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A person holds a bundle of hay over his ...

A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.

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The work done by the person is zero. The force is applied on the bundle of hay but as there is no displacement, the work done is zero.
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KUMAR PRAKASHAN-WORK AND ENERGY -QUESTION & ANSWER (ANSWER THE FOLLOWING QUESTIONS IN SHORT :)
  1. Write a suitable reason for heating up of a metal when hit by a fast m...

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  2. The figure show a simple pendulum consisting a bob of mass 100 g. Init...

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  3. Certain force acting on a 20 kg mass changes its velocity from 5ms^(-1...

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  4. An object of mass 16 kg has 3200 J of kinetic energy. What will be its...

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  5. Find the momentum of a body of mass 100 g having kinetic energy 500 J.

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  6. An object of mass, m is moving with a constant velocity v. How much wo...

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  7. Calculate the work required to be done to stop a car of 1500 kg moving...

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  8. Can kinetic energy be negative? Why?

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  9. Give any four illustrations of the kinetic energy.

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  10. An object of mass 40kg is raised to a height of 5 m above the ground. ...

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  11. What are the various energy trans-formations that occur when you are ...

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  12. Does the transfer of energy take place when you push a huge rock with ...

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  13. The potential energy of a freely falling object decreases progressivel...

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  14. A battery lights a bulb. Describe the energy changes involved in the p...

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  15. A person holds a bundle of hay over his head for 30 minutes and gets t...

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  16. An electric heater is rated 1500 W. How much energy does it use in 10 ...

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  17. In each of the following a force F is acting on an object of mass m. T...

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  18. Soni says that the acceleration in an object could be zero even when s...

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  19. Find the energy in kWh consumed in 10 hour by 4 devices of power 500 W...

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  20. A certain household has consumed 250 units of energy during a month. H...

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