Q-07 (10 points) Two solid spheres of each with mass m2-2.5kg and radius r=18cm are attached to a solid rod of mass m1=5.8kg and Rod length 1.6m and the system rotates around center of mass of Solid Solid Sphere Sphere the rod on xz plane. a) Find the total moment of inertia of the combined object? (4 points) b) What is its angular momentum when the combined object rotates at 7.5 rad/s? (3 points) c) By applying external torque object's angular speed is increased to 12rad/s in 15 seconds. Find the external torque? (3 points)