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A pulley is made to rotate by a driving belt (Fig.). The radius r of the pulley is 25 cm, and the pulley speed is 120 rev/min. The tension in the lower branch of the belt is twice the tension in the upper branch, both branches being parallel. Find the tension in the upper and lower branches of the belt if the belt delivers 15 kW of power to the pulley.

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Answer:

Explanation:

The pulley will rotate under the action of a force F—f; the velocity of the circumference of the pulley is v = πrn. The power is N= (F—f)2πrn; since F = 2f, then

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