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Problem 7: Find the power developed by an engine with torque 1110 N m applied at 5500 rpm.

Problem 8: A motor turning at 1500 rpm is fitted with a gear having 50 teeth. Find the speed of the driven gear if it has 40 teeth.

Problem 9: The larger of the two gears in a clock has 36 teeth and turns at a rate of 0.50 rpm. How many teeth does the smaller gear have if it rotates at 1?50 rev/s?

Problem 12: Two people are standing 3.00 m apart. The first one has a mass of 85.0 kg and the second's mass is 98.0 kg. Find the gravitational attraction between the two people.