Which physical property is best measured using only a balance? A. Density B. Volume C. Color D. Mass

You are sitting on the beach and wondering about the properties of mechanical waves. describe them in terms of ocean waves.

Observations show that interstellar clouds can have almost any shape and

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.