查看完整版本 : [求救]唔識做有關completely inelastic momentum既問題

halo18 2013-10-16 11:08 AM

[求救]唔識做有關completely inelastic momentum既問題

A bullet of mass m  is fired into a block of mass M  that is at rest. The block, with the bullet embedded, slides distance d  across a horizontal surface. The coefficient of kinetic friction is μ k  .

Part A:
Find an expression for the bullet's speed v bullet  .
Express your answer in terms of the variables m , M , μ k  , d , and appropriate constants.

↗亢龍無悔↙ 2013-10-16 01:11 PM

首先,momentum 一定conserve,個topic已經誤導左人,呢到唔conserve 嘅係energy

List all equations you have
Initial momentum = final momentum
KE = WD = F s
F = normal reaction x coefficient

You will get your answer
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[[i] 本帖最後由 ↗亢龍無悔↙ 於 2013-10-16 01:14 PM 使用[url=http://www.discuss.com.hk/android][img=100,23]http://i.discuss.com.hk/d/images/r10/androidD.jpg [/img][/url] 編輯 [/i]]

halo18 2013-10-17 09:33 AM

Thank you very much, bro!:loveliness:
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