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प्रश्न
Define the term energy.
Define energy.
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उत्तर १
“Capacity of doing work” is called Energy.
उत्तर २
Energy, in physics, is the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. There are, moreover, heat and work-i.e., energy in the process of transfer from one body to another.
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संबंधित प्रश्न
Define 1 J of work.
A coolie does no work against the force of gravity while carrying a luggage on a road.
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
State two factors on which the work done on a body depends.
State the S.I. unit of energy.
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
Does the earth move around the sun with a uniform velocity?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?
Fill in the boxe to show the corresponding energy transformation.
Give an example
Chemical energy changes to electrical energy.
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
