What is the relationship between potential energy, kinetic energy, and speed as the skater moves down and up the u-shaped ramp?

Asample of a gaseous substance changes into a liquid

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

Explain earth's motion, using the terms "precession" and "rotation" in your answer.