Two children push on heavy crate that rests on a basement floor. one pushes horizontally with a force of 150 n and the other pushes in the same direction with a force of 180 n. the crate remains stationary. show that the force of friction between the crate the floor is 330 n.

Asample of a gaseous substance changes into a liquid

An architect plans to use solar energy to heat the next house he designs. what principle of absorption and infrared energy can be applied to the design of the new house? how could she apply to those principals?

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.