[Lý] Cơ học cổ điển

[atlantic_fly]

Cái nầy có trên olimpia rùi mà Lâm ,ra vài câu đố tớ đi ,dạo này chán quá !

[ܓܨOrion.p0n]

chuyển câu trên sang vật lí vui nhá ... Phần này thuộc khu vực câu hỏi liên quan đến cơ học
Tiện thể hỏi một câu liên quan đến phần này một chút hehe
Con mèo rơi từ bất cứ một tư thế nào, ngửa, nghiêng hay chân sau xuống trước, vẫn tiếp đất nhẹ nhàng bằng 4 chân. Chắc chắn khi rơi không một ngoại lực nòa tạo ra một biến đổi momen động lượng. Hãy thử xem bằng cách nào mèo thay đổi tư thế của mình và giải thích.
Để tiện thêm tớ để bạn dương cùng suy nghĩ về bài tập này :)
và đương nhiên ...
nhớ thank đấy c:hell_boy:

[thanhkhoeo]

giải thíck hộ mình tại sao trong tâm bão lại " trời yên biển lặng"

[atlantic_fly]

Câu con mèo :
Theo mình con mèo sẽ có 1 tư thế mà trọng lượng tập trung ở phần bụng ,khi rơi với bất kì 1 vị trí nào mà bụng không hướng xuống dưới hoặc không hướng lên trên cũng sẽ tạo ra mo men quay .
Ta thấy có 2 vị trí cân bằng là bụng hướng xuống dưới đất và hướng lên trên trời ,nhưng bụng hướng lên trời là vị trí cân bằng không bền ,bụng xuống dưới đất là vị trí cân bằng bền
Đó là lí do vì sao chân luôn tiếp đất trước.

[ܓܨOrion.p0n]

Giải thích được, tuy nhiên cái tớ cần là nó làm thể nào để thay đổi tư thế của mình
đừng thả mèo thật đấy nhá c:haha:

[atlantic_fly]

Co dúm người lại cho cái lưng nhô lên cao.
Câu của Thành cũng hay đấy ,mình đoán có lẽ liên quan đến v=wr ,có lẽ phải tìm hiểu thêm.

[yukiPro1011]

Thì lí do tại xương nó linh hoạt khj ngã nó quay người cho 4 chân tiếp đất trước .

còn 4 chân mèo thì ai cũng biết có đệm thịt nên k lo đau

[ܓܨOrion.p0n]

Đó là vặn mình bằng cách xoắn sương sống :)). tuy nhiên thì cách giải thích của dương là hoàn toàn đúng... thank cho bạn hiền nè c:haha:

[ܓܨOrion.p0n]

Khi hòn đá rơi trong không khí từ một nơi cao xuống, liệu nó có tăng mãi vận tốc không?
mời mọi người xơi c:nosebleed:

[atlantic_fly]

nếu tăng mãi thì hạt mưa rơi vỡ đầu người c:big_smile:c:big_smile:c:big_smile:

[minh_hg]

tăng làm sao đc mãi, đến lúc nào đó lực cản của ko khí sẽ cân = vs trọng lực và khi đó vật sẽ rơi với vận tốc ko đổi

[ܓܨOrion.p0n]

chính xác
Ban đầu thì vận tốc tăng dần cho đến khi lực cản không khí cân bằng với trọng lực thì vận tốc không tăng nữa.
Một câu nữa nè :)
Nếu thân thể bạn mất trọng lượng nhưng quần áo vẫn nặng như bình thường thì bạn vẫn ở trên mặt đất được hay bị bay bổng lên cao?

[yukiPro1011]

Điều này em cũng đc nghe qua>.<
...........................................
Nhưng không rõ là rơi đến mức độ nào thì nó sẽ giảm vận tốc đây

Trả lời :
Được , vì bình thường quần áo nó có bao giờ bay lên trời đâu+
Không biết giải thích gì thêm
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

[ܓܨOrion.p0n]

Điều này em cũng đc nghe qua>.<
...........................................
Nhưng không rõ là rơi đến mức độ nào thì nó sẽ giảm vận tốc đây

Trả lời :
Được , vì bình thường quần áo nó có bao giờ bay lên trời đâu+
Không biết giải thích gì thêm
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

trả lời đóa hả ..được cái gì chứ c:matrix: .

