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Give two examples from daily life where according to physics, work done is zero.

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SL ARORA-Work, Energy and power-EXERCISE
  1. A coolie with load on his head is walking on a horizontal platform. Wh...

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  2. An artificial satellite is at a height of 36,500 km above earth's surf...

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  3. Give two examples from daily life where according to physics, work don...

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  4. What is the source of KE of falling rain drops ?

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  5. State work-energy theorem.

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  6. What is spring constant ? What are its SI units?

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  7. Calculate the number of joules in 1 kWh?

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  8. Show that 1J = 10^7erg

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  9. How will the momentum of a body change if its kinetic energy is double...

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  10. Show graphically the variation of potential energy of an object thrown...

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  11. How does kinetic energy of a moving ball change if its speed is reduce...

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  12. What is the work done by centripetal force in moving a body through ha...

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  13. What is an elastic collision ?

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  14. Define the term work. Calculate the work done by a constant force. Is ...

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  15. Give the expression for work done if angle between force oversetrighta...

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  16. Define the term work and derive its SI unit. Write an expression for t...

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  17. How do we calculate work done by a force ? Write any two conditions un...

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  18. What is the amount of work done by a weight-lifter in holding a weight...

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  19. What is the amount of work done by a weight-lifter in holding a locomo...

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  20. Derive an expression for the potential energy of an elastic stretched ...

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