What do scientists use to represent force?

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

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.

When an object is heated it contracts. a. true b. false