Work Energy and Power (id: 1dc64e316)

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]
10.31: An object of mass e8 u+ ,bnin1fnM starts from rest aq;pkigbaa6, vqt4/7ps a c0s *t the bottom of a fixed incline of height H. A person decides to push the object up the incline in one of two ways with an applied force shown in the diagram. In each of the trials, the object reaches the top of the incline with speed V. How would the work done by the person on the block compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction bep,qcqi0s a7ba* 4tv apg/6 s;ktween the incline and the object for both trials.

A. More work would be done in Trial 1
B. More work would be done in Trial 2
C. The work would be equal for both trials
D. It is impossible to determine for which trial there would be more work done without knowing the value of the speed.
E. It is impossible to determine for which trial there would be more work done without knowing the value of the coefficient of kinetic friction.


参考答案:  A


本题详细解析: 暂无

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