơn
4-gõ nhẹ vỏ trứng, chín thì ko kêu or kêu đục
5-lăn cùng 1 lực trên mặt bằng, chín lăn đều và xa hơn
nếu ko dc thí nghiệm tí nào thì chỉ cần nhìn kỹ, sẽ thâý trứng chín mất độ bóng của vỏ

chép nguyên trong vật lí VN ah anh, tụi em không lấy đề ở đó hỏi ra rồi đáp án cũng lấy ra ở đó đâu c:smile:

[HoangHiep12C6]

Có 1 cách của anh đó là nếm ;))

[atlantic_fly]

Hình như hội phó có quyển vật lí lí thú thì phải ,coi hộ anh coi nguyên nhân nước làm tắt lửa là chi !

[thanhkhoeo]

nước tách chất cháy với oxi nên chất cháy không có điều kiện phản ứng cháy lí do nữa là nhiệt độ của nước khá thấp nên làm giảm nhiệt độ cháy

[Braveheart7472]

Dưới đây là giải thích của nhà vật lý Ia. I. Perenman.

Thứ nhất, hễ nước gặp một vật đang cháy thì nó biến thành hơi và hơi này lấy đi rất nhiều nhiệt của vật đang cháy. Nhiệt cần thiết để biến nước sôi thành hơi nhiều gấp 5 lần nhiệt cần thiết để đun cùng thể tích nước lạnh ấy lên 100 độ.

Thứ hai, hơi nước hình thành lúc ấy chiếm một thể tích lớn gấp mấy trăm lần thể tích của khối nước sinh ra nó. Khối hơi nước này bao vây xung quanh vật đang cháy, không cho nó tiếp xúc với không khí. Thiếu không khí, sự cháy sẽ không thể duy trì được.

Để tăng cường khả năng làm dập lửa của nước, đôi khi người ta còn cho thêm … thuốc súng vào nước. Điều này thoạt nghe thì thấy lạ, nhưng rất có lý: thuốc súng bị đốt hết rất nhanh, đồng thời sinh ra rất nhiều chất khí không cháy. Những chất khí này bao vây lấy vật thể, làm cho sự cháy gặp khó khăn.

[ܓܨOrion.p0n]

c:look_down: cái này tớ thấy rồi
tuy nhiên phần giải thích cũng chỉ là ý kiến của một người ... tuy nhiên đây là ý kiến đúng

[thanhkhoeo]

Dưới đây là giải thích của nhà vật lý Ia. I. Perenman.

Thứ nhất, hễ nước gặp một vật đang cháy thì nó biến thành hơi và hơi này lấy đi rất nhiều nhiệt của vật đang cháy. Nhiệt cần thiết để biến nước sôi thành hơi nhiều gấp 5 lần nhiệt cần thiết để đun cùng thể tích nước lạnh ấy lên 100 độ.

Thứ hai, hơi nước hình thành lúc ấy chiếm một thể tích lớn gấp mấy trăm lần thể tích của khối nước sinh ra nó. Khối hơi nước này bao vây xung quanh vật đang cháy, không cho nó tiếp xúc với không khí. Thiếu không khí, sự cháy sẽ không thể duy trì được.

Để tăng cường khả năng làm dập lửa của nước, đôi khi người ta còn cho thêm … thuốc súng vào nước. Điều này thoạt nghe thì thấy lạ, nhưng rất có lý: thuốc súng bị đốt hết rất nhanh, đồng thời sinh ra rất nhiều chất khí không cháy. Những chất khí này bao vây lấy vật thể, làm cho sự cháy gặp khó khăn.

cậu chỉ làm rõ thêm mấy ý của tớ mà thôi . tớ nói thế là đủ rồi

[Braveheart7472]

Ai có thể giải thích cho mình tại sao nước bám trên mặt đường làm cho mặt đường trơn, còn nước bám trên da thì lại tăng ma sát trên da.

[thanhkhoeo]

câu này chỉ đúng với mặt đường nhựa còn dường xi măng thì sai hoàn toàn

li do là do hiện tượng dính ướt mà thôi da dính ướt, nhựa thì không

[atlantic_fly]

Nói về ma sát ,mình còn muôn vàn vấn đề thắc mắc ,ma sát thật phức tạp .
Ai cũng biết ma sát không phụ thuộc vào viện tích tiếp xúc ,vậy tại sao lốp xe đạp non đi lại nặng!

[ܓܨOrion.p0n]

tớ đoán cái này chẳng liên quan gì đến ma sát cả
bánh xe căng lốp thì một vòng quay được nhiều hơn
một ý nữa là nó có liên quan đến áp suất, lốp căng thì tăng áp suất làm xe bám đường tốt hơn ...

