Two-stage gearbox. Given specification : Input torque (Nm)= 50, Output torque (Nm)= 100, First Stage (Gear) = Helical Second Stage (Gear) = Helical, Input speed (rpm) = 500, Gear Material= 16MnCr5 Q.1) Make the following calculations according to the above data. a.Calculate the external forces and the forces on the bearings. b. Analyze the selected shafts. c. Make the calculations of the selected bearings.