# Q9S - while keeping the quantity P (3 V V ) constant. a....

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Quiz 9 Solutions Check the best answer. 1. A container to keep liquids hot (or cold) consists of a bottle as shown, with a double wall. The space between the walls is a near vacuum, and the walls are made highly reFective by silvering. Which of the following is true? Check T or ± depending on whether the statement is true or false. 2. To increase the temperature of an ideal gas by the amount Δ T , the heat input required is the same regardless of the process used. T ± Vacuum Silvered Physics 53 Summer 2010 1 The silvering reduces heat transfer by conduction. The vacuum reduces heat transfer by radiation. The vacuum reduces heat transfer by conduction. The silvering reduces heat transfer by convection.

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3. One mole of an ideal gas ( c V = 3 2 R ) starts with pressure P 0 and volume V 0 . It is expanded to volume 2 V
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Unformatted text preview: while keeping the quantity P (3 V V ) constant. a. What is the Fnal pressure? b. ind the initial and Fnal temperatures and E int for the process. c. ind the work done by the gas and the heat input. [In Fnding the work, make the substitution x = 3 V V in the integral.] a. We have P 2 V = P V , or P = 2 P . b. The initial temperature is T = P V / R ; the Fnal temperature is T = 2 P 2 V / R = 4 T . This gives E int = c V T = 3 2 R 3 T = 9 2 P V . c. The work is W = 2 P V dV 3 V V V 2 V . Making the suggested substitution we have W = 2 P V dx x V 2 V = 2 P V ln(2) . The heat input is Q = E int + W = P V ( 9 2 + ln 2) . Physics 53 Summer 2010 2...
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## This note was uploaded on 10/19/2011 for the course PHYSICS 53L taught by Professor Mueller during the Spring '07 term at Duke.

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Q9S - while keeping the quantity P (3 V V ) constant. a....

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