[atlantic_fly]

Câu vật rơi trong khí quyển ,nếu mà đi sâu thì cũng không phải dễ đâu ,trong trường hợp vật chuyển động với vận tốc nhỏ ,chỉ tính lực cản trên bề mặt vật với dòng không khí thì lực cản tỉ lệ bậc nhất với vận tốc ,còn vận tốc lớn ,lực cản trược diện thì lực cản tỉ lệ với bình phương vận tốc ,bạn nào có hứng thì chứng minh nhé !

[ܓܨOrion.p0n]

Câu vật rơi trong khí quyển ,nếu mà đi sâu thì cũng không phải dễ đâu ,trong trường hợp vật chuyển động với vận tốc nhỏ ,chỉ tính lực cản trên bề mặt vật với dòng không khí thì lực cản tỉ lệ bậc nhất với vận tốc ,còn vận tốc lớn ,lực cản trược diện thì lực cản tỉ lệ với bình phương vận tốc ,bạn nào có hứng thì chứng minh nhé !

chờ nhân tài lớp 10 làm đây c:big_smile:... Không làm được thì chờ dương giải thôi :nosebleed:

[Braveheart7472]

Hồi nhỏ , tớ có cái thắc mắc rất chy là buồn cười như thế này:Ta biết rằng Khi Trái đất quay quanh Mặt trời thì đồng thời nó cũng tự quay xung quanh trục của nó nữa.Thế nếu ta muốn đi từ nơi này tới nơi khác ta phải lên khí cầu và bay đi. Tại sao ta không thể bay lên và đứng im một chỗ thôi, trái đất quay quanh nó thì ta sẽ hiển nhiên đi từ nơi này sang nơi khác? Vì sao lại thế nhỉ?:D
Em nghĩ chị nên đọc sách nhiều hơn, câu này trong quyển vật lý vui có nè. Khi trái đất tự quay quanh mình, do lực hút nó gây ra nên mọi thứ trong trường lực cuả nó sẽ quay theo, kể cả ko khí, tức là cái khí cầu đó cũng quay theo. Nều chị muốn du lịch kiểu đứng yên 1 chỗ thì chị hãy bay ra ngoài lực hút cuả trái đất, tức là bay trên tầng khí quyển, đến lúc đó thì chị cứ việc đứng yên 1 chỗ mà ngắm trái đất từ ngoài vũ trụ.

[voimonster]

Có một điều trong cơ học em không tài nào hiểu nổi
Đó là tại sao các vật hút nhau nhỉ ?
c:big_smile: 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[Braveheart7472]

Có một điều trong cơ học em không tài nào hiểu nổi
Đó là tại sao các vật hút nhau nhỉ ?
c:big_smile:
Thế em đã học định luật vạn vật hấp dẫn trog chương trình lớp 10 chưa ?

[voimonster]

Híc!
Đó chỉ là nêu lên quy luật hấp dẫn của vạt vật!
Chứ không giải thích vì sao nó hấp dẫn ? 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[minh_hg]

Nếu chưa muốn bị ban nick thì dừng cái trò spam này lại đi em.
Cái kiểu mỗi chỗ chõ vào 1 tí này ko ai ưa đâu

[voimonster]

Em xin lỗi ! Em cần phải viết đủ 20 bài để gửi chủ đề mới lên!
Sorry
c:beat_shot: 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[voimonster]

Em cũng muốn đợi 7 ngày lắm!
Nhưng em cần tạo một chủ đề mới bên đoàn !
Và cần gấp nên không đợi được!c:doubt: 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[minh_hg]

@voimonster: haizz doạ em tí thôi chứ thấy tình cảnh đáng thương, thôi thì spam cho tử tế và có chất lượng, đừng có nói lung tung vô nghĩa là đc.
@babe: "iêm rể" tê nứ, khiếp, bọn này tẩm ngảm tầm ngầm sợ thật c:nosebleed:
Cô cũng spamko ít đâu cô babe ạ c:spiderman:

[atlantic_fly]

Đúng là đôi khi em nó có spam nhưng phải thừa nhận hội mình chưa có ai đủ trình độ để trả lời những câu hỏi đụng đến gốc rễ vấn đề như câu ấy .

