Sam records the temperatures of two cups of ice. Which best explains why the temperatures stop changing after several hours? A. One cup has given all of its heat energy to the other cup.
B. Each cup reaches the same temperature as the other cup.
C. The two cups reach the same temperature as the surrounding air.
D. All of the ice melts in the two cups, so their temperatures stop changing.

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.