[问答题]
A uniform rod of mass M and length L can p
7s.xfa+vs5fbmn e t,7ja0h +vivot freely
jeexxs2:v 21i (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 release, 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:
ie2j1 2xxev: sSee Fig. 8–21g.]

