The wheel shown on the right is composed of a brown solid disk and a gray solid disk. They are attached to each other, and each of them has a mass of 10 kg. The moment of inertia for solid disks can be calculated by the equation: Ic = (1/2)mr^2. a) Find the net torque on the wheel, taking a = 12 cm and b = 25 cm. Please also determine the direction of the net torque by the right-hand rule. (9 pts)