[atlantic_fly]

Nói vậy thì bánh càng to đi càng đỡ mệt rồi ,theo mình vấn đề này rất hay ,nó có liên quan đến ma sát .
Mình tìm được 1 cách giải thích mà theo mình nghĩ là chấp nhận được ,các bạn thử tìm tiếp các nguyên nhân xem!

[thanhkhoeo]

Như các bạn đã biết khi chúng ta đứng trên mặt đất , sẽ có một trọng lực P tác dụng xuống đất, theo định luật III sẽ xuất hiện 1 lực do mặt đất tác dụng lại là phản lực N, 2 lực này cân bằng và ta vẫn đứng yên, sao ta đứng trên nước thì không được ?

[le_tai_ngoc00]

Sức căng bề mặt của nước bé như vậy, người lại nặng 5,6 chục cân, chỉ đứng trên 2 chân khoảng 300cm^2, không chìm hơi phí, hihi.
-----------------------------------------

tớ đoán cái này chẳng liên quan gì đến ma sát cả
bánh xe căng lốp thì một vòng quay được nhiều hơn
một ý nữa là nó có liên quan đến áp suất, lốp căng thì tăng áp suất làm xe bám đường tốt hơn ...

Ta đều biết Fms = k.R (R : áp lực) R= p.S
Phải chăng khi lốp căng, diện tích tiếp xúc bé, -> R bé, còn khi lốp non, S lớn -> R lớn, cho nên............. đúng ko nhỉ...c:doubt:

[atlantic_fly]

Theo em khi S tăng bao nhiêu lần thì p giảm bấy nhiêu lần (R luôn không đổi ,bằng trọng lực )
Lực ma sát không phụ thuộc vào diện tích tiếp xúc nên giả thiết có lẽ không chuẩn cho lắm .
Cái này theo em giải thích dựa vào ma sát lăn ,khi lốp non tay đòn của ngẫu lực :trọng lực và phản lực tăng làm tăng tác dụng của mo men cản làm cho ta đạp xe cảm thấy nặng hơn !

[le_tai_ngoc00]

Theo em khi S tăng bao nhiêu lần thì p giảm bấy nhiêu lần (R luôn không đổi ,bằng trọng lực )
Lực ma sát không phụ thuộc vào diện tích tiếp xúc nên giả thiết có lẽ không chuẩn cho lắm .
Cái này theo em giải thích dựa vào ma sát lăn ,khi lốp non tay đòn của ngẫu lực :trọng lực và phản lực tăng làm tăng tác dụng của mo men cản làm cho ta đạp xe cảm thấy nặng hơn !

Uhm, chuẩn rồi, anh vừa xem lại sách, hi, cái nì cũng ko nhớ rõ lắm. Trong trường hợp này lực kéo và lực ma sát tạo ra ngẫu lục quay làm xe tiến, còn trọng lực và phản lực tạo ra ngẫu lực cản c:smile:

[thanhkhoeo]

ccaau nà em hỏi rồi chị xem l;ậi mấy trang trwuowsc nhé

[voimonster]

Cả nhà ơi cho em hỏi!
Tại sao một cục pin không thể tồn tại
Suất điện động = 2v và cường độ dòng điện cũng bằng hai vôn vậy?
c:adore:c:adore:c:adore: 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[thanhkhoeo]

mình không hiểu bạn hỏi gì theo tớ thì có thể mà bạn

[ܓܨOrion.p0n]

c:beat_brick:sao ta đứng trên nước thì không được ?
câu hỏi này hơi thừa =.=

[thanhkhoeo]

Chị ngại giở lại , em gửi câu TrLời sang pro5 cho chị vs nhé:D

câu nay em tìm mzaf không thấy thôi viết luôn

vì lực căng bề mặt của nước thấp nên sẽ bị lún đất còn lún nữa là nước

[Caramel]

Nước bốc hơi khỏi bề mặt da mang theo nhiệt của cơ thể. Gió càng mạnh hơi nước bốc càng nhanh, càng nhiều-->càng mát.

[thanhkhoeo]

Nước bốc hơi khỏi bề mặt da mang theo nhiệt của cơ thể. Gió càng mạnh hơi nước bốc càng nhanh, càng nhiều-->càng mát.
chuẩn không cần chỉng luôn :-$:-$o-+o-+@};-@};-:))

[Caramel]

Điêu , ai bảo anh thế :)):)):))
Hx. Ngày xưa mình ghét cô chủ nhiệm nên ghét lun môn Lý. Babe giải thích hộ với :D

[Braveheart7472]

Khi gió thổi vào người, nhiệt sẽ thoát qua các lỗ chân lông trên da ( khi nóng thì các lỗ ấy mở ra). Hạ nhiệt độ thì ta sẽ cảm thấy mát.c:look_down:

[minh_hg]

