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प्रश्न
Give reason for the following:
In case of a block and tackle arrangement, the mechanical advantage increases with the increase in the number of pulleys.
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उत्तर
This is because mechanical advantage is equal to the total number of pulleys in both the blocks.
संबंधित प्रश्न
A pulley system with VR = 4 is used to lift a load of 175 kgf through a vertical height of 15 m. The effort required is 50 kgf in the downward direction. (g = 10 N kg-1)
Calculate:
- Distance moved by the effort
- Work done by the effort
- M.A. of the pulley system
- Efficiency of the pulley system
Is the above pulley system an ideal machine or not?
Select the correct alternative:
A pulley is used because of it
The mechanical advantage of an actual pulley is less than one. Give a reason. What is the justification for using the pulley then?
What should be the gear ration of a car : equal to 1, less than 1 or greater than 1, while ascending a hill ?
The mechanical advantage of an ideal single movable pulley is ______.
The diagram below shows a pulley arrangement.
(i) In the diagram, mark the direction of the forces due to tension, acting on the pulley P.
(ii) What is the purpose of the pulley Q?
(iii) If the tension is T newton, deduce the relation between T and E.
(iv) Calculate the velocity ratio of the arrangement.
(v) Assuming that the efficiency of the system is 100%, what is the mechanical advantage?
(vi) Calculate the value of E
Give a reason for the following:
In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.
Name a machine which is used to:
change the direction of force applied.
What is a pulley?
