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 qvj4 3rb,d c+nupward foni*1kh33r-rr nyy- nbrce and delivers a useful power output of 0.10 ry yhr*-i1 nnbn3- rk3w 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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