試題詳解

7. Two uniform cylinders have different masses and different rotational inertias. They simultaneously start from rest at the top of an inclined plane and roll without sliding down the plane. The cylinder that gets to the bottom first is:
(A) the one with the larger mass
(B) the one with the smaller mass
(C) the one with the larger rotational inertia
(D) the one with the smaller rotational inertia
(E) neither (they arrive together).