gc textbook chapter 8 Rotational Motion (id: 7234fc78e)

[问答题]
A person stands on a platfod/y4jz c i4;by95qrm ,uea3j urm, initially at rest,tdr10qm9 mt :rjdw* v4 that can rotate freely without friction. The mo1vd dttj:w 0rr9 qm*m4ment of inertia of the person plus the platform is $I_P$ The person holds a spinning bicycle wheel with its axis horizontal. The wheel has moment of inertia $I_W$ and angular velocity $\omega_W$ What will be the angular velocity $\omega_W$ of the platform if the person moves the axis of the wheel so that it points (a) vertically upward, (b) at a 60º angle to the vertical, (c) vertically downward? (d) What will $\omega_P$ be if the person reaches up and stops the wheel in part (a)?

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