Disk a has a mass of 6 kg and an initial angular velocity of 360 rpm clockwise; disk b has a mass of 3 kg and is initially at rest. the disks are brought together by applying a horizontal force of magnitude 20 n to the axle of disk a. knowing that µk = 0.15 between the disks and neglecting bearing friction, determine (a) the angular acceleration of each disk, (b) the final angular velocity of each disk.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

it is a negative acceleration