[thanhkhoeo]

Em cũng muốn đợi 7 ngày lắm!
Nhưng em cần tạo một chủ đề mới bên đoàn !
Và cần gấp nên không đợi được!c:doubt:

spam 25 bài à đc mà viết nhật kí online áy c:ah:c:big_smile:

[atlantic_fly]

Tặng câu này cho Huy :
Giải thích cơ chế bay để lơ lửng được trên không trung của máy bay trực thăng .
Lâu nay chưa có câu nào có lẽ các vị hơi ngứa ngáy chân tay

[thanhkhoeo]

lực đẩy acsimet + lực đẩy của cánh quạt cân = với trọng lực đúng không nhỉ

[atlantic_fly]

Cái chính vẫn là lực đẩy đặt lên cánh quạt nhưng Thanh nói vậy chưa đủ ,lực đẩy acsimet hầu như người ta không tính đến trong cơ chế của máy bay .

[Braveheart7472]

Cũng như máy bay thường, các cánh quạt của máy bay trực thăng cũng có nguyên lý hoạt động như cánh của máy bay bình thường.Tức là mặt trên cong, mặt dưới phẳng, do có sự chênh lẹch áp suất nên đã tạo ra lực nâng máy bay. Các cánh của MBTT tuy nhỏ hơn nhưng có nhiều cánh hơn so với máy bay thường, tuy vậy hiệu suất của MBTT vẫn nhỏ hơn so với máy bay thường.

[atlantic_fly]

Chưa kĩ ,do đâu mà có sự chênh lệch áp suất giữa mặt trên và mặt dưới ,chênh lệch thế nào .

[thanhkhoeo]

vận tốc gió ở dưới thấp hơn gây nên chênh lệch áp suất tĩnh

[atlantic_fly]

Tại sao vận tốc của gió ở dưới lại thấp ?

[thanhkhoeo]

cấu tạo của cánh máy bay phồng trên lõm dưới

[atlantic_fly]

Tại sao bên trên phồng lên lại làm cho vận tốc gió cao hơn ?

[Braveheart7472]

HAHA, cứ như là đối mặt ấy nhỉ.
Do mặt trên cánh quạt phồng nên quãng đường dài hơn => vận tốc gió sẽ nhanh hơn => chênh lệch áp suất => lực nâng máy bayc:look_down:

[atlantic_fly]

Tại sao bê một vật đứng yên ,rõ ràng độ cao không thay đổi ,vật không được nhận công mà ta vẫn mệt ,không thể bê mãi mãi được ?
Tại sao máy bay trực thăng lơ lửng trên không ,rõ ràng độ cao của nó không thay đổi ,không nhận được công mà xăng vẫn cạn dần ?

[thanhkhoeo]

Tuy khong sinh công nhưng vẫn phải có lực để cân bằng vs trọng lực thế thôi

[atlantic_fly]

A=F*s ,trong trường hợp này s=0

[Braveheart7472]

Khi vật đang ở trên ko, vật cân bằng, lực kéo của tay cân bằng với trọng lực. Lực này ko sinh công nhưng có tác dụng giữ cho vật cân bằng, tay ta vẫn mỏi vì các cơ của ta đang tạo ra 1 lực kéo.

[thanhkhoeo]

tôi nói thế mà huy . nói lại à ông

[atlantic_fly]

Câu trực thăng mình đã có lời giải thích thoả đáng ,Huy hãy suy nghĩ kĩ rồi đưa ra câu trả lời ,dựa vào cơ chế hoạt động của trực thăng .
Còn câu người vác vật nặng thì nó là 1 câu sinh lí kết hợp ,phải tham khảo ý kiến của anh Kẹo !

