The motor is geared to a shaft on which a flywheel is mounted. The mass moments of inertia of the parts are flywheel, I = 2.73 in · lb · s2; flywheel Figure P12.23 RAO2 = 16 in, RO4O2 = RBA = 40 in, RBO4 = 56 in, RG3A = 32 in, and RG4O2 = 20 in.

shaft, I = 0.015 5 in·lb·s2; gear, I = 0.172 in·lb·

s2; pinion, I = 0.003 49 in · lb ·s2, and motor, I =

0.086 4 in·lb·s2. If the motor has a starting torque of 75 in · lb, determine the angular acceleration of the flywheel shaft at the instant the motor is started.

Gear 9 D.

Flywheel Motor Pinion 2 D.

Figure P12.24