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23 Nov 2019
A disk with a mass of 13.3 kg, a diameter of 38.7 cm, and athickness of 6.89 cm is mounted on a rough horizontal axle as shownon the left in the figure. (There is a friction force between theaxle and the disk). The disk is initially at rest. A constantforce, F = 76.7 N, is applied to the edge of the disk at an angleof 37.0°, as shown on the right in the figure. After 2.00 s, theforce is reduced to F = 19.1 N, and the disk spins with a constantangular velocity.
a) What is the magnitude of the torque due to friction between thedisk and the axle?
b) What is the angular velocity of the disk after 2.00 s?
c) What is the kinetic energy of the disk after 2.00 s?
A disk with a mass of 13.3 kg, a diameter of 38.7 cm, and athickness of 6.89 cm is mounted on a rough horizontal axle as shownon the left in the figure. (There is a friction force between theaxle and the disk). The disk is initially at rest. A constantforce, F = 76.7 N, is applied to the edge of the disk at an angleof 37.0°, as shown on the right in the figure. After 2.00 s, theforce is reduced to F = 19.1 N, and the disk spins with a constantangular velocity.
a) What is the magnitude of the torque due to friction between thedisk and the axle?
b) What is the angular velocity of the disk after 2.00 s?
c) What is the kinetic energy of the disk after 2.00 s?
