The 3-lb ball located at A is released from rest and travels down the curved path. If th...

The 3-lb ball located at A is released from rest and travels down the curved path. If the ball exerts a normal force of 5 lb on the path when it reaches point B, determine the angular momentum of the ball about the center of curvature, point O. Hint Neglect the size of the ball. The radius of curvature at point B must first be determined.