What is the pressure resulting from a gas filling a cubic box with 19.8 m length each side, and filled with 55 moles of gas atoms

Assume that our gas constant is R = 8.315 J/Kmol, and our gas is at room temperature, which is T = 300 K

Anne applies a force on a toy car and makes it move forward. what can be said about the forces acting on the toy car at the moment anne applies the force?

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?