A system of rigid body consists of three small balls (m1 = 4 kg,
m2 = 5 kg, m3 = 6 kg) which are connected by massless rigid rod, is
placed on a flat, frictioness table. The axis of rotation coincides
with m1 and is perpendicular to the table, as shown in the figure.
At t = 0, a force F with magnitude 20 N directed vertically
downward acts on m2, causing the system which was initially at
rest to rotate. Calculate: a) moment of inertia of the system with
respect to axis of rotation, b) the magnitude of the torque
acting on the system at t = 0, c) the magnitude of angular
acceleration of the system at t = 0