A 20-lb sphere A is held at the 68° angle shown and released. It strikes the 11-lb sphere B. The coefficient of restitution for this collision is e=0.59. Sphere B is attached to the end of a light rod that pivots freely about point O. If the spring of constant k = 95 lb/ft is initially unstretched, determine the maximum rotation angle of the light rod after impact. Answer: 0 19 68 26° 26"

The 28-lb collar A is released from rest in the position shown and slides with negligible friction up the fixed rod inclined 28° from the horizontal under the action of a constant force P = 52 lb applied to the cable. Calculate the required stiffness k of the spring so that its maximum deflection equals 6 in. The position of the small pulley at B is fixed. P B 28" 28° 6" Answer: k = i 35" lb/ft k

The mass center, G, of the 2-lb ball has a velocity of (vd - 5 ft/s when it strikes the end of the smooth 4-lb slender bar, which is at rest. The bar has a length l-Sft. The coefficient of restitution is e-0.8. The goal is to find the angular velocity of the bar after impact. Steo 5: Finally find the angular velocity of the bar after impact in rad/s. Give your answer with 2 decimal places

The 0.7 lblb ball is shot from the spring device shown Determine the smallest stiffness k which is required to shoot the ball a maximum distance of 31 in. up the smooth plane after the spring is pushed back 3 in . and the ball is released from rest. The four cords C and plate P keep the spring compressed 2 in. when no load is on the plate.