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JEE Main Physics question

PhysicsMechanical Properties of SolidsJEE Main

A 15 kg mass attached to the end of a steel wire of unstretched length 1 m is whirled in a vertical circle with an angular frequency of 2 rev at the bottom of the circle. The cross-section of the wire is . The elongation of the wire in mm when the mass is at the lowest point of its path is (Take, , and )

Answer: 2.55

Solution

, . At the lowest point, . Area

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Question ID VK-155224