1) A capacitor is a device that is used to store up electrical potential energy. It consists of three parts sandwiched tightly together. Charges from one of the outer pieces are pumped around the circuit onto the other outer layer. In order for the capacitor to be able to build up as much potential as possible, what type of material should the outer layers be made of? (4 points)
A conductor
An insulator
A radiator
A semiconductor

2) A pendulum takes 34.6 seconds to complete 10 full swings. What is the length of the pendulum? (4 points)
0.859 m
2.97 m
5.51 m
5.94 m

3) Study the following diagram for a thin lens.

If the object is arrow A, which of the following would correctly describe arrow B? (4 points)
Virtual, non-projectable, and inverted
Real, projectable, and inverted
Virtual, projectable, and inverted
Real, non-projectable, and inverted

4) A flower is placed at a distance of 7.0 cm in front of a thin lens. The image distance is 12 cm. What is the focal length of the lens? (4 points)
3.6 cm
4.4 cm
5.1 cm
5.7 cm