How do microwaves help heat frozen food? А
The waves filter ice from food.
B
The waves block coldness in food.
с
The waves kill germs in food.
D
The waves are absorbed by water in food.

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.