17-55. The 100-kg uniform crate C rests on the elevator floor where the coefficient of static friction is u, = 0.4. Determine the largest initial angular acceleration a, starting from rest at 0 = 90°, without causing the crate to slip. No tipping occurs. 0.6 m- 1.2 m 1.5 m 1.5 m

The uniform slender rod has a mass T7. Part A If it is released from rest when 0 = 0°, determine the magnitude of the reactive force exerted on it by pin B when 0 = 90°. Express your answer in terms of some or all of the variables m, L and standard gravity g. ANSWER: Fy =

2. The 150-1b man lies against the cushion for which the coefficient of static friction is µ̟ = 0.5. If he rotates about the z axis with a constant speed of v = smallest angle 0 of the cushion at which he will begin to slip off. 30 ft/s, determine the -8 ft Figure: 13 PO63-064

The homogeneous cylinder A has a mass of 80 kg, and the mss of the hub can be neglected. The magnitude of the variable force P, is in newtons when t is in sec- onds. The velocity of body B changes from 2 m/s downward when t = 0 to 4 m/s downward t = 5 s. Determine the mass of B. Solve all questions using Impulse and Momentum methods