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Q.

If coefficient of friction between the surface in contact is 0.75 then tension in the string is 
(sin 370 = 0.6)

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a

zero 

b

50 N 

c

30 N 

d

40 N

answer is D.

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Detailed Solution

Angle of repose
 ϕ=tan−10.75=370
 θ<ϕ⇒ friction balances the  

component of weight
 ⇒ T=0

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If coefficient of friction between the surface in contact is 0.75 then tension in the string is (sin 370 = 0.6)