Đơn giản là vì cơ thể tỏa nhiệt chủ yếu bằng đối lưu nên khi ngồi quạt, khối khí nóng xung quanh cơ thể đc thay đổi liên tục bằng các luống khí mát -> nhiệt độ ko khí xung quanh luôn thấp hơn thân nhiệt cơ thể -> đối lưu xảy ra mạnh và liên tục nên ta cảm thấy mát

[Caramel]

Mình nghĩ do cả đối lưu của không khí xung quanh và cả hơi nước bốc hơi nữa. Babe đâu oy vào trả lời đi kìa :D

[voimonster]

giải thích giùm em : tại sao khi bỏ một vật tròn trong một vật tròn khi quay nó trong một vật tròn nữa thì vật quay mãi không dừng. http://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.png

[atlantic_fly]

Trước khi trả lời câu hỏi của bạn ,cho mình biết xuất sứ của nó !

[voimonster]

Em thử bỏ một hòn bi sắt (bi xe đạp trong một quả bóng bay) Quả bóng bay được thổi trong một quả bóng bay khác. Khi xoay em thấy viên bi này xoay mãi ko dừng. http://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.png

[xoxodetoan]

Câu đó khó thế. khó không chịu 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[atlantic_fly]

Hay nhỉ ,anh rất hoan nghênh em ,vật lí không ở đâu xa lạ mà xuất hiện trong đời sống của chúng ta .
Tập giải thích các hiện tượng là một các rất tốt để chúng ta rèn luyện tư duy .
Nhưng : hiện tượng em nêu ra cần có sự rõ ràng ,phiền em mô ta thật kĩ thí nghiệm của em .
VD :
-Các quả bóng bay có tiếp xúc với nhau không?
-Em xoay bi hay xoay quả bóng bên ngoài hoặc bên trong ?

[vicvip]

mìn thích nhất môn vật lý, tại vì mình có cô giáo rất xinhc:byebye:

[voimonster]

Các quả bóng và bi đều tiếp xúc với nhau. Em xoay bi bằng cách xoay bóng. Bóng các to và tròn thi xoay càng lâu. Lâu đến mức em để từ tối đến tận trưa hôm sau nó mới dừng. http://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.pnghttp://i0001.photobucket.com/albums/0001/PBWhatsNew/adjustmentbureaumovie.png

[atlantic_fly]

Nghe em nói về thí nghiệm của em anh thấy rất hứng thú .
Theo anh việc hòn bi quay rất lâu được giải thích như sau :
-Hệ số ma sát giữa bóng và bi là nhỏ.
-Diện tích tiếp xúc giữa bi và bóng là nhỏ .
Ban đầu thì ta đều nghĩ ma sát đâu có phụ thuộc vào diện tích tiếp xúc ,nhưng với chuyển động quay thì khác ,diện tích tiếp xúc tỉ lệ thuận với bán kính quay mà mo men cản quay bằng F*R nên diện tích tiếp xúc càng nhỏ thì vật quay càng lâu
Diện tích tiếp xúc nhỏ là do vỏ bóng bay chịu tác dụng của áp lực khí nên đã dãn hết cỡ khó bị biến dạng khi tiếp xúc với bi .
Đây là một hiện tượng hay ,trên đây chỉ là vài giả thiết của anh ,nếu có điều kiện anh sẽ tận tay làm thí nghiệm ,biết đâu lại tìm ra được điều gì hay !

[voimonster]

Vâng!
Thêm một câu hỏi nữa: có một con ngựa kéo xe bình thường tối đa được 5000N.
vậy mà lấy hai con ngựa như thế lại có thể kéo tới 15000N ? (Câu hỏi này đã được các nhà khoa học thí nghiệm, họ chưa giải được, em post cho mọi người xem)
Em đang phân vân , chắc cái này không giải thích bằng vật lí mà là sinh học chăng? 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[van_anh_hoa]

Mình muốn biết trong hai trường hợp ngựa kéo cùng một chiếc xe hay là hai chiếc xe khác nhau

[voimonster]

Cả hai ngựa đều kéo một xe !                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   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[van_anh_hoa]

Nếu có clip về thí nghiệm này rất mong bạn đăng lên !
Sao hội vật lí gì mà không thèm trả lời câu hỏi của người ta vậy ?

