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A boy pulls 5 kg block by 20 m along a h...

A boy pulls 5 kg block by 20 m along a horizontal surface at constant speed with a force directed `45^(@)` above the horizontal. If the coefficient of friction is 0.2, then

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

the normal on the surface by the block is mumg`.

D

none of these

Text Solution

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The correct Answer is:
A, B
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Knowledge Check

  • A block of weight 200N is pulled along a rough horizontal surface at constant speed by a force of 100N acting at an angle 30^(@) above the horizontal. The coefficient of kinetic friction between the block and the surface is

    A
    0.43
    B
    0.58
    C
    0.75
    D
    0.83

  • A block of weight 200N is pulled along a rough horizontal surface at contant speed by a force of 100N acting at an angle 30^(@) above the horizontal. The coefficient of kinetic friction between the block and the surface is .

    A
    `0.43`
    B
    `0.58`
    C
    `0.75`
    D
    `0.83`

  • A block is sliding on a rough horizontal surface. If the contact force on the block is sqrt2 times the frictional force, the coefficient of friction is

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    `0.25`
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    `1/sqrt2`
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