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Space Time & Motion A.2 Forces & Momentum (id: fe2592b42)

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admin 发表于 2024-2-9 18:41:07 | 显示全部楼层 |阅读模式
本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum,类别为 IB物理学

[单选题]
An apple falls 5 m in height le3lc l2 b2qyp-l )*nfz 7a -byjh)4ekfrop9.yw+xkm jz,m a tree. It rebounds from the ground with a quarter of its striking speed. The apple is in ck,.z yp+ wmx9jontact with the ground for approximately 0.1
s. What is an estimate of the magnitude of the average net force on the apple when it strikes the ground?

A. 100N
B. 101N
C. 102N
D. 103N


参考答案:  B


本题详细解析:


Speed of the ball v just before the hit;

mgh=12mv2

v=2gh

v10ms1

The magnitude of velocity just after the bounce back;

v=2.5ms1

The estimated mass of an apple is 0.1 kg.

Change in momentum;

Δp=p2p1

=(mv4)mv

=m5v4

=(0.1kg)((5)(2.5)4)ms1

=1.251.0×100kgms1

Duration of the collision is 0.1 s.

Force;

F=Change in MomentumTime=1.0×100kgms11s=1.0×101 N

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