At any angular speed, a certain uniform solid cylinder of diameter D has twice as much rotational kinetic energy as a certain uniform thin-walled hollow cylinder of the same diameter when both are spinning about an axis through their centers. If the mass of the hollow cylinder is m, the mass of the solid cylinder is
A) 1/4 m.
B) 1/2 m.
C) m.
D) 4 m.
E) 8 m.

The car hoist allows the car to be driven onto the platform, after which the rear wheels are raised. if the loading from both rear wheels is 1380 lb, determine the force in the hydraulic cylinder ab. neglect the weight of the platform itself. member bcd is a right-angle bell crank pinned to the ramp at c. the force is positive if in tension, negative if in compression.

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?