Chapter 15, Problem 76P

The system is released from rest in the position shown. The 15-kg cylinder falls through the hole in the support, but the 15-kg collar (shown in section) is removed from the cylinder as it hits the support. Determine the distances which the 50-kg block moves up the incline. The coefficient of kinetic fric- tion between the block and the incline is 0.30, and the mass of the pulley is negligible. 15 kg 50 kg

Fial I The figure shows a body consist of two segments which are a rod AB and a disk with weights of 4-lb and 11-lb respectively. The body is attched with a spring. The roller 1 ft k = 8 lb/ft Datum at C allows the spring to remain vertical as the rod falls. B A The length of the unstretched spring is 0.85 ft. If the body is released from rest and rotates CW about point B, 1 ft 3 ft determine the following: (Assume the datum at point B) 0.25 ft 1. The potential energy of the spring when the body is horizontal. 2. The potential energy due to gravity when the body is horizontal. 3. The potential energy of the spring when the body is vertical. 4. The potential energy due to gravity when the body is vertical. 5. The angular velocity at the instant the body becomes vertical.

The uniform 36-lb bar is released from rest in the horizontal position shown and strikes the fixed corner B at the center of percussion of the bar. Determine the t-component of the force exerted by the bearing O on the bar just prior to impact, during impact, and just after impact. The t-component is positive if it acts in the t-direction. Answers Just prior to impact: 0,= During impact: 6.9¹ Just after impact: 0₁ = Ot= i i i (OA lb lb lb