[Braveheart7472]

Bạn có thể đưa ra nguồn, link bạn lấy câu này đc ko, mình ko tin vào mắt mình.c:ops:

[voimonster]

Bạn có thể đưa ra nguồn, link bạn lấy câu này đc ko, mình ko tin vào mắt mình.c:ops:

Cái này mình đọc trên một bài báo. Cũng khá lâu rồi, nên không có nguồn dẫn chứng.
Tuy nhiên mình phát hiện ra một điều là: khi đi xe đạp một mình ta thấy bình thường nhưng hai người đi xe đạp nắm tay nhau cùng đạp thì thấy xe nhanh hơn? Không hiểu vì sao thế ? Hay là do cảm giác sai lầm ?c:big_smile:http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%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[thanhkhoeo]

có clip về thí nghiệm này rất mong bạn đăng lên !
Sao hội vật lí gì mà không thèm trả lời câu hỏi của người ta vậy ?
vì nó khó quá bọn em chưa thể trả lời vậy thôi

[voimonster]

Hi` ! mình đưa ra để cùng trao đổi thôi. Không giải được thì biết cho vui vậy. c:big_smile:http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%2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[Braveheart7472]

Mình hỏi thêm 1 chút là con trai với con trai hay con trai với con gái, nếu là con trai với con gái thì điều đó rất dễ hiểu thôi.c:look_down:

[voimonster]

Cả hai trường hợp bạn ạ ! c:big_smile: Bạn giải thích được cái nào thì giải thích giùm cái! c:beauty:http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of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[voimonster]

Các nhà khoa học thường nói: Về những thuyết như thuyết bảo toàn năng lượng, thuyết bảo toàn khối lượng,... Cơ sở chung đại loại là không sinh ra , không mất đi.
Phải chăng vấn đề này cũng áp dụng được trong cuộc sống.!
Thuyết bảo toàn "Tình Yêu":
"Tình yêu không tự sinh ra cũng không tự mất đi, tình yêu chỉ chuyển từ người này sang người khác, tự dạng này sang dạng khác"


Đó là những lý thuyết các học sinh phổ thông được học vậy mà đầu tiên trên thế giới, các nhà khoa học châu Âu đã chế thành công "phản vật chất".
Phản vật chất có nghĩa là các hạt và phản hạt va chạm, chúng tiêu diệt lẫn nhau và giải phóng năng lượng.Vậy phải chăng năng lượng tạo ra vật chất ?

Có một ngịch lí nữa là vũ trụ đang không ngừng to ra thế mà Niu Tơn thường nói mọi vật đều hút nhau. Vậy chúng hút nhau theo kiểu gì đây ?

Anhxtanh có nói khi chuyển động càng nhanh thì thời gian càng chậm lại. Vậy khi chũng ta chuyển động càng chậm thì thời gian càng tăng nhanh à?
( Liên hệ thực tế : một ngày ở hạ giới bằng 1 năm trên thiên đình, suy ra một giây trên thiên đình bằng 365,6 giây ở hạ giới suy ra tốc độ của Phật Tổ Như Lai di chuyển và ra đòn gấp 365,6 lần người thường rồi còn gì? )
c:big_smile:

[Caramel]

Chém gió tí.

Phản vật chất có nghĩa là các hạt và phản hạt va chạm, chúng tiêu diệt lẫn nhau và giải phóng năng lượng.Vậy phải chăng năng lượng tạo ra vật chất ?
Chuẩn. E=mC2. Công thức nói lên tất cả.

Có một ngịch lí nữa là vũ trụ đang không ngừng to ra thế mà Niu Tơn thường nói mọi vật đều hút nhau. Vậy chúng hút nhau theo kiểu gì đây ?
Chúng k những hút nhau mà còn đẩy nhau. Tuy nhiên hiểu cái từ rộng ra theo nghĩa j mới đc. Nôm na là các thiên hà đang xa nhau còn trong các thiên hà thì nhờ cái lực hút Newton đó mà mọi thứ giữ đc ổn định. Đơn giản như Hệ Mặt Trời.

Anhxtanh có nói khi chuyển động càng nhanh thì thời gian càng chậm lại. Vậy khi chũng ta chuyển động càng chậm thì thời gian càng tăng nhanh à?
Hiểu 1 cách đơn giản thì là như vậy. Theo mình cái này nên kệ cụ Anhxtanh với cụ Newton chém gió trên Thiên Đường chứ VN đc mấy bác hiểu hết cái thuyết tương đối của cụ đâu mà.

Liên hệ thực tế : một ngày ở hạ giới bằng 1 năm trên thiên đình, suy ra một giây trên thiên đình bằng 365,6 giây ở hạ giới suy ra tốc độ của Phật Tổ Như Lai di chuyển và ra đòn gấp 365,6 lần người thường rồi còn gì?
Sai bét vì 1 ngày ở thiên đường bằng 1 năm dưới hạ giới. Hì hì.

[voimonster]

Híc ! Viết lộn. 1 Ngày ở thiên đình bằng 1 năm ở hạ giới nên mới suy ra được cái ở dưới. c:big_smile:http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%2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[Braveheart7472]

Các câu hỏi bên trên ko có ai trả lời mình xin phép gác lại,mình xin đưa ra các câu hỏi mới :Vật Lý Vui thưc sự, gần với thực tiễn.
Gọi tuần đầu tiên sau tết là tuần 1 nhé.

