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In the arrangements shown, the pulley is...

In the arrangements shown, the pulley is smooth and the rope is inextensible. If the system is in equilibrium, the contact force between ground and block is

A

`30 N`

B

`40 N`

C

`50 N`

D

`60 N`

Text Solution

Verified by Experts

The correct Answer is:
C

`rArr N + 30 sqrt2 sin 45^(@) = mg`
`30 sqrt2 cos 45^(@) = f`
`N = 70 - 30 " " f = 30 N`
`= 40 N`
Reaction force `= sqrt(N^(2) + f^(2)) = 50 N`
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Knowledge Check

  • In the arrangement shown, the pulleys are smooth and the strings are inextensible. The acceleration of block B is :

    A
    g/5
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    5g/5
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    `g//2`
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    D
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  • In the arrangement shown, the pulleys and strings are massless. The acceleration of block B is :

    A
    g/2
    B
    5g/3
    C
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