[问答题]
A uniform rod of mass M and length L can pivot
nj7h+4kn-z fwfreely (i.e., we ignore
.to8v,brl(rc ,jlh)lfriction) 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 ro
o,lctvl)h,b.8 ( rj rld. Assume that the force of gravity acts at the center of mass of the rod, as shown. [Hint: See Fig. 8–21g.]

