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Q4) A 500 kg mass is to be raised vertically by a screw jack. The single start thread is square with a 12 mm pitch and a 50 mm mean diameter. The coefficient of friction is 0.15.

Calculate EACH of the following:

a) the effort required to raise the load at the end of a 300 mm lever; (12)

b) the efficiency of the screw jack when raising the load. (4)