[Candy]

Tại sao bê một vật đứng yên ,rõ ràng độ cao không thay đổi ,vật không được nhận công mà ta vẫn mệt ,không thể bê mãi mãi được ?


cái này á. khi ta bê vật thì duới tác dụng của trọng lực, vật có xu hướng rơi xuống dưới. còn ta thì ta bê vật đó, tức là đã dùng lực của chúng ta để thắng trọng lực. mà chúng ta dùng lực tức là đã tiêu tốn năng lượng. và từ đó sinh ra tích tụ axit lactic trong cơ, dẫn đến sau 1 thời gian thì mệt. Nhưng để ý nhé, các vđv thể thao, tại sao họ lại có thể chơi với cường độ lớn như vậy? bởi vì họ đã đốt được 1 lượng nhỏ axit lactic nên họ ko mau mệt bằng chúng ta. điều này thì hiện nay các nhà khoa học giải thích vẫn vòng vo lắm nên a cũng ko đưa ra làm j ;))

[atlantic_fly]

Vậy thì kết luận rằng :con người cứ tác dụng lực là tiêu tốn năng lượng phải không anh ,cái này bên sinh ,em suy nghĩ cũng lâu mà chưa thông!

[Candy]

Cứ dùng lực là tiêu tốn năng lượng. Bất kể vật gì cũng thế, không phải chỉ riêng con người :)

[voimonster]

Giải hộ em bài này: một quả mìn nặng 500g hỏi cần phải ném với một lực bao nhiêu để nó bay được 30m. Cho góc độ ném là 45 độ (Học quốc phòng thằng bạn nó đố,ko giải được.) c:big_smile: 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http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/

[van_anh_hoa]

Ban đầu cần phải cung cấp cho vật một vận tốc bằng cách tác dụng lực trong một thời gian t .
Với các thời gian t khác nhau thì lực tác dụng khác nhau nên phải chăng câu hỏi của người bạn ấy là vô nghĩa !

[voimonster]

Nếu không cho thời gian có thế tính động năng cần cung cấp không ? Trong trường hợp thời gian là 0.5s thì lực cần bằng ?c:adore:http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/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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[van_anh_hoa]

Cái này cũng không phải là phức tạp gì ,bạn tính v để đi được 30m ra ,cái này phần chuyển động ném xiên có rồi chứ .
Coi như phương của lực phát động trùng với phương của vận tốc ,lực phát động là tổng hợp của trọng lực và lực cánh tay
Và cuối cùng :v=at

[Braveheart7472]

Cái này cũng không phải là phức tạp gì ,bạn tính v để đi được 30m ra ,cái này phần chuyển động ném xiên có rồi chứ .
Coi như phương của lực phát động trùng với phương của vận tốc ,lực phát động là tổng hợp của trọng lực và lực cánh tay
Và cuối cùng :v=at
Đúng rồi,mấy cái này đã có ở lớp 10,bạn cứ thay vào công thức là xong thôi.

[voimonster]

V=at vậy lấy a và t ở đâu. Làm ơn nói luôn kết quả giùm 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[van_anh_hoa]

Cái này bạn phải tự tính đi chứ ,con đường mình đã nêu ,cứ thế mà làm !
Bằng tuổi nhau cả ,em cái gì !

[voimonster]

Híc c:nosebleed: Sao bạn nóng vậy chứ. Nhưng dù sao cũng cảm ơn bạn. Mình tìm được đáp án rồi. c:big_smile: 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[van_anh_hoa]

Mình có nóng gì đâu !
Chỉ là chỉ muốn bạn tự làm cho nhớ thêm được gì thì nhớ thôi ,mạo muội đố các bạn Đào Duy Từ :
Một quả bóng nhỏ, đàn hồi bị rớt theo phương thẳng đứng lên một mặt phẳng nghiêng góc α so với mặt phẳng ngang. Đúng hay sai nếu nói khoảng cách giữa hai điểm nảy lên liên tiếp tăng theo cấp số cộng . Giả thiết rằng va chạm là hoàn toàn đàn hồi và có thể bổ qua sức cản của không khí .

[voimonster]

Đúng nếu nói khoảng cách giữa hai điểm nảy lên liên tiếp tăng theo cấp số cộng.
(Đơn giản nếu nó sai thì đố chả có nghĩa lí gì) 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[Braveheart7472]

Chứng minh điều này đã có trong sgk lý lớp 10 rồi bạn ạ.

[van_anh_hoa]

Đúng hay sai phiền các bạn trình bày rõ ,các bạn pro quá !

