The rectangular plate, with a mass of 3 kg and a uniform small thickness, is welded at the 45° angle to the vertical shaft, which rotates with the angular velocity of 20π rad/s. Determine the angular momentum H of the plate about O and find the kinetic energy of the plate.

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100 100 mm mm 45° y w = 20n rad/s Problem 7/64 200 mm--200 mm-