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A porter with a suitcase on his head is ...

A porter with a suitcase on his head is climbing up steps with uniform speed. The work done by the "weight of the suitcase" on the suitcase is …..

A

Positive

B

Negative

C

Zero

D

Undefined

Text Solution

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The correct Answer is:
B
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  1. A porter with a suitcase on his head is climbing up steps with uniform...

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  2. Human beings or machines need ……………. to do work.

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  3. Work is said to be done in the following case.

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  4. The energy possessed by a wounded spring in a toy car is

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  5. The energy possessed by a running athlete is

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  6. Energy possessed by the blowing wind is ……………. energy.

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  7. The energy possessed by a body due to its height or position is …………… ...

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  8. The sum of kinetic energy and the potential energy of an object is cal...

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  9. The total mechanical energy of an aeroplane at rest is …………..

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  10. In fuels like petroleum, cook, etc. ……… energy is stored in them.

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  11. Rate of doing work or rate of transfer of energy is defined as ……………

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  12. In case of a freely falling body ………. energy is gradually converted in...

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  13. The water stored in overhead tanks, possesses ……………….. energy.

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  14. ………………. energy is used by plants for preparing their food.

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  15. Work done by force applied by hands of a man swimming in a pond is ………

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  16. Energy of running water is …………….. energy.

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  17. Energy of a raised hammer is …………… energy.

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