A teenager tangentially pushes a small hand-powered carousel and is able to accelerate it from rest to a frequency of 15 rpm in 10.0 s. Suppose the carousel is a uniform disk of radius 2.5 m and has a mass of 760 kg. and two children (each with a mass of 25 kg) sit opposite each other on the edge. (a) Calculate the torque required to produce the acceleration. neglecting the friction torque. (b) What force is needed at the edge