本题目来源于试卷: gc physics textbook chapter 6 problems，类别为 通用国际物理
[问答题]
A woman swimming upstream is not moving 2 wm9 usgurr9+ex2e.m with respect to the shormb*n t3+j4a.n/ dc okxe. Is she doing any work? If she stops swimming and /cmo +k*a.4jnbtn d3x merely floats, is work done on her?
参考答案:
The woman does work by moving the water with her hands and feet, because she must exert a force to move the water some distance. As she stops swimming and begins to float in the current, the current does work on her because she gains kinetic energy. Once she is floating the same speed as the water, her kinetic energy does not change, and so no net work is being done on her.
本题详细解析:
暂无
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