22-51. The 40-kg block is attached to a spring having a stiffness of 800 N/m. A force F = (100 cos 21) N, where t is in seconds is applied to the block. Determine the maximum speed of the block for the steady-state vibration. -k = 800 N/m F= (100 cos 2r) N

The springs BA and BC each have the same stiffness k and unstretched length of 3 m. Determine the displacement d of the cord from the wall when a force of F is applied to the cords. F=229 N k=445 N/m F B k 6 m

3 m 1 m 1 m Determine the natural period of vibration of the pendulum if it is given a small displacement and released. Consider the two rods to be slender, each having a weight of 120 N/m.

A 3.2 kg piece of putty is dropped 2.3 m onto the initially stationary block, which is supported by four springs, each of which has a constant k = 900 n/m. Determine the displacement x as a function of time during the resulting vibration, where x is measured from the initial position of the block as shown.