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In which of the following applications i...

In which of the following applications is work is not done?

A

Shopping in the supermarket

B

Standing with a basket of fruit on the head

C

Climbing a tree to pluck

D

Pushing a wheelbarrow of bricks.

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MODERN PUBLICATION-WORK AND ENERGY-EXERCISE
  1. If mass is doubled and velocity is halved then new kinetic energy is

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  2. When the force retards the motion of the body, the work done is :

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  3. In which of the following examples, work done is negative?

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  4. In which of the following applications is work is not done?

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  5. For a force to do maximum work, what should be the angle between force...

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  6. State the SI unit of potential energy.

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  7. What is the commercial unit of electical energy? Represent it in terms...

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  8. A boy throws a rubber ball vertically upwards. What kind of work is do...

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  9. A boy throws a rubber ball vertically upwards. What kind of work is do...

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

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  11. Express kilowatt hour in terms of joules.

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  12. Two children A and B each weigh 20 kg climb a rope up a height of 10 m...

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  13. Two children A and B each weigh 20 kg climb a rope up a height of 10 m...

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  14. In a house 3 bulb of 25 W. Each are used for 5 hours a day. Calculate ...

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  15. State the law of conservation of energy. Show that the energy of a fre...

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  16. The work done on a object does not depend upon the

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  17. In case of negative work the angle between the force and displacement ...

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  18. Water stored in a dam possesses

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  19. Which one of the following is not the unit of energy?

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  20. Two boys A and B do equal work. They will have equal power if

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