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Q.

A block of weight W is held in equilibrium against a vertical wall by applying a horizontal force of 75 N. The surface of the wall is rough. Now, (consider μ < l)

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a

W < 75 N

b

W = 75 N

c

W > 75 N

d

None of these

answer is A.

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Detailed Solution

If W is in equilibrium f = WBut we know f ≤ μRHere R = 75 NHence W ≤ μR or(W ≤ μ(75))or 75 ≥ Wμ⇒ 75 = Wμor 75 > WμBut μ is generally less than 1∴ W < 75 N

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A block of weight W is held in equilibrium against a vertical wall by applying a horizontal force of 75 N. The surface of the wall is rough. Now, (consider μ < l)