$[3\mathrm{.}36/10$ Points$]$

THERMODYNAMICS: PV DIAGRAM $-$ WORK FROM AREA

Content

Remember the following pertaining to PV diagrams:

$P($pressure$)$ is on the vertical axis.

V $($volume$)$ is on the horizontal axis.

$W$ is the area under the curve. If the volume is increasing, $W$ is positive. if the volume is decreasing, $W$ is negative.

For cycles, W is the enclosed area. If the cycle is going clockwise, W is positive. If the cycle is going counterclockwise, W is negative.

$U=0$ for a cycle.

Part $1$: Trapezoid

Shown below is the PV$-$diagram for a clockwise cycle. Determine the work done during the cycle, the heat flow during the cycle, & the change in internal energy during the cycle.

$W=$

$Q=$

$U=$

Part $2$: Circle

Shown below is the PV$-$diagram for a clockwise cycle. Determine the work done during the cycle, the heat flow during the cycle, & the change in internal energy during the cycle.

$w=$

$Q=$

$U=$