→ catsyu:阿全你在那邊... 02/11 19:15
→ s636220:不要在那邊了...滾不出來阿 02/11 23:37
推 catsyu:阿全你翻譯一下啦@@ 懶的看英文... 02/12 19:30
推 leepei:請你翻譯！我看不懂英文物理名詞 02/12 22:19
a solid uniform disk of mass 21 kg and radius 0.85m is at rest flat on a
fractionless surface . A string is wrapping around the rim of disk and a
constant force of 30N is applied to the string .The string dose not slip on
the rim .(Icm for disk is 1/2MR^2) when the disk has moved a distance 9m
1.how fast is it moving?
(A)2.6m/s(B)5.1m/s(c)10.1m/s(d)20.4m/s(e)none of the above
2.how fast is it spinning?
(a)3.0rad/s(b)6.2rad/s(c)11.9rad/s(d)20.4rad/s(e)none of the above
3.how much string(length) has unwrapped from around the rim?
(a)4.5m(b)9m(c)18m(d)36m(e)none of the above
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