Disk a, of weight 5 lb and radius r = 3 in., is at rest when it is placed in contact with a belt that moves at a constant speed v = 54.5 ft/s. knowing that μk = 0.20 between the disk and the belt, determine the time required for the disk to reach a constant angular velocity. (round the final answer to two decimal places.)

the answer is a 3.8cm

explanation:

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards