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

[问答题]
A person stands on a platform, initially at rest, that cl 57 b6vr)my 2y rbrwy4gmrh31an rotate freely w9yathag *6exu6b8 +d9hgvz4s by(o g:ithout friction. The moment of inertia hdou9s4zgay 6*t gh+8b6a :y v(9 xgbeof 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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