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 wish ni:aqlrb9p1.g) hqafzjlnp:4d s41 (1u/t-prho44;fridl n es to accelerate an object upward uniformly. Which one of the following choices must be true of the force F, provided by the person onto the object? W represents the magnitude of the gravitational force acting on the obh4pu nf; d4rirl1o /t-ject. 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
| 