Tuần 1
Như chúng ta đã biết,1 khinh khí bay lên cao, đứng yên 1 chỗ trên ko 1h sau đó hạ xuống thì nó sẽ hạ đúng vị trí cũ.
Câu 1: Giải thích điều trên.(câu này dễ)
Câu 2: Giả sử chúng ta có 1 cái khinh khí cầu để bay lên trời,thoát khỏi tầng khí quyển, đứng yên 1h rồi, hạ xuống mặt đất thì vị trí hạ xuống so với vị trí ban đầu như thế nào.
Biết:http://farm2.anhso.net/pic/o/109694/D6D4440D3B7C9C3E8F6C444929E56367D94A3F6AA838416E/3.jpactions=o

[thanhkhoeo]

câu 1 không có gió +lực tác dụng thì rõ rang llaf không di chuyển rồi
câu 2
thứ nhất khinh khí cầu không thể bay lên đc ngoài khí quyển làm gì có không khí mà bay nổ tung từ tầng bình lưu rồi

[mimosa_qn9]

Câu1.do kkc quay cùg vớj tầg khí quyển.
Câu2.hạ xuốg vị trí cách vị trí b.đầu 1khoảg x nào đó về phjá tây.
Đúng ko nhỉ?

[Braveheart7472]

Câu1.do kkc quay cùg vớj tầg khí quyển.
Câu2.hạ xuốg vị trí cách vị trí b.đầu 1khoảg x nào đó về phjá tây.
Đúng ko nhỉ?
Góp ý ;))
_ Chị nên viết đúng chính tả
_ Đọc kĩ đề:chuckle:
_ Câu 2 đề nghị suy nghĩ lại

[atlantic_fly]

Bạn Mi on điện thoại nên việc viết rất khó khăn ,chúng ta nên thông cảm mỗi khi bạn ấy viết sai chính tả !
Mấy câu này quen quen vậy nhỉ !

[thanhkhoeo]

câu 1 không có gió +lực tác dụng thì rõ rang llaf không di chuyển rồi
câu 2
thứ nhất khinh khí cầu không thể bay lên đc ngoài khí quyển làm gì có không khí mà bay nổ tung từ tầng bình lưu rồi

sao đây đúng không thằng huy gầy gò kia

[Braveheart7472]

câu 1 không có gió +lực tác dụng thì rõ rang llaf không di chuyển rồi
câu 2
thứ nhất khinh khí cầu không thể bay lên đc ngoài khí quyển làm gì có không khí mà bay nổ tung từ tầng bình lưu rồi
Sặc,thế tớ mới giả sử, lại mắc bệnh ko đọc kĩ đề.c:beat_brick:

[voimonster]

đây mới là câu vật lí thú vị nè !
Hỏi mấy nhóc xem có trả lời được không?
Có bao giờ có cục bin mà có hiệu điện thế 12 V mà cường độ dòng điện là 12 A không ?
Giải thích ! đúng cho 500dz. c:big_smile:

[Braveheart7472]

đây mới là câu vật lí thú vị nè !
Hỏi mấy nhóc xem có trả lời được không?
Có bao giờ có cục bin mà có hiệu điện thế 12 V mà cường độ dòng điện là 12 A không ?
Giải thích ! đúng cho 500dz. c:big_smile:
Pin đã lắp vào mạch điện chưa mà lại có dòng điện....
Nói thế chứ em vẫn hiểu ý của anh, ko có cục pin như thế vì pin luôn có điện trở trong, do đó I sẽ bé hơn 12A.

[voimonster]

Pin đã lắp vào mạch điện chưa mà lại có dòng điện....
Nói thế chứ em vẫn hiểu ý của anh, ko có cục pin như thế vì pin luôn có điện trở trong, do đó I sẽ bé hơn 12A.

Không cần mắc. Ý anh là giống mấy cục pin đồ chơi trẻ con ấy có hiệu điện thế 1.5 v và cường độ bao nhiêu...
Anh chỉ hỏi là có thể có tồn tại cục pịn như điều kiện anh muốn hỏi không ? c:big_smile:

[Braveheart7472]

Không cần mắc. Ý anh là giống mấy cục pin đồ chơi trẻ con ấy có hiệu điện thế 1.5 v và cường độ bao nhiêu...
Anh chỉ hỏi là có thể có tồn tại cục pịn như điều kiện anh muốn hỏi không ? c:big_smile:
Anh hỏi có hay ko thì em trả lời ko.Chấm.

[voimonster]

Anh hỏi có hay ko thì em trả lời ko.Chấm.

