The work done by a spring is changing or constant?

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

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

Asher cycles 12 miles in 16 hours. what is his speed?