A cylinder is oriented vertically. A massless, frictionless piston inside the cylinder sits atop two stops that

prevent it from moving any further down the containing cylinder. The stops do not, however, prevent

the piston from moving upward in the cylinder. Below the piston is $4kg$ of water, $50\%$ of which $($by

mass$)$ is initially vapor at $120C.$ Heat is gradually added to the water until the water reaches a final state

of $400C.$ The atmospheric pressure is $400$kPa. Assume the stops do not cover an appreciable fraction of

the piston's facial area.

A$.$ Draw this process on a $P-v$ diagram. Include the isotherms at states $1$ and $2.$

B$.$ At what temperature, $T_{\text{l}\text{i}\text{f}\text{t}\text{o}\text{f}\text{f}\text{,}},$ does the piston first lift off the stops? Mark this state on your P$-$v

diagram as "liftoff."

C$.$ At what temperature, $T_{\text{v}\text{a}\text{p}\text{o}\text{r}\text{,}},$ has all the liquid turned into vapor? Mark this state on your P$-$v

diagram as "vapor."

D$.$ Find the net work and heat transfer between the system and the surroundings between states $1$

and $2,W_{12,\text{n}\text{e}\text{t}}$ and $Q_{12,\text{n}\text{e}\text{t}}.$ Be sure to indicate if these net energy transfers are into or out of the

system.

plz solve correctly and completely $.$ iI need c complete solution and answer $.$ iI will thumb up $.$ thanks