本题目来源于试卷: Work Energy and Power，类别为 美国物理杯赛(Physics Bowl)
[单选题]
14.31: A toy crane exerts an upward fo-on2i y80; lz(sc ufvhrce and delivers a usefu ohl 1kflwl25;n8gurw(qs vzsr4-(+ 2w 8 yrxml power output of 0.10 l-w28swlu1f;xk r ys woz(hrq4 rm8n 2v(5+gl w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?
A. 0.01 m/s
B. 0.02 m/s
C. 0.05 m/s
D. 0.20 m/s
E. 0.50 m/s
参考答案: C
本题详细解析:
暂无
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