In process a, a box with perfectly insulating walls is separated into two halves, each of volume v , by a thin wall. in the left half of the box is a monatomic ideal gas at temperature t ; in the right half is a vacuum. in process a you punch a small hole in the dividing wall and let the gas escape into the vacuum. the outer walls of the box remain insulating. after equilibrium is reached between both sides of the box, what is the final temperature?