A 100 N m torque is applied to the gear shaft system consisting of solid circular shafts. Both shafts have diameter d= 20 mm and are made froms teel with a modulus of rigidity G= 75 GPa . The shafts are free to rotate within their bearings, but the left end of the lower shaft is rigidly attached to a wall, preventing rotation there. Assuming that the gears are rigid,
What is the rotation at point B?
What is the rotation at point D?