Suppose you have a solid sphere of aluminum that is the size of a golf ball, and a solid sphere of aluminum the size of a softball. which one has the greater density?

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.

J. j. thomson’s experiment disproved the theory that an atom

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?