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MHT CET Physics question

PhysicsLaws of MotionMHT CET

A string of length 'l' is fixed at one end and carries a mass 'm' at the other end. The mass is revolving along a horizontal circle of radius 'r' making '' as the semi-vertical angle of cone and revolutions per second around the vertical axis through fixed end. The tension in the string is [MHT-CET 2020]

Answer: (C)

Solution

with gives , and

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Question ID VK-039571