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ashna

  • 3 years ago

How much work is done by a coolie walking on a horizontal platform with a load on his head ? justify .

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  1. akash123
    • 3 years ago
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    zero

  2. ashna
    • 3 years ago
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    can yu explain ?

  3. akash123
    • 3 years ago
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    |dw:1348894242952:dw|

  4. akash123
    • 3 years ago
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    N is the force applied by coolie on the load...right?

  5. ashna
    • 3 years ago
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    yes

  6. akash123
    • 3 years ago
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    |dw:1348894348026:dw|

  7. akash123
    • 3 years ago
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    now...definition of work= F . (Displacement) it's a dot product....right?

  8. ashna
    • 3 years ago
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    right

  9. akash123
    • 3 years ago
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    |dw:1348894463777:dw|

  10. akash123
    • 3 years ago
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    work done by coolie = N *( displacement) * cos 90'

  11. ashna
    • 3 years ago
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    yes 0 , okay ty :)

  12. akash123
    • 3 years ago
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    :)

  13. sam291
    • 3 years ago
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    But if he wasn't exerting a force with the help of friction, on the platform, in the opposite direction from where he's going, then he wouldn't move forward. And the force in the opposite direction caused by friction will be greater because of the load on his head. Am I wrong?

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