JEE Main 2013 Physics question
A body of mass ' m ' is tied to one end of a spring and whirled round in a horizontal plane with a constant angular velocity. The elongation in the spring is 1 cm. If the angular velocity is doubled, the elongation in the spring is 5 cm. The original length of the spring is :
Answer: (1)
Solution
The spring force provides the centripetal force: . So and $k(5) =
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