In the figure, a block of weight $60\, N$ is placed on a rough surface. The coefficient of friction between the block and the surfaces is $0.5$. ........ $N$ should be the maximum weight $W$ such that the block does not slip on the surface .
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Frictional force,
${F=\mu R=0.5 \times m g=0.5 \times 60=30 \mathrm{N}}$
$\mathrm{Now}$ $\mathrm{F}=\mathrm{T}_{1}=\mathrm{T}_{2} \cos 45^{\circ}$
$\text { or } \quad 30=\mathrm{T}_{2} \cos 45^{\circ}$
${\text { and }} {W=T_{2} \sin 45^{\circ}} $
${\therefore \quad} {W=30 \mathrm{N}}$
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