Lily has designed an experiment that tests one variable. She will drop two balls of the same size but with different masses. She will drop each from a height of two meters at exactly the same time. What variable is Lily testing in her experiment

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat