Question

How efficient is pulley system if an operator has to pull 4.0m of rope to raise a 250N pail of water a distance of 2.0m? The operator is pulling with the force of 150N.

Please take your time, and answer it correctly by explanation.

Answer 1

Answer:

The efficiency of the pulley

Explanation:

The amount of work done by a force to displace an object is found from the equation

W = F*d*cos(Theta)

The force required to raise the car at constant speed is equivalent to the weight (m*g) of the car. Since the 2400-kg car weighs 2X as much as the 1200-kg car, it would require twice as much work to lift it the same distance.

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