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प्रश्न
Why is a jack screw provided with a long arm?
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उत्तर
A jack screw is provided with a long arm in order to have the effortless than the load. According to the principle of moments, load x load arm = effort x effort arm. So, if the load arm is more, then the effort will be more than the load.
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संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? Give reason for your answer.
Find the kinetic energy of a body of mass 1 kg moving with a uniform velocity of 10 m s-1.
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
How many watts equal one horse power?
Choose one or more correct alternatives.
For work to be performed, energy must be ______.
- transferred from one place to another
- concentrated
- transformed from one type to another
- destroyed
Complete the following sentences:
1 H.P. = ........ W.
Fill in the boxe to show the corresponding energy transformation.
