Question

Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 2.0 m diameter and a mass of 250 kg . Its maximum angular velocity is 1600 rpm .

Part A. A motor spins up the flywheel with a constant torque of 59 N⋅m . How long does it take the flywheel to reach top speed? t= 350s

Part B. How much energy is stored in the flywheel? E= 1.8x10^6 J

Part C. The flywheel is disconnected from the motor and connected to a machine to which it will deliver energy. Half the energy stored in the flywheel is delivered in 2.5 s . What is the average power delivered to the machine? P=3.5x10^5 W

Part D. How much torque does the flywheel exert on the machine? Express your answer to two significant figures and include the appropriate units.

I just need Part D. Parts A,B,C have the correct answers next to them after the question.

Answer 1