gc physics textbook chapter 6 problems (id: 44e0cf71d)

本题目来源于试卷: gc physics textbook chapter 6 problems，类别为 IB物理学

[问答题]
A bowling ball is hung from the ceilc 5 ubtj-h-0eging by a steel w,l +oyw; yjms6gsdo- q+un*8 zire (Fig. 6–33). The instructor pulls the ball back and stands against the wall with theyqzo -8 gsl s+jn*;+d6mu,ywo ball against his nose. To avoid injury the instructor is supposed to release the ball without pushing it. Why?

参考答案:
If the instructor releases the ball without pushing it, the ball should return to exactly the same height (barring any dissipative forces) and just touch the instructor’s nose as it stops.  But if the instructor pushes the ball, giving it extra kinetic energy and hence a larger total energy, the ball will then swing to a higher point before stopping, and hit the instructor in the face when it returns.


本题详细解析: 暂无

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