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A slab door, 2m high, 0.75m wide, 40mm thick, and with a mass of 36kg, is fitted with an automatic door closer. The door opens

A slab door, 2m high, 0.75m wide, 40mm thick, and with a mass of 36kg, is fitted with an automatic door closer. The door opens against a torsion spring with a modulus of 10N-m/radian. Determine the necessary damping to critically dampen the return swing of the door. If the door is opened 90 degree and released, how long will it take until the door is within 1 degree of closing?

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