Which of the following is an example of potential energy?
A. A pottery wheel spinning with the clay on it spinning too
B. A rubber band is stretched out
C. Two children running
D A train moving across the railroad track

How does the space charge width change with forward and reverse bias? also, calculate the space charge width for a reverse bias of 4v on a silicon pn junction at t = 300k and doping concentrations of na = 5x1015cm-3 , nd = 5x 1016 cm-3 .

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

Amira pulls a 3 pound wagon 4 feet. how much work has she done?