What is the use of a pulley?

In the figure find the speed of pulley P

Two mass m and 2m are attached with each other by a rope passing over a frictionless and massless pulley. If the pulley is accelerated upwards with an acceleration 'a', what is the value of tension?

A 45 N brick is suspended by a light string from a 2.0 kg pulley. The brick is released from rest and falls to the floor below as the pulley rotates through 5.0 rad. The pulley may be considered a solid disk of radius 1.5 m. What is the angular speed of the pulley?

The diagram shows a fixed pulley used by a boy to lift a load of 400 N through a vertical height of 5 m is 10 s. The effort applied by the boy on the other end of the rope is 480 N. (a) What is the velocity ratio of the pulley ? (b) What is the mechanical advantage? (c) Calculate the efficiency of the pulley. (d) Why is the efficiency of the pulley not 100%? (e) The boy has to apply an effort which is greater than the load he is lifting. What is the justification for using the pulley?

Margaret notices that there are ceramic pulley-like structures attached to the overhead electrical lines near her house. Electrical wires pass over the pulleys. These pulleys are used as electrical

Margaret notices that there are ceramic pulley-like structures attached to the overhead electrical lines near her house. Electrical wires pass over the pulleys as shown in the given figure. These pulleys are used as electrical

What is the velocity ratio of the single-pulley system shown?

What is the velocity ratio of the two-pulley system shown?

A motor rotates a pulley of radius 25cm at 20rpm. A rope around the pulley lifts a 50kg block, What is the power output of the motor?

In the figure shown all pulleys are ideal and small. The central pulleys is 2 m away from both ends. What is the length (in m) of the string ? The system is in equilibrium