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The Pulley System Drawn Lifts a Load of 150 N When an Effort of 60 N is Applied. Find Its Mechanical Advantage. - Physics

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प्रश्न

The pulley system has drawn lifts a load of 150 N when an effort of 60 N is applied. Find its mechanical advantage.

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उत्तर

Mechanical advantage (M.A) = `"Load"/"Effor" = "150N"/"60N" = 5/2 = 2.5`

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2017-2018 (March) Set A

संबंधित प्रश्न

Explain how a gear system can be used to obtain gain in speed? Given one example.


Explain how a gear system can be used to obtain gain in torque? Given one example.


In a gear system, the gear ration of the driving wheel A and driven wheel B is 10:1. To rotate the driven wheel B in the direction of driving wheel A, the driving wheel A is engaged with other wheel C. what should be the gear ratio of the wheels A and C?


Give reason for the following:
 In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.


Name the type of single pulley that can act as a force multiplier. Draw a labeled diagram of the pulley mentioned by you.


In the case of a block and tackle arrangement, the mechanical advantage increases with the number of pulleys. Explain.


What is a block and tackle system of pulleys? What precautions would you observe while rounding the string so that the effort is applied in the downward direction?


A block and tackle system of pulleys has a velocity ratio of 4.

  1. Draw a labelled diagram of the system indicating clearly the points of application and directions of load and effort.
  2. What is the value of the mechanical advantage of the given pulley system if it is an ideal pulley system?

A man raises a load of 360 kgf using a block and tackle system of 3 pulleys. If the efficiency of the pulley system is 60%, what effort is applied by the man?


A boy lifts a load of 40 kgf through a vertical height of 2m in 5s by using a single fixed pulley when he applies an effort of 48 kgf. Calculate:
(i) the mechanical advantage, and
(ii) the efficiency of the pulley. Why is the efficiency of the pulley is not 100%?
(iii) the energy gained by the load in 5s, and
(iv) the power developed by the boy in raising the load.


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