A block of mass 50 ,kg can slide on a rough horizontal surface. coefficient of friction between bloc

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4-2.Friction

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A block of mass $50 \,kg$ can slide on a rough horizontal surface. The coefficient of friction between the block and the surface is $0.6$. The least force of pull acting at an angle of $30^°$ to the upward drawn vertical which causes the block to just slide is ........ $N$

A

$29.43$

B

$219.6$

C

$21.96$

D

$294.3$

Solution

(d) For limiting condition $f = \mu R$

$F\sin 30^\circ = \mu (mg – F\cos 30^\circ )$,

By solving $F = 294.3\;N$

Standard 11

Physics

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