A block is in limiting equilibrium on a rough horizontal surface. If the net contact force is 3 times the normal force, the coefficient of static friction is
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a
2
b
12
c
0.5
d
13
answer is A.
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Detailed Solution
Net contact force=N2+f2 3N=N2+f2 3N2=N2+f2⇒2N2=f2 f=2N∵f=μ N ∴μ=2