7.28) a couple of the points need checking from Example 7.6 (page 260 ). (a)
From the point of view of a noninertial frame rotating with the hoop, the bead is subject to the forces of gravity and a centrifugal force
(in addition to the constraint force, which is the normal force of the wire).Verify that at the equilibrium points given by (7.71), the tangential components of these two forces balance one anoter.(A free-body diagram wil help.)(b)
Verify that the equilibrium point at the top
Verify that the equilibrium at the second point given by (7.71) (the one on the left,with
negative) is stable.