1. Which of the following describes electric potential energy? A. The capacity for doing work which arises from position or configuration. B. The amount of work needed to move a unit charge. C. Electric potential per unit charge. D. Charge per unit distance. 2. What is the standard SI unit for electric potential energy? A. Joules В. Volt C. Coulomb D. Ampere 3. In which situation would the system have the most electric potential energy? A. Initial, more energy when together. B. Initial, more energy when apart. C. Final, more energy when together. D. Final, more energy when apart. 4. What is the potential energy if a +4 nC charge moves from infinity to point A, 5 cm away from a +3 µC charge? Initial Final A. 1.35 X 10-3 J В. 2.16 х 10-з J С. 3.43 х 10-2J D. 4.12 x 10-2 J 5. Which of the following is not an example of electric potential energy? A. An incandescent light bulb is turned off. B. A cell phone that is turned off. C. A television that is turned on. D. Solar cells at night.

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.