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Q6) A slider crank mechanism drives a block between two parallel, horizontal guides as shown in fig Q6. The block has a stroke of 120 mm and oscillates in simple harmonic motion with a frequency of 1.667 Hz. The mass of the block is 2 kg and the coefficient of friction at the contact surfaces of the guide is 0.12. When the connecting rod is 15^o above the line of stroke, the block is 40 mm away from its mid-stroke position.

Calculate EACH of the following:

a) the kinetic energy of the block; (6)

b) the force in the operating. (10)