A board is balanced on a rough horizontal semicircular log. Equilibrium is obtained with the help of addition of a weight to one of the ends of the board when the board makes an angle θ θ with the horizontal. Coefficient of friction between the log and the board is
Text Solution
Verified by ExpertsThe correct answer is:
A
Let m b be the mass of board and m be the mass placed at one end of the board.
Then for equilibrium
μ μ N cos θ θ = N sin θ θ
i.e., μ μ = tan θ θ
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