A spring has a force constant of 595 N/m and an unstretched length of 6 cm. One end is attached to a post that is free to rotate in the center of a smooth table, as shown in the top view below. The other end is attached to a 7 kg disk moving in uniform circular motion on the table, which stretches the spring by 1 cm.What is the centripetal force Fc on the disk? Answer in units of N.