[Braveheart7472]

Mình đang bận nên hạn hẹp thời gian, bạn có thể giở SGK lý 10 trang 34. Thứ lỗi nhé.c:smile:

[van_anh_hoa]

Hi Hi Bài đó là vật chuyển động nhanh dần đều và quãng đường thực hiện trong những khoảng thời gian như nhau còn bài của mình thì khác ,vật va chạm với mặt phẳng nghiêng góc anpha cơ mà !
He !Nhiều lúc bôi đen một khoảng trắng lại thấy một điều thú vị !

[Braveheart7472]

Suỵt suỵt,bí mật.
Xin lỗi nhé để mình xem lại................................c:smile:

[van_anh_hoa]

Bài đó thế nào ,ra chưa Braveheart7472 ,nghe nói hội vật lí các cậu khủng lắm cơ mà !c:look_down:

[voimonster]

Hình như hội vật lí dạo này làm việc không tích cực như đợt trước ! 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c:cool:

[thanhkhoeo]

Tất cả là vì vắng mặt hội truởng (alantic_fly) nên 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[voimonster]

Hội trưởng bị sao à? c:adore: 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[Braveheart7472]

Sao à bạn, mọi người đang tập trung ôn tập để thi học kì...Tại sao bạn ko vào topic vật lý đề bài (http://daoduytu.edu.vn/forum/showthread.php?t=12819) làm vài bài lý nhỉ?c:misdoubt:

[voimonster]

Sao à bạn, mọi người đang tập trung ôn tập để thi học kì...Tại sao bạn ko vào topic vật lý đề bài (http://daoduytu.edu.vn/forum/showthread.php?t=12819) làm vài bài lý nhỉ?c:misdoubt:

Năm nay học kì thi tự luận. Híc ! Mình không biết làm tự luận. Có cách nào để chuyển từ học trắc nghiệm sang tự luận không ta ? 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[atlantic_fly]

Bài đó ở trong 200 problum ,hay trong bộ đề 30/4 cũng có ,Huy làm ra chưa không thì để anh làm !

[Braveheart7472]

Thôi em "nhường" cho anhc:smile:...........

[minh_hg]

@ van_anh_hoa: à hội vật lí bọn anh bt thôi, chỉ là những người thích môn lí, thích tìm tòi, làm sao khủng = dân chuyên ăn lí ngủ lí đc c:hungry:
@ thành: Dương nó lớp 12 rồi, bân lắm chứ, làm sao suốt ngày cắm đầu trên này đc
Haizzz anh thì đang chết dở sống dở vs cái môn lí sinh đây, 8 ngày nữa thi rồi mà h chữ nghĩa cứ ong ong, ngồi trên giảng đg nghe thì buồn ngủ chết đi đc :nosebleed:, về nhà thì 1 mớ công thức thừa nhận ( ko chứng minh đc ) nhớ đc cái nọ quên cái kia c:cry:

[Braveheart7472]

Giá mà tất cả các công thức ta đều có thể chứng minh thì sẽ rất dễ nhớ, dễ hiểu, dễ vận dụng..........c:smile:

[atlantic_fly]

Nhớ công thức bằng cách chứng minh rất có lợi ,nhớ được lâu mà hiểu rõ vấn đề ,mình cũng toàn nhớ bằng cách đó chỉ có điều lúc nào cần thì mất công chứng minh lại hơi tốn thời gian !

[van_anh_hoa]

Có lẽ em nói năng hơi quá ,nhưng em chỉ muốn khích tướng để mọi người nhiệt tình hơn thôi !

[voimonster]

Anh ơi giải hộ em mấy bài trước đi ? c:adore:http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/images/scared%20of%20santa/http://photobucket.com/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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[van_anh_hoa]

Bạn cần bài nào ,có thể mình giúp được đấy !

[Braveheart7472]

Mình xin trình bày bài giải như sau bạn van_anh_hoa nhé:
http://farm2.anhso.net/pic/o/109694/4E3E838FF3233842FF484D32434AA92E7BED63BCAD730E2A/3.jpactions=o
Khi vật rơi trên mặt phẳng nghiêng, gọi độ cao ban đầu của vật là h(như hình vẽ), góc ngiêng α...
Chọn hệ trục như hình vẽ
Phân tích gia tốc trọng trường thành 2 thành phần:
_ Phần g_2 có tác dụng làm vật rơi xuống và nẩy lên với độ cao ko đổi, khoảng thời gian giữa 2 lần va chạm liên tiếp là ko đổi và bằng 2\sqrt{2h/g}.
_ Phần g_1 có tác dụng làm vật chuyển động nhanh dần đều theo phương ngang với gia tốc gsinα. Người ta đã chứng minh đc rằng vật chuyển động nhanh dần đều có độ dời trong những khoảng thời gian bằng nhau liên tiếp là 1 dãy cấp số cộng (trong sgk Lý lớp 10 cũng đã chứng minh). Vì vậy
khoảng cách giữa hai điểm nảy lên liên tiếp tăng theo cấp số cộng

