How much work is done by the motor in a cd player to make a cd spin, starting from rest? the cd has a diameter of 12.70 cm and a mass of 16.30 g. the laser scans at a constant tangential velocity of 1.150 m/s. assume that the music is first detected at a radius of 20.90 mm from the center of the disk. ignore the small circular hole at the cd's center.

Abasketball star covers 2.65 m horizontally in a jump to dunk the ball. his motion through space can be modeled precisely as that of a particle at his center of mass. his center of mass is at elevation 1.02 m when he leaves the floor. it reaches a maximum height of 1.90 m above the floor and is at elevation 0.910 m when he touches down again. (a) determine his time of flight (his "hang time"). (b) determine his horizontal velocity at the instant of takeoff. (c) determine his vertical velocity at the instant of takeoff. (d) determine his takeoff angle. (e) for comparison, determine the hang time of a whitetail deer making a jump with center-of-mass elevations yi = 1.20 m, ymax = 2.45 m, and yf = 0.750 m.