作者chenkaihsu (Shrek)
看板Physics
标题[题目] 请问一题普物题目
时间Sun Nov 16 23:38:11 2008
[领域] 转动 (题目相关领域)
[来源] 课本 (课本习题、考古题、参考书...)
[题目]A solid uniform disk of mass 21.0 kg and radius 85.0 cm is at rest flat on a
frictionless surface. The figure (Intro 1 figure) shows a view from above.
A string is wrapped around the rim of the disk and a constant force of 35.0
N is applied to the string. The string does not slip on the rim.
When the disk has moved a distance of 5.1 , determine how fast it is moving.
[瓶颈] 我的算法是35*5.1=1/2*21V^2+1/2*IW^2
→70*5.1/15.75=v^2但答案不是这ㄍ
谁可以告诉我哪姐错了 (写写自己的想法，方便大家为你解答)
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2F：→ chenkaihsu:www.wretch.cc/album/album.php?id=chenkaihsu&book=4 11/17 00:07
4F：推 EricTao:转动的轴一定是质心吗? 11/17 00:47
5F：→ a80481ivan:你的W代什麽?不是纯滚动 W跟V没有关系 11/17 01:19
6F：→ SmArTyau:就你的式子算出的应该会是70*5/26.25=v^2 吧? 11/17 03:35
7F：→ SmArTyau: ^更正为5.1 11/17 03:39
8F：→ positron:不是纯滚动~ 11/18 00:42