gc textbook chapter 8 Rotational Motion (id: 0ee8a4188)

[问答题]
Two spheres look identical and have xzp6hh7 ql4 8sthe sax re5hgp0sv+s5d u:t0 g+v ft6me mass. However, one is hollow and the othexvgd+tv s6 0+r:fpst 5e5 0uhgr is solid. Describe an experiment to determine which is which.

参考答案:
The two spheres would have different rotational inertias.  The sphere that is hollow will have a larger rotational inertia than the solid sphere.  If the two spheres are allowed to roll down an incline without slipping, the sphere with the smaller moment of inertia (the solid one) will reach the bottom of the ramp first.  See question number 13 for an explanation of why this happens.


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