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प्रश्न
State two factors on which power spent by a source depends. Explain your answer with examples.
उत्तर
A source's use of power depends on two things:
- The amount of work done by the source, and
- The time taken by the source to do the said work.
Example: Should a coolie A take one minute to raise a load to a bus roof, and another coolie B take two minutes to do the same, Both coolies accomplish the same amount of work; however, because coolie A works more quickly, the power expended by him is double that of coolie B.
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संबंधित प्रश्न
When does a force do work?
State the condition when the work done by a force is positive. Explain with the help of examples.
Name the quality which is measured in Wh.
What do you understand by the clockwise and anti clockwise moment of force?
State the principle of moments.
What is the work done when the force on the object and the displacement of the object are perpendicular to each other?
State the condition when the work done by the force is negative.
State two conditions for work to be done.
For the following scenarios, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
A man raises a box of mass 50 kg to a height of 2 m in 20 s, while another man raises the same box to the same height in 50 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1