Híc cái mà anh muốn là giải thích nó cơ ! c:big_smile: c:big_smile:

[atlantic_fly]

Có 2 vật nặng và nhẹ thả rơi tự do từ cùng 1 độ cao ,hỏi vật nào chạm đất trước !

[mimosa_qn9]

2 vật cùng hình dạng, cùng kích thước hả?
Nếu trong chân ko thì như nhau, còn trog khôg khí thì vật nặng rơj xuống trc.

[atlantic_fly]

Ờ thì cho là trong chân không !
Nhưng trong không khí chưa hẳn vật nặng đã xuống trước đâu Mi !

[mimosa_qn9]

Nếu cùng hình dạng, kích thước thì trog khôg khí vật nặng rơi xuống trước chứ? Bề mặt tiếp xúc với không khí là như nhau mà?
Còn trong chân ko thì hòn đá hay vụn giấy đều rơi như nhau, đúng không? Ok?

[thanhkhoeo]

Có 2 vật nặng và nhẹ thả rơi tự do từ cùng 1 độ cao ,hỏi vật nào chạm đất trước !

Còn tuỳ theo lực cảncủa không khí thế nào 1 tờ giấy nặng 1g vẫn rơi chậm hơn hờn bi nặng 0.9ga mà

[Braveheart7472]

Nếu cả 2 vật rơi tự do thì sẽ chạm đất cùng lúc,vấn đề ở đây là:như thế nào là rơi tự do
--->Rơi tự do là quá trình vật rơi mà trong đó,ngoại lực(lực cản ko khí,gió,...) rất nhỏ so với trọng lực.
- Với vật nặng,ta có trọng lực rất lớn so với ngoại lực,do đó có thể coi là vật nặng rơi tự do.
- Với vật nhẹ,ta có trọng lực lớn(vừa phải =))) so với ngoại lực, do đó vật nhẹ không rơi tự do.
Kết luận:Nếu rơi từ vị trí thấp:có thể coi(gần đúng) 2 vật chạm đất cùng lúc.
Nếu rơi từ vị trí cao: vật nặng chạm đất trước vật nhẹ.

[n0l0v3_n0thing]

vật nào được thả trước thì chạm đất trước.c:big_smile:

[atlantic_fly]

Nguồn vật lí và tuổi trẻ !

[xoxodetoan]

Cho mình hỏi một câu khá đơn giản thôi, nhưng chẳng biết sao mà làm không ra.
Một ôtô nửa quảng đường đầu đi với vận tốc 50km/h, nửa quảng đường sau đi với vận tốc 60km/h. Hỏi vận tốc trung bình của ôtô ?
Giải xong làm ơn cho công thức tổng quát luôn nhé ! c:big_smile:

[Braveheart7472]

Công thức tổng quát tính vận tốc trung bình là:
\frac{tổng s}{tổng t}
Σt ở đây bằng \frac{s/2}{50}+ \frac{s/2}{60}
=> vận tốc trung bình : \frac{2.2.50.60}{2.50+2.60}=54,54.
Công thức tổng quát \frac{4.v1.v2}{2.v1+2.v2}


Em xin phản đối kết quả của anh Dương,theo anh thì vật nào rơi trước sẽ chạm đất trước.
Giả sử 2 tay ta cầm 2 vật(1 tờ giấy vo tròn và 1 hòn đá),đứng trên đỉnh tháp nghiêng Pizza. Ta thả giấy xuống trước,10s sau thả hòn đá.Liệu anh có dám chắc là tờ giấy sẽ rơi trước ko?
Chúng ta xét trên điều kiện thực tế là có sức cản của ko khí,có gió thổi,....nói chung là các ngọai lực.

[atlantic_fly]

Ờ thì cho là trong chân không !
Nhưng trong không khí chưa hẳn vật nặng đã xuống trước đâu Mi !
Biết bật là tốt ,phát huy !:yes:

[Braveheart7472]

Mình có 1 câu hỏi muốn đố các bạn.
1 tia sáng chiếu từ dưới nước lên trên ko khí với góc tới bằng góc i giới hạn sẽ xảy ra hiện tượng gì.

[Braveheart7472]

Bạn đã bao giờ tự hỏi rằng tại sao:
- áp suất kí hiệu là p
- lực kí hiệu là F
- thể tích kí hiệu là V
- điện dung kí hiệu là C
- điện trở kí hiệu là R
- cường độ dòng điện kí hiệu là I
....chưa???
Hãy nói lên suy nghĩ của bạn và kể tên thêm các đơn vị đại lượng vật lý khác và tại sao nó lại đc kí hiệu như thế.

