A child's toy has a solid plastic sphere of radius 20cm that can be rotated about its center. Child A applies a force of 30N tangent to the edge of the sphere to cause it to rotate counter clockwise. Child B also applies a force of 20N tangent to the edge of the sphere to cause it to counter clockwise. The net torque applied to the sphere causes an angular acceleration of 8.33rad/s^2. a) What is the moment of inertia of the solid plastic sphere? (answer: 1.2kgm^2) b) What is the mass of the solid plastic sphere? (answer: 75kg)