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Although the effort in using a pulley is...


Although the effort in using a pulley is the same as the load, what is the benefit of using a pulley ?

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What are the advantages of using a pulley?

A movable pulley is used as:

The adjacent Figure shows a fixed pulley used by a boy to lift a load of 400 N through a vertical height of 5 m in 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 pully. (d) Why is the efficiency of the pulley not 100% ? (e) What is the energy gained by the load in 10 s? (f) How much power was developed by the boy in raising the load ? (g) The boy has to apply an effort which is greater than the load he is lifting. what is the justification for using the pulley ?

A single fixed pulley is used because it:

What is the velocity ratio of a single fixed Pulley?

A boy uses a single fixed pulley to lift a load of 50 kgf to some height. Another boy uses a single movable pulley to lift the same load to the same height. Compare the effort applied by them. Give a reason to support your answer.

A thread is wound around two discs on either sides. The pulley and the two discs have the same mass and radius. There is no slipping at the pulley and no friction at the hinge. Find out the acceleration of the two discs and the angular acceleration of the pulley.

From the diagram given below, answer the questions that follow: What effort has to be applied at C to just raise the load L=20 kgf? (Neglect the weight of pulley A and friction).

What is the mechanical advantage of single fixed pulley:-

State whether the following statements are true or false by writing T or F. (a) The velocity ratio of a single fixed pulley is always more than 1. (b) The velocity ratio of a single movable pulley is always 2. (c) The velocity ratio of a combination of n movable pulleys with a fixed pulley is always 2^(n) . (d) The velocity ratio of a block and tackle system is always equal to the number of strands of the tackle supporting the load.