Engineering Mechanics - PKRB: Impulse and Momentum

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Exercise :: PKRB: Impulse and Momentum - General Questions

PKRB: Impulse and Momentum - General Questions

1.

The uniform rod AB has a weight of 3 lb and is released from rest without rotating from the position shown. As it falls, the end A strikes a hook S, which provides a permanent connection. Determine the speed at which the other end B strikes the wall at C.

Gear A has a weight of 1.5 lb, a radius of 0.2 ft, and a radius of gyration of k_{o} = 0.13ft. The coefficient of friction between the gear rack B and the horizontal surface is _{} = 0.3. If the rack has a weight of 0.8 lb and is initially sliding to the left with a velocity of (v_{B})_{2} = 8 ft/s to the left. Neglect friction between the rack and the gear and assume that the gear exerts only a horizontal force on the rack.

The 50-kg cylinder has an angular velocity of 30 rad/s when it is brought into contact with the horizontal surface at C. If the coefficient of friction is _{}_{c} = 0.2, determine how long it takes for the cylinder to stop spinning. What force is developed at the pin A during this time? The axis of the cylinder is connected to two symmetrical links. (Only AB is shown.) For the computation, neglect the weight of the links.

The uniform pole has a mass of 15 kg and falls from rest when _{} = 90° until it strikes the edge at A, _{} = 60°. If the pole then begins to pivot about this point after contact, determine the pole's angular velocity just after the impact. Assume that the pole does not slip at B as it falls until it strikes A.

The 12-kg disk has an angular velocity of = 20 rad/s. If the brake ABC is applied such that the magnitude of force P varies with time as shown, determine the time needed to stop the disk. The coefficient of friction at B is _{} = 0.4.