本题目来源于试卷: Typical Forces，类别为 美国物理杯赛(Physics Bowl)
[单选题]
16.10: A person wishes to ac t5dqjbes- c3b/ lpo5/c 2j 7e)8nf*w*jh*wy n5d titwdelerate an object upward uniformly. Which one of the following choices )je5w h wtn7y t8* dn2dfj*i*wmust be true of the force F, provided by the person onto the object? W represents the magnitude of the gravitational force acting on the object. Ignore any effects of the air or of the Earth’srotation.
A. $F $= W
B. $F$ ≥ W
C. $F$ > W
D. $F$ ≥ 2W
E. $F $> 2W
参考答案: C
本题详细解析:
暂无
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