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प्रश्न
| Meera chose to use a block and tackle system of '9' pulleys instead of a single movable pulley to lift a heavy load. |
Why should she connect more number of pulleys in the upper fixed block?
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उत्तर
In the upper fixed block, she adds extra pulleys to increase the mechanical advantage.
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संबंधित प्रश्न
Fill in the blank:
A pulley is used to change ........................
What is the mechanical advantage of an ideal pulley?
Answer the following in detail.
How does a pulley make work simpler?
Define the following term in reference to a gear system for Gain in speed ?
Give reason for the following:
The lower block of a block and tackle pulley system must be of negligible weight
Name the type of single pulley that can act as a force multiplier. Draw a labeled diagram of the pulley mentioned by you.
Give reason for the following:
The efficiency of a pulley is always less than 100%
Give reason for the following:
In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys.
A pulley system has a velocity ratio of 4 and an efficiency of 90%. Calculate:
(i) the mechanical advantage of the system.
(ii) the effort required to raise a load of 300 N by the system.
