Two moles of an ideal gas occupy a volume V. The gas expands isothermally and reversibly to a volume 3V. (a) Is the velocity distribution changed by the isothermal expansion? Explain. (b) Use Eq. (20.23) to calculate the change in entropy of the gas. (c) Use Eq. (20.18) to calculate the change in entropy of the gas. Compare this result to that obtained in part (b).

Chapter8:Momentum Onewayofhandlingcollisionsistheconceptof“impulse” *workisfoundbymultiplyinganappliedforcebythetimeoverwhichit acts. Impulseistheproductoftheforceandtimeintervaloverwhichitacts. = ▯▯▯∆ ▯▯▯ = *Impulsepointsinthesamedirectionastheappliedforce *netforceisjusttheappliedforce = ▯▯▯ ∆ = ▯▯▯∆ = ∆ − = ▯ ▯ ∆ ∆