An electric water heater is delivering hot water at 50 C. The cold water enters the water heater at 10 C. The volume of the water heater is 160L and one fourth of the tank volume is cold water when the 5 kW electric heating element turns on. Once the heating element turns on, the internal energy of the water tank is a. Increasingb. Decreasingc. Constant

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.

What is a subatomic particle with a negative charge and very little mass?