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Does the sun do any work on earth, when ...

Does the sun do any work on earth, when earth revoves around the sun in a perfectly circular orbit?

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No, because angle between gravitational pull and direction of motion at any instant is `theta=90^(@)`.
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PRADEEP-WORK, ENERGY AND POWER-Very Short Anwer Question.
  1. Is it practically possible to have situtations where (E-V)lt0?

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  2. Can K.E. of a system be increased or decreased without applying any e...

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  3. Does the sun do any work on earth, when earth revoves around the sun i...

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  4. Does K.E. depend upon the direction of motion involved ? Can it be ne...

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  5. Name the largest and smallest practical unit of energy.

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  6. Is work done by a non conservative force always negative ? Comment.

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  7. Does potential energy of a spring decrease // increase when it is comp...

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  8. When an air bubble rises in water, what happens to its potential energ...

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  9. Name the process in which momentum changes but KE does not.

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  10. A shot fired from a cannon explodes in air. What will be the changes i...

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  11. The momentum of an object is doubled. How does its K.E. change?

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  12. Can P.E. of an object be negative?

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  13. Does the work done in moving a body depend on how fast or how slow the...

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  14. A spring is cut into two equal halves. How is the spring constant of e...

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  15. Is it possible exert a force which does work on a body without changin...

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  16. In case of a moving body as force of friction is mumg, can we regard m...

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  17. A ball of mass m moving with vel. V strikes head on elastically with a...

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  18. Is it possible to have a collision in which the whole of KE is lost?

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  19. If two objects collide and one is initially at rest (a) is it possible...

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  20. In which, elastic or inelastic collision, the momentum is conserved ? ...

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