Questions
A boy is sitting on a horizontal platform in the shape of a disc at a distance of 5m from its centre. The boy begins to slip when the speed of wheel exceeds 10 rpm The coefficient of friction between the boy and platform is
(g = 10 ms–2)
detailed solution
Correct option is B
w = 10×(2π/60) rad/s
w = π/3 rad/s
r = 5m
mw2r = μmg = f
μ = π2/18
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