[van_anh_hoa]

_ Phần g_2 có tác dụng làm vật rơi xuống và nẩy lên với độ cao ko đổi, khoảng thời gian giữa 2 lần va chạm liên tiếp là ko đổi và bằng \sqrt{2h/g}.

Bạn xem lại chỗ này !

[Braveheart7472]

Bạn xem lại chỗ này !
Nhầm tí, đã sửa lại.c:smile:

[van_anh_hoa]

Hừ! vẫn chưa đúng ,đi thi đâu cho phép những sai lầm như vậy hả bạn !

[voimonster]

Hỏi vui một tí. Tương tác giữa ánh sáng với gương và bị phản chiếu lại là tương tác gì 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%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[kutie.love]

Bài của Braveheart7472 sai chỗ nào thế hả bạn ?

Hừ! vẫn chưa đúng ,đi thi đâu cho phép những sai lầm như vậy hả bạn !

Con gái LS khiếp thật , sai tí mà cứ hừ hừ như thể là...:))

[atlantic_fly]

Mục tiêu mà Huy đang hướng tới không cho phép những sai lầm như vậy ,mình cũng đã từng mắc những sai lầm ấy ,minhf nhận thấy chỉ có chính xác gần như tuyệt đối những bài vừa sức và một chút may mắn mới có thể thành công được !

[CAPTAIN]

Dại gái vừa thôi bạn ạ , sai chỗ nào thì chỉ cho bạn , không thì thôi, lại còn bày đặt , nói thật là mình cũng không hiểu bạn Braveheart7472 sai chỗ nào cả???

[atlantic_fly]

Cám ơn bạn đã đóng góp ý kiến ,mình không am hiểu về bóng đá cho lắm ,trước khi xem trận chung kết mùa trước giữa Bacsar và Inter ,mình mạnh mồm bảo :'' cái thằng In ter thì đá đấm cái gì !'' Xem xong mình hiểu những kẻ không biết gì thì không nên phát ngôn bừa bãi ,hình như nay mình đã sửa được tật ấy !
Bạn hiểu ý mình chứ !
Cô bạn Vãn Anh hoa của mình xinh gái lắm ,không dại gái sao được c:big_smile:!

[atlantic_fly]

Vì cái tật suy nghĩ không đến nơi đến chốn mà mình đã nghĩ sai cho Huy và bạn gì đó bên trên ấy nhỉ ,xin lỗi các bạn ,lần sau mình sẽ rút kinh nghiệm khi nhìn nhận một vấn đề .
Mình đã tham khảo ý kiến của Vãn Anh hoa ,bạn ấy đã thóng nhất Huy làm đúng !

[thanhkhoeo]

c:beat_brick:c:beat_brick:
Cám ơn bạn đã đóng góp ý kiến ,mình không am hiểu về bóng đá cho lắm ,trước khi xem trận chung kết mùa trước giữa Bacsar và Inter ,mình mạnh mồm bảo :'' cái thằng In ter thì đá đấm cái gì !'' Xem xong mình hiểu những kẻ không biết gì thì không nên phát ngôn bừa bãi ,hình như nay mình đã sửa được tật ấy !
Bạn hiểu ý mình chứ !
Cô bạn Vãn Anh hoa của mình xinh gái lắm ,không dại gái sao được c:big_smile:!

