, In the gear-train system shown in the figure below, the moments of inertia of gears are lumped as J1, J2, and J3. Tm (t) is the applied torque; N, N. N3 and 4 are the number of gear teeth. Assume rigid shafts (a) Assume that J1, J2, and J3 are negligible. Write the torque equations of the system. Find the total inertia the motor sees. (b) Repeat part (a) with the moments of inertia /1, J2, and J3. MOTOR Jm 3 J T R$ T h LOAD