T3B1 I cant seem to figure out the work put into the gas F O

T3B.1. I can\'t seem to figure out the work put into the gas

F. Other (specify) HOMEWORK PROBLEMS Basic Skills T3B.1 A gas is confined to a cylinder by a piston. The gas has an initial pressure of 120 kl\'a and a volume of 100 cm The piston is slowly moved back until the gas\'s vol- ume has increased by 0.5%. What is the approximate work that flows into or out of the gas? (Be sure to give the correct sign as well as the correct magnitude. You can consider this volume change to be small enough that P is approximately constant during the process.) r3B.2 A gas is confined to a cylinder by a piston. The gas has an initial pressure of 95 kPa and a volume of

Solution

pressure , P = 120 kPa

VOlume , v1 = 100 cm^3

final volume , V2 = ( 1 - e) * v1

V2 = (1 - 0.5 * 10^-2) * 100

v2 = 99.5 cm^3

work done into the gas = P * (v2 - v1)

work done into the gas = 1.20 *10^5 * (100 - 99.5) * 10^-6

work done into the gas = -0.06 J

Here workdone into the gas, so workdone is negative.