A rope is wrapped around the rim of a large uniform solid disk of mass 155 kg and radius 2.00 m. The horizontal disk is made to rotate by pulling on the rope with a constant force of 195 N. If the disk starts from rest, what is its angular speed in rev/s at the end of 1.85 s? rev/s

A figure skater performs a twisting jump. She rotates around her longitudinal axis 2 times in 0.65 s.  What was her average angular velocity in radians/second? A   720rad/s  B   19.3rad/s C   4? rad/s D   9.67 rad/s E   1107 rad/s

Two tangential forces F1 = 25 N and F2 = 10 N are applied to the rim of a solid cylinder of radius R = 0.2 m. The cylinder starts to rotate from rest, and reaches angular speed of 50 rpm in 5 seconds. Find the mass of the cylinder.

A child of mass 40 kg stands beside a circular platform of mass 115 kg and radius 1.6 m spinning at 3.4 rad/s. Treat the platform as a disk. The child steps on the rim. What is the new angular speed? in rad/s  She then walks to the center and stay there. What is the angular velocity of the platform then? in rad/s What is the change in kinetic energy when she walks from the rim to the center of the platform? in J