[atlantic_fly]

Lực kí hiệu là F vì F là chữ cái đầu tiên của từ Fushia (một loài hoa đẹp ) rất hấp dẫn mình ,đặc trưng cho tính chất hấp dẫn của lực (hút hay kéo các vật )

[xoxodetoan]

Tớ nghĩ là nó sẽ vừa xảy ra khúc xạ vừa xảy ra hiện tượng phản xạ toàn phần ! c:big_smile:

[xoxodetoan]

Mình nghĩ ngoài việc tưởng nhớ đến người phát minh ra nó.
Các kí hiệu trên giống như IUPAC.
Nó giúp chúng ta dễ nhớ hơn.
Tương tự mình thấy khó hiểu sao hoá học lớp 10 kí hiệu các lớp lại bắt đầu từ : K,L,M.. mà không phải từ A,B,...
Chỉ có chúa mới biết.
Ngoài ra tại sao người ta lại lấy nước sôi và nước đóng băng để chia nhiệt độ ? Có lẻ tất cả chỉ là quy ước thôi.
Trong đó mình đoán chữ I là kí hiệu của từ intensity có nghĩa là cường độ.
Chữ p là kí hiệu pascal

[Braveheart7472]

Trong đó mình đoán chữ I là kí hiệu của từ intensity có nghĩa là cường độ.

Cái này đúng! :)


Chữ p là kí hiệu pascal
Sai rồi nè.Người ta lấy Pa(theo tên ông Pascan) làm đơn vị đo áp suất chứ chữ p ở đây ko liên quan tới tên ông Pascan.

Các bạn hãy thử suy nghĩ thêm nhé:bcs:
Xin nói thêm là IUPAC là của hóa học,ko liên quan đến Vật Lý ở đây đâu.

[Braveheart7472]

Tớ nghĩ là nó sẽ vừa xảy ra khúc xạ vừa xảy ra hiện tượng phản xạ toàn phần ! c:big_smile:
Cái này chưa đúng đâu,nói chung là thế này,1 tia sáng bị khúc xạ thì luôn luôn có 1 tia sáng nhỏ bị phản xạ.Vì vậy nên nói như bạn là chưa chính xác.

[xoxodetoan]

Vậy có khi nào 1 tia sáng bị phản xạ sẽ có 1 tia sáng nhỏ khúc xạ không Huy ?

[thanhkhoeo]

Đã gọi là phản xạ toafn phần thì sẽ không có tia khúc xạ


Còn phản xạ không toàn phần thì như truòng hợp trên

[xoxodetoan]

Cái này đúng! :)

Sai rồi nè.Người ta lấy Pa(theo tên ông Pascan) làm đơn vị đo áp suất chứ chữ p ở đây ko liên quan tới tên ông Pascan.

Các bạn hãy thử suy nghĩ thêm nhé:bcs:
Xin nói thêm là IUPAC là của hóa học,ko liên quan đến Vật Lý ở đây đâu.

Mình đã tìm nhưng chưa thấy kết quả. Cậu thử giải thích đi . c:sad:

[Braveheart7472]

Tớ giải thích 1 vài cái,cậu thử tìm hiểu tiếp nhá :)
F là viết tắt của Force: lực.
p là viết tắt của pressure:áp suất
V là viết tắt của Volume:thể tích
tiếp đi nào.....

[Braveheart7472]

Mình có 1 câu hỏi muốn đố các bạn.
1 tia sáng chiếu từ dưới nước lên trên ko khí với góc tới bằng góc i giới hạn sẽ xảy ra hiện tượng gì.
Thôi tớ trả lời luôn nhé,chiếu tia tới như thế thì tia ló sẽ đi là là mặt nước, giống kiểu chiếu tia sáng song song với mặt nước ấy.
Tiếp nhé: Đặt một chai thủy tinh nhỏ đựng nước vào trong một xoong nước nguyên chất đang đun trên ngọn lửa, sao cho chai không chạm tới đáy xoong (bằng cách treo chai vào một cái vòng sắt). Khi nước ở trong xoong sôi, nước ở trong lọ có sôi ko? Giải thích?

[thanhkhoeo]

Không vì nước trong chai không đủ 100 dộ vì thả vài hạt muối vàon nồi là sôi Câu này Dương đã nói 1 lần

[Braveheart7472]

Tiếp nhé:
Có 9 viên gạch vuông kích thước như nhau nhưng với khối lượng khác nhau(như trên hình) -được phân bố đều trên mỗi viên- đặt vừa đủ lên 1 tấm ván phẳng.
Khi để 1 cây gậy ngay tâm tấm ván và thả tay ra thì tấm ván sẽ ra sao?
http://upnhanh.sieuthinhanh.com/tmpimages/images/sieuthiNHANH2010123036352ytlmzmnhnt432966.jpeg
Mỗi con số tương ứng với giá trị khối lượng của mỗi viên(1 là 1kg)

[n0l0v3_n0thing]

Tấm ván sẽ giữ được thăng bằng trên chiếc gậy.vì mỗi số tương ứng với 1kg,tổng các hàng đều = 15 nên khi đặt chính giữa thì sẽ thăng bằng.

