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JEE Main Physics question

PhysicsMechanical Properties of SolidsJEE Main

A steel wire has length 2 m, radius 1 mm and . A 1 kg sphere is attached to one end of the wire and whirled in a vertical circle with an angular velocity of 2 revolutions per second. When the sphere is at the lowest point of the vertical circle, the elongation of the wire is nearly (take )

Answer: (A)

Solution

, so . At the lowest point, $T = mg+mlω^2 = 1×10 + 1×2×157.9

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Question ID VK-154890