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A block on table shown in figure is just...

A block on table shown in figure is just on the wedge of slipping. Find the coefficient of static friction between the block and table top.

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`(T sin 30^(@))/(T cos 30^(@))=(mu mg)/(80)` ,
`Tan 30^(@)=(mu 40)/(80), (1)/(sqrt(3))=(mu)/(2)`
`rArr mu = (2)/(sqrt(3))=1.15`
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