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

[问答题]
A person stands on a platform, initially p tw616*vd+hxyw j1gpat rest, mo rvez) ,1gc;qwnd/.that can rotate freely without friction. The moment of inertia of the person plus the platform )d,m.zwog/vq c ;rn1 eis $I_P$ 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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