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State the principle of conservation of energy.How can it be proved in case of a freely falling body?

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BINA LIBRARY-WORK,ENERGY AND POWER-EXERCISE
  1. Derive an expression for potential energy of a stretched elastic sprin...

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  2. State and prove work-energy theorem.

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  3. State the principle of conservation of energy.How can it be proved in ...

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  4. Show that work done on a body or by the body is equal to the net chang...

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  5. Show that the sum of potential and kinetic energy of a body falling fr...

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  6. Distinguish between elastic and inelastic collisions.

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  7. Show that in one dimensional elastic collision of two particales of eq...

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  8. Define the co-efficient of restitution. A particle of a mass m moving ...

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  9. The momentum of two different masses are same.Show that the lighter ma...

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  10. The K.E of two different masses are equal.Which of the masses,lighter ...

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  11. If K.E of a body is doubled,what happens to its momentum?

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  12. Two bodies having masses 1g and 4g are moving with equal K.E find the ...

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  13. water of a river is striking the pillar of a bridge.Is work being done...

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  14. A man is swimming upstream over a river such that he appears to be at...

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  15. How much work is done on a body of mass m in moving it around a horizo...

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  16. Give an example where work done by a force is zero.

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  17. What is the power needed to maintain uniform circuler motion?

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  18. Can a body have energy without having momentum?

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  19. A ballon filled with hydrogen rises upward gaining both kinetic and po...

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  20. A man of mass 60 kg walks up to the top of a building of height 15 m....

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