Flywheels are large, massive wheels used to store energy. They can be spun up sl
ID: 2250675 • Letter: F
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 2.0m diameter and a mass of 270kg. Its maximum angular velocity is 1400rpm.
A) t=330 s
B) E=1.5*10^6 J
Both correct
Find
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 2.3s. What is the average power delivered to the machine? in W
D) How much torque does the flywheel exert on the machine? in N*m
rpm
Explanation / Answer
First, find the angular acceleration of the disk:
? = I?
? = ? / I
The moment of inertia for a solid disk is mr