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

Can P.E. of an object be negative?

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Yes , P.E is negative when forces involved with P.E are attractive in nature .
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MODERN PUBLICATION-WORK, ENERGY AND POWER -Revision Exercise (Very Short Answer Questions)
  1. The correct relation between joule and erg is

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  2. What is the work done by the sun on the earth when the earth revolve...

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

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  4. Is the mechanical energy always conserved ?

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  5. What will happen to the potential energy of an air bubble in water ...

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  6. A spring of spring constant k is cut in three equal pieces. The spring...

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  7. When is KE of a planet revolving around the sun maximum?

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  8. If K.E of a body is made three times , how will the momentum change...

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  9. If the momentum of a body is made three times , how will the kineti...

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  10. A bullet gets embedded in a wooden block. Where does its KE go?

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  11. One horse power is equal to

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  12. What is the power ? Write its dimensional formula .

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  13. How can you say that friction is a non - conservative force ?

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  14. The work done by the centripetal force in quarter revolution would be,

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  15. Can we change K.E of a system without changing its momentum ?

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  16. What will happen to potential energy of a spring when it is compresse...

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  17. What wil happen to potential energy of a spring when it is streched ...

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  18. What changes in uniform circular motion , momentm or K.E ?

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  19. What is an elastic collision ?

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  20. Inelastic collision is the-

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