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# In figure 204 a gas initially at p 1 v 1 is caused to

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18) In Figure 20.4, a gas initially at P 1 , V 1 is caused to change its volume and pressure reversibly such that it moves along the path sketched here. In one cycle the net work done by the gas is thus A) V 2 (P 2 - P 1 ) B) P 2 V oe 2 - P 1 V 1 C) (P 2 - P 1 ) (V 2 - V 1 ) D) P 2 (V 2 - V 1 ) E) P 1 V 1 19) Twenty moles of a monatomic ideal gas ( g = 5/3) undergo an adiabatic process. The initial pressure is 400 kPa and the initial temperature is 450 K. The final temperature of the gas is 320 K. The change in the internal energy of the gas, in kJ, is closest to: 3

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20) Which of the following is a WRONG statement? (p + an 2 V 2 )(V - nb) = nRT, the term an 2 /V 2 is introduced to account for attractive interactiong between gas molecules. 21) A 1.8 L volume of neon gas (monatomic) is at a pressure of 4.0 atmospheres and a temperature of 440 K. The atomic mass of neon is 20.2 g/mol. In this situation, the temperature of the gas is increased to 540 K and the volume is increased to 3.8 L. The final pressure of the gas, in atmospheres, is closest to: 22) Which of the following is a WRONG statement? A) The ideal gas law implies that at zero temperature, an ideal gas must have either zero volume or zero pressure. B) Filling a cavity in a house wall with styrofoam beads is likely to provide better thermal insulation because styrofoam suppresses convection of air. C) If the diameter of a circular slab is doubled, its thermal conductivity is doubled, its thickness is doubled, and the temperature difference across the slab is left unchanged, the heat-flow rate through the slab will double. D) A constant-volume gas thermometer measures the absolute pressure of the gas and converts it into absolute temperature. E) Specific heat of a material (in SI units) is the heat capacity of 1 kg of the material. 23) A 8.2 kg solid sphere, made of metal whose density is 2300 kg/m 3 , is suspended by a cord. When the sphere is immersed in a liquid of unknown density, the tension in the cord is 23 N. The density of the liquid is closest to: Figure 14.5 24) In Figure 14.5, fluid fills the container shown here. At which of the indicated points is the pressure greatest? 4
25) Water flowing through a pipe suddenly comes to a section of pipe where the pipe diameter decreases to 70% of its previous value. If the speed of the water in the larger section of the pipe was 60 m/s, what is its speed in this smaller section? 5

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Answer Key Testname: FINAL SPRING 10 1) A 2) B 3) D 4) C 5) D 6) A 7) D 8) D 9) A 10) E 11) C 12) A 13) B 14) D 15) B 16) D 17) C 18) C 19) C 20) D 21) C 22) C 23) C 24) E 25) B 6
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In Figure 204 a gas initially at P 1 V 1 is caused to...

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