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ashna Group Title

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

  • 2 years ago
  • 2 years ago

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  1. akash123 Group Title
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    try it by ur own...I'll help u

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

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

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

    • 2 years ago
  5. akash123 Group Title
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    |dw:1348895105918:dw|

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

    • 2 years ago
  7. ashna Group Title
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    yes right !

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

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

    • 2 years ago
  10. ashna Group Title
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    N

    • 2 years ago
  11. ashna Group Title
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    YES

    • 2 years ago
  12. akash123 Group Title
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    |dw:1348895307961:dw|

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

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

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

    • 2 years ago
  16. ashna Group Title
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    vertical so cos 0 = 1

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

    • 2 years ago
  18. akash123 Group Title
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    yes...perfectly right...:)

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

    • 2 years ago
  20. ashna Group Title
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    yeah , okay ty :D

    • 2 years ago
  21. akash123 Group Title
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    :)

    • 2 years ago
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