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How much work does a putting force of 40...

How much work does a putting force of 40 N do on the 20 kg box in pulling it 8 m across the floor at a constant speed. The pulling force is directed at 60° above the horizontal

A

` 160 J`

B

` 277 J `

C

` 784 J`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
` W= overset( to ) F , overset( to) s = 40 xx 8 xx cos 60 ^(@) = 160 J`
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Knowledge Check

  • The coefficient of kinetic friction between a 20 kg box and the floor is 0.40. How much work does a pulling force do on the box in pulling it 8.0 m across the floor at constant speed? The pulling force is directed 37^@ above the horizontal.

    A
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    B
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    C
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    D
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    A
    the work done by the boy on the block 163.32J.
    B
    the normal force on the surface by the block is 40.8N.
    C
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    D
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    A
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    B
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    C
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    D
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