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Q.

A pulling force making an angle θ with the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is ϕ , the magnitude of the force required to move the body is equal to

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a

WCos⁡ϕCos⁡(θ−ϕ)

b

Wsin⁡ϕCos⁡(θ−ϕ)

c

WTan⁡ϕSin⁡(θ−ϕ)

d

WSin⁡ϕTan⁡(θ−ϕ)

answer is B.

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Detailed Solution

N+Psin⁡θ=mg,f=μkN
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