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Q4. A Hartnell governor has two flyweights each of mass 0.5 kg. The flyweight arm length is 60 mm and the sleeve arm length is 25 mm. At a governor speed of 1600 rev/min and rising, the radius of the flyweights is 30 mm. A speed increase of 2% causes the central sleeve to move by 1.2 mm. Friction in the governor is equivalent to a force of 40 N at the sleeve. Calculate the spring stiffness.