题库网 (tiku.one)

 找回密码
 立即注册

手机扫一扫,访问本页面

开启左侧

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

[复制链接]
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 from a tree.qba i,23q(q2c9tdi r9o/ox :pjly.v n It rebounds from the)jpd1 pwh*bl 2d*xz1s ground with a quarter of its striking 1hl jd*p*dbzw2 sx)p1 speed. The apple is in contact 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. $10^0$N
B. $10^1$N
C. $10^2$N
D. $10^3$N


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

微信扫一扫,分享更方便

帖子地址: 

回复

使用道具 举报

您需要登录后才可以回帖 登录 | 立即注册

本版积分规则

浏览记录|使用帮助|手机版|切到手机版|题库网 (https://tiku.one)

GMT+8, 2024-7-9 03:24 , Processed in 0.066748 second(s), 28 queries , Redis On.

搜索
快速回复 返回顶部 返回列表