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Q.

A small sized mass m is attached by a massless string (of length L) to the top of a fixed frictionless solid cone whose axis is vertical. The half angle at the vertex of the cone is θ. If the mass rn moves around in a horizontal circle at speed v, what is the maximum value of v for which mass stays in contact with the cone? (g is acceleration due to gravity.)

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a

gL sin θ

b

gL cos θ

c

gL sin θ tan θ

d

gL tan θ

answer is C.

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Detailed Solution

At maximum velocity the mass will just loose contact with cone and will behave like free conical pendulum with time period

T = 2πL cos θg ω = 2πT=gL cos θ

Hence Vmax = (L sin θ)ω = gL sin θ tan θ

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