A spring has a force constant of 100 nm and an unstretched, Ask an Expert

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A spring has a force constant of 100 N/m and an unstretched length of .07 m. One end is attached to a post that is free to rotate in the center of a smooth table. The other end is attached to a 1 kg disc moving in uniform circular motion on the table, which stretches the spring by .03 m. Friction is negligible. What is the centripetal force on the disc? A. .3 N B. 3N C. 10 N D. 300 N E. 1,000 N

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