Question

The system shown in just on the verge of slipping. The co-efficient of static friction between the block and the table top is

• A. 0.5
• B. 0.95
• C. 0.15
• D. 0.35

Answer 1

The correct option is D 0.35

Equilibrium at R

$T_1=8N$

Equilibrium at P

$T_2\sin 30=T_1{T}_2=\frac{8}{\sin 30}=16N{T}_2\cos 30=T_3{T}_3=16\cos 30$

Equilibrium at Q

N=40N

$T_3=\mu N\mu =\frac{16\cos 30}{40}=\frac{\sqrt{3}}{5}=0.35$