Discussion
A flywheel stores energy as
Answer: B
Correct answer: the kinetic energy of a rotating mass
A flywheel holds energy in the rotation of its rotor:
\[ E = \tfrac{1}{2}I\omega^2 \]Modern units use a composite rotor in a vacuum on magnetic bearings, spinning at tens of thousands of revolutions per minute, with a motor-generator to put energy in and take it out. The stored energy is limited by the tensile strength of the rim, which sets the maximum tip speed.
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