(Answered) A gas turbine disc in a modern jet engine has a mass of 150

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A gas turbine disc in a modern jet engine has a mass of 150 kg, a diameter of 1 metre, and spins at 10 000 rpm.

Taking a simplified model of the shape of the disc as a uniform thick ring with inner and outer diameters of 250 mm and 1,000 mm respectively, calculate its kinetic energy when spinning at full speed.

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