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

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

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

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

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

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

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

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

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  9. A mass of 10 kg is at a point A on a table. It is moved to a point B. ...

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  10. What is the work done by the force of gravity on a satellite moving ro...

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  11. Think of situation when an obejct gets displaced in the absence of a f...

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  12. An object thrown at a certain angle to the ground moves in a curved pa...

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  13. When is the work done by a force is positive and negative ?

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  14. How is work calculated, if a applying force to the object (i) there is...

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  15. Four men lift a 250 kg box to a height of 1 m and hold it without rais...

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  16. A boy is moving on a straight road against a frictional force of 5 N. ...

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  17. Name different types of energy. Give the unit of energy.

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  18. A freely falling object eventually stops on reaching the ground. What ...

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  19. Write a suitable reason for heating up of a metal when hit by a fast m...

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

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