Thafnh thấy rằng Dương đừng nên nói về bóng đá nữa khê lắm 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+ barca không phải bacsar
+ barca gặp inter ở bán kết không phải chung kết

Xem xong mình hiểu những kẻ không biết gì thì không nên phát ngôn bừa bãi ,hình như nay mình đã sửa được tật ấy !c:beat_brick:

[voimonster]

c:beat_brick:c:beat_brick:

Thafnh thấy rằng Dương đừng nên nói về bóng đá nữa khê lắm

+ barca không phải bacsar
+ barca gặp inter ở bán kết không phải chung kết
c:beat_brick:

Ủa . Mình cứ tưởng đây là topic vật lí chứ ? Hoá ra cả đá banh nữa à ? 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[atlantic_fly]

Mấy hôm trước đầu óc không được minh mẫn cho lắm nên nói năng không chuẩn ,lâu lâu các vị mới có dịp đá xoáy tôi ,được đấy ,nhưng tôi sai thì tôi đã nhận !
Quay về chủ đề chính ,đề tuần này sao chư thấy ai giải thế !

[thanhkhoeo]

thành vs huy giải đc bài 4

còn bài 1 hình nhu sai đề 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Bài 1: Hai quả cầu nhỏ cùng khối lượng và điện tích như nhau đang ở trên cùng một phương đứng trên mặt đất .Quả cầu 1 cách đất 1m ,quả cầu 2 cách đất 1.5m.
Hai quả cầu được ném đồng thời theo phương ngang với v=4*căn(10) m/s
Khi quả cầu 1 chạm đất cách vị trí ban đầu 2m theo phương ngang thì quả cầu 2 cách đất bao nhiêu ,g=10m

khi quả cầu cách 2m thì chưa rơi xuông đất

[van_anh_hoa]

Bài này trong 30/4 ,đề cho là Khi quả cầu 1 chạm đất cách vị trí ban đầu 2m theo phương ngang chứ không phải theo phương đứng !
Mình thấy không có gì sai cả !

[thanhkhoeo]

Bài này trong 30/4 ,đề cho là Khi quả cầu 1 chạm đất cách vị trí ban đầu 2m theo phương ngang chứ không phải theo phương đứng !
Mình thấy không có gì sai cả !


khi quả cầu cách vị trí ban đầu 2m thì nods chưa chạm 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[voimonster]

khi quả cầu cách vị trí ban đầu 2m thì nods chưa chạm đất

Trời ơi là trời ? Bó tay rồi. 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[atlantic_fly]

Cách 2m theo phương ngang cơ mà Thành ,còn cái cậu nói đó là cách theo phuoiwng đứng 2m thì phải !

[voimonster]

Em phát hiện ra học lí trên hocmai.vn cũng hay lắm. Có ví dụ minh hoạ cũng như bài tập rất phong phú. 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[atlantic_fly]

Mình nhớ hồi nhỏ đã từng chơi trò này : bôi ít nước rửa bát hay xà phòng lên đằng sau của một chiếc lá cong cong hình cái thuyền ,thả xuống nước ,nó chạy ,bạn nào giải thích hộ với !

[thanhkhoeo]

do sức căng bề mặt của xà phòng tạo ra lực đẩy lá 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[atlantic_fly]

Thành nói rõ hơn được không !
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[thanhkhoeo]

nói chung à thành không giải thíck cahn kẽ đc. 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[atlantic_fly]

Ý kiến của Huy về câu hỏi này thế nào ?

[atlantic_fly]

@ Đừng xoá !
Đề bài cho khối 10.
Quả bom nguyên tử thả xuống thành phố himosima của nhật nặng 3342kg.
Quả bom này được thả với độ cao 9000m.
Bom có dạng hình tròn.
Diện tích tiếp xúc là 0.75 m bình.
Cho gia tốc bằng 10m/s bình.
Hỏi nếu qua bom không nổ nó sẽ tạo với mặt đất một áp suất bao nhiêu ?
(Cho rằng bom rơi tự do ).c:big_smile:
500 dzbank! c:big_smile:
Cám ơn Voi vì một câu hỏi rất hay ,theo mình đây là một câu hỏi mô hình
Cách 1: áp suất =F/diện tích tiếp suất
Cách 2: Coi mặt đất có hệ số đàn hồi k ,bảo toàn năng lượng ta tính được độ biến dạng đen ta x của mặt đất sau đó tính độ lớn của lực đàn hồi cực đại
áp suất=F đh max /diện tích tiếp xúc !

[Braveheart7472]

Đêf lớp 10 mà anh,sao lại làm.......