本题目来源于试卷: gc textbook chapter 8 Rotational Motion，类别为 通用国际物理
[问答题]
We claim that momentum and angular momentum are cw:drimf hgo *-1)vt0 m 5nm-daonserved. Yet most movine7kimq; p -,yj3*o: t+jg zi.0y x0 ntgfnisw-g or rotating 73 gxjji:psni0im +z , -ewk.foyg yt;-*nq0tobjects eventually slow down and stop. Explain.
参考答案:
Momentum
and angular momentum are conserved for closed systems – systems in which there
are no external forces or torques applied to the system. Probably no macroscopic systems on Earth are
truly closed, and so external forces and torques (like those applied by air
friction, for example) affect the systems over time.
本题详细解析:
暂无
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