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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 gass 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003 10.0 points Gas is confined in a tank at a pressure of 8 atm and a temperature of 13 C. If 73 percent of the gas is withdrawn and the temperature is raised to 58 C, what is the new pressure in the tank?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 Boltzmanns constant is 1 . 38066 10 23 J / K, the universal gas constant is 8 .....
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This note was uploaded on 11/10/2011 for the course PHYSICS 303L taught by Professor Hoffman during the Fall '11 term at University of Texas at Austin.
- Fall '11