物理 重力與功 - 考試
By Charlotte
at 2016-06-15T15:21
at 2016-06-15T15:21
Table of Contents
下圖為96年度的台電雇員題目,請問該怎麼算呢?
我的想法是用F=ma=2*9.8*sin30뀽9.8,然後扣掉摩擦力2,所以F=7.8,W=Fd,答案算出
來是39
可是解答是49,難道摩擦力不用考慮嗎?為什麼呢?再麻煩大神解答,感謝。
http://i.imgur.com/GYt8eQq.jpg
--
我的想法是用F=ma=2*9.8*sin30뀽9.8,然後扣掉摩擦力2,所以F=7.8,W=Fd,答案算出
來是39
可是解答是49,難道摩擦力不用考慮嗎?為什麼呢?再麻煩大神解答,感謝。
http://i.imgur.com/GYt8eQq.jpg
--
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