In hooke's law, what does k represent? a.) the length of the spring b.)the mass of the spring c.)the stiffness of the spring d.)the thickness of the spring

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

Can anybody me with this? ? (picture included.)

How many neutrons does plutonium -196 with an atomic number of 78.