It has been proposed that large flywheels could be used to, Physics

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It has been proposed that large flywheels could be used to

It has been proposed that large flywheels could be used to store energy. Consider a flywheel made of concrete (density 2060 kg/m³) in the shape of a solid disk, with a radius of13.7 meter and a thickness of 2.5 meter. If it's rotational kinetic energy is 693 MJ (6.93 x10⁸ Joule), find what is the angular velocity of the flywheel?

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