[Braveheart7472]

Tấm ván sẽ giữ được thăng bằng trên chiếc gậy.vì mỗi số tương ứng với 1kg,tổng các số bên ngoài đều = 15.
:-/Tông các số bên ngoài đều bằng 15 thì sao???Em giải thích vậy là chưa đc rồi. Hãy nhớ đến tính chất của trọng tâm của vật rắn(học ở lớp 10)

[Smileeeee]

Vì tổng các số theo hàng ngang, dọc, chéo dều là 15 nên trọng tâm của ván trùng tâm của ván. Cái cột để thẳng đứng nên đường thẳng vuông góc từ trọng tâm sẽ đi qua mặt chân đế => cân bằng. Như vậy đúng chưa anh ^^

[thanhkhoeo]

Vâng thưa các bạn, vì vật này có tổng hợp trọng lực đi qua mặt chân đế nên sẽ không đổnếu không có gió

[atlantic_fly]

Vậy có nghĩa là bài này đơn giản nhỉ ,các bạn thử xét kĩ lại xem !=))
Bài này có 1 cách làm gọn nhất là toạ độ hoá ,trọng tâm là G ,các vật là A,B,C,D,E,F,...
phải thoả mãn :mA.vectoGA+mB.vectoGB+mC.vectoGC +mD.vectoGD +....=vec to 0
mA ,B,C,D ....là khối lượng các vật ,điểm A,B,C,D,... là khối tâm hay trọng tâm của các vật tức là các tâm hình vuông nhỏ .
giải ra ta được toạ độ G ,nếu trùng với tâm hình vuông lớn thì nó cân bằng (nếu không có gió :)))
Anh vừa tìm ra cách giải hay cho bài này ,không cần tính toán trâu bò ,các em cứ thử làm ,bài này cũng hay đấy ,khi khác anh viết lời giải !

[Braveheart7472]

Em nghĩ là khi ta đặt đỡ tấm ván bằng 1 que thẳng,nằm ngang,trùng với đường chia đôi tấm ván,đi qua các ô 1,5,9, ta thấy tổng khối luợng 2 bên đều bằng 22,5. Tức là trọng tâm tấm ván sẽ thuộc đường này. Làm tương tự với đường chia đôi đi qua các ô 3,5,7, tổng khối lượng 2 bên đều bằng 22,5. Suy ra trọng tâm tấm ván sẽ là giao của 2 đường này, tức là tâm hình vuông.

[atlantic_fly]

Rất tốt ,đó cũng là tất cả những gì anh định nói !

[Braveheart7472]

NHƯNG...em vẫn còn 1 chút nghi vấn:-s
Làm tương tự như trên,nhưng mà đặt que thẳng trùng với đường chéo,đi qua các ô 4,5,6 hoặc 2,5,8 thì lại ko cân bằng,trái với tính chất: "Đặt vật lên đường thẳng đi qua trọng tâm của vật thì vật sẽ cân bằng".

[Smileeeee]

NHƯNG...em vẫn còn 1 chút nghi vấn:-s
Làm tương tự như trên,nhưng mà đặt que thẳng trùng với đường chéo,đi qua các ô 4,5,6 hoặc 2,5,8 thì lại ko cân bằng,trái với tính chất: "Đặt vật lên đường thẳng đi qua trọng tâm của vật thì vật sẽ cân bằng".

Đâu phải thế anh. Nếu đặt que trùng với đường chéo thì vẫn cân bằng. Anh để ý khoảng cách từ viên 8 và 2 tới cái que, từ viên 1,3 và viên 7,9 tới que thì thấy khi để que như vậy ván vẫn cân bằng:D (viên 4,5,6 đc chia đôi nên không ảnh hưởng)

[atlantic_fly]

Ý của Nguyên là dùng momen đối với trục quay là đường chéo !
Còn câu hỏi của Huy anh nghĩ em tự trả lời được ,cứ bám vào lí thuyết !

[Braveheart7472]

À ờ nhể,anh chưa xét đến khoảng cách từ giá của lực đến trục quay.Chắc là có thể kết thúc bài này đc rồi đấy nhỉ. Kết luận là trọng tâm là tâm của hình vuông nhé các bạn.Bạn nào đồng ý thì bấm thank tớ 1 phát để tớ post đề mới >:D<

[atlantic_fly]

Có 1 ông ,ông ta chỉ vào cái lốp ô tô to đùng và bảo tôi có thể bơm căng nó ,hỏi ông ta có thực hiện được điều đã nói không ,coi như ông ta có sức khoẻ vô hạn !