作者chenkaihsu (Shrek)
看板Physics
標題[題目] 請問一題普物題目
時間Sun Nov 16 23:38:11 2008
[領域] 轉動 (題目相關領域)
[來源] 課本 (課本習題、考古題、參考書...)
[題目]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.
[瓶頸] 我的算法是35*5.1=1/2*21V^2+1/2*IW^2
→70*5.1/15.75=v^2但答案不是這ㄍ
誰可以告訴我哪姐錯了 (寫寫自己的想法，方便大家為你解答)
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2F：→ chenkaihsu:www.wretch.cc/album/album.php?id=chenkaihsu&book=4 11/17 00:07
4F：推 EricTao:轉動的軸一定是質心嗎? 11/17 00:47
5F：→ a80481ivan:你的W代什麼?不是純滾動 W跟V沒有關係 11/17 01:19
6F：→ SmArTyau:就你的式子算出的應該會是70*5/26.25=v^2 吧? 11/17 03:35
7F：→ SmArTyau: ^更正為5.1 11/17 03:39
8F：→ positron:不是純滾動~ 11/18 00:42