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प्रश्न
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उत्तर
The work done by the gravitational force of the sun on earth during its motion around the sun is zero because at every point, the displacement of earth is perpendicular to the gravitational force of sun i.e.,
W = Fd cos 900 = 0
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संबंधित प्रश्न
Define 1 J of work.
Why is a jack screw provided with a long arm?
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.
Give reasons for the following. No work is done if a man is pushing against a wall.
What do you mean by a kilo joule?
Define 'joule'.
On what factors does the work done by a force depend?
What should be the characteristic of a source of energy?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
