A small block of mass 100 g is tied to a spring of spring constant 7. 5 N m -1 and length 20 cm. The other end of spring is fixed at a particular point A. If the block moves in a circular path on a smooth horizontal surface with constant angular velocity 5 rad s -1 about point A, then tension in the spring is
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A
Centripetal force will be provided by the spring force. Let the elongation in the spring be x, then we can write
Therefore, required tension will be T = kx = 0. 75 N.
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