$2.$ Air in a piston$-$cylinder device undergoes three processes to complete a cycle. The

first process is constant pressure heat removal. The second process occurs at constant

volume and $78$ J of heat is added. The third process occurs at a constant temperature

of $700$ K$.$ The minimum volume during the cycle is $100$ cm$3$ and the maximum pressure

in the cycle is $500$ kPa. Determine the maximum and minimum temperatures in the

cycle and the net heat transfer. Air is an ideal gas with R $=287$ J$/($kg $$ K$).($answers: $700$ K$,279$ K$,15\mathrm{.}9$ J$)$