A Steel Flywheel in the Form of a Solid Disk $0.1 \mathrm {~m}$

question 11

Essay

A steel flywheel in the form of a solid disk has a radius of 0.2 m and a thickness of $0.1 \mathrm {~m}$ .
(a) What is the maximum rotational frequency that is compatible with the material characteristics of this flywheel?
(b) What is its energy storage capacity at maximum rotational frequency?
(c) If the flywheel is energized by a motor with a power output of $1 \mathrm {~kW}$ (at $100 \%$ efficiency) how long would it take to increase the rotational frequency from zero to the maximum?

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