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ashna

  • 3 years ago

A potter moving vertically up the stairs with a suitcase on his head does work . why ?

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  1. akash123
    • 3 years ago
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    try it by ur own...I'll help u

  2. ashna
    • 3 years ago
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    but i dont know and that is why i asked this question , give me the hints :)

  3. ashna
    • 3 years ago
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    and if you dunt mind can you teach me all types of questions like dis ?

  4. akash123
    • 3 years ago
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    1st make a block of mass m as I did in last question...

  5. akash123
    • 3 years ago
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    |dw:1348895105918:dw|

  6. akash123
    • 3 years ago
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    and coolie is holding it on his head...right?

  7. ashna
    • 3 years ago
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    yes right !

  8. akash123
    • 3 years ago
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    now u have to tell...who or what is exerting force on this load?

  9. akash123
    • 3 years ago
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    1st earth is pulling towards its center by force mg..right?

  10. ashna
    • 3 years ago
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    N

  11. ashna
    • 3 years ago
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    YES

  12. akash123
    • 3 years ago
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    |dw:1348895307961:dw|

  13. akash123
    • 3 years ago
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    and u have to find out..work done by the potter?

  14. akash123
    • 3 years ago
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    and the potter is exerting a force N on the load and the direction of force is vertically upward.

  15. akash123
    • 3 years ago
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    again work done by potter= Force. displacement = N *( displacement) * cos(theta)

  16. ashna
    • 3 years ago
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    vertical so cos 0 = 1

  17. akash123
    • 3 years ago
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    now this time u have to tell the value of theta if potter is moving vertically up

  18. akash123
    • 3 years ago
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    yes...perfectly right...:)

  19. akash123
    • 3 years ago
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    so potter has done some work...because work done is not equal to zero

  20. ashna
    • 3 years ago
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    yeah , okay ty :D

  21. akash123
    • 3 years ago
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    :)

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