[问答题]
A uniform rod of mass M and length
5zki- ze9(rv;be7 mjvL can
5k7uwxeplo hr),;+ zo pivot freely (i.e., we ignore friction) about a hinge attached to a wall, as in Fig. 8–54. The rod is held horizontally and then released. At the moment of re
we,;7 uolxpko)z h r+5lease, determine (a) the angular acceleration of the rod, and (b) the linear acceleration of the tip of the rod. Assume that the force of gravity acts at the center of mass of the rod, as shown. [Hint: See Fig. 8–21g.]

