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Q. A spring has a force constant of 254 N/m and an unstretched length of 9 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.

Q. An uncharged capacitor is connected to a 55.0-V battery until it is fully charged, after which it is disconnected from the battery. A slab of paraffin is then inserted between the plates.

K_paraffin = 2.2

a) What will now be the voltage between the plates?
b) Find the change in energy stored in the capacitor?

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