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Homework 10

# Homework 10 - soto(rrs946 – Homework 10 – Spurlock...

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Unformatted text preview: soto (rrs946) – Homework 10 – Spurlock – (41003) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The tire on a bicycle is filled with air to a gauge pressure of 474 kPa at 20 ◦ C. What is the gauge pressure in the tire after a ride on a hot day when the tire air tempera- ture is 69 ◦ C? (Assume constant volume and a constant atmospheric pressure of 101 . 3 kPa.) Answer in units of kPa. 002 10.0 points Compressing gases requires work and the re- sulting energy is usually converted to heat; if this heat does not escape, the gas’s temper- ature will rise. This effect is used in diesel engines: The compressed air gets so hot that when the fuel is injected, it ignites without any spark plugs. As an example, consider a cylinder in a diesel engine in which air is compressed to one twentieth of its original volume while the pressure rises from 1 atm to 62 atm (absolute, not gauge). Note that because the air heats up while being compressed, its pressure rises more than twenty-fold. If the air is taken into the cylinder at 38 ◦ C, how hot does it get after being compressed? Answer in units of ◦ C. 003 10.0 points Gas is confined in a tank at a pressure of 8 atm and a temperature of 13 ◦ C. If 73 percent of the gas is withdrawn and the temperature is raised to 58 ◦ C, what is the new pressure in the tank? Answer in units of atm. 004 (part 1 of 3) 10.0 points The molecular mass of helium is 4 g / mol, the Boltzmann’s constant is 1 . 38066 × 10 − 23 J / K, the universal gas constant is 8 .....
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Homework 10 - soto(rrs946 – Homework 10 – Spurlock...

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