ME330_S07_HWSet2 - ME 330 Fluid Mechanics Department of...

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ME 330 Fluid Mechanics Spring 2007 Department of Engineering Western Kentucky University CHAPTER 2 HW - Homework Solutions Problem #’s 2-1C, 2-2C, 2-3C, 2-8E, 2-14C, 2-38 2-43, 2-54, Due February 2, 2007 2-1C Solution We are to discuss the difference between intensive and extensive properties. Analysis Intensive properties do not depend on the size (extent) of the system but extensive properties do depend on the size (extent) of the system . Discussion An example of an intensive property is temperature. An example of an extensive property is mass. 2-2C Solution We are to define specific gravity and discuss its relationship to density. Analysis The specific gravity , or relative density , is defined as the ratio of the density of a substance to the density of some standard substance at a specified temperature (the standard is water at 4°C, for which ρ H2O = 1000 kg/m 3 ). That is, H2O / = SG . When specific gravity is known, density is determined from H2O × = SG . Discussion Specific gravity is dimensionless and unitless [it is just a number without dimensions or units]. 2-3C Solution We are to discuss the applicability of the ideal gas law. Analysis A gas can be treated as an ideal gas when it is at a high temperature and/or a low pressure relative to its critical temperature and pressure . Discussion Air and many other gases at room temperature and pressure can be approximated as ideal gases without any significant loss of accuracy.
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ME 330 Fluid Mechanics Spring 2007 Department of Engineering Western Kentucky University 2-8E Solution An automobile tire is under-inflated with air. The amount of air that needs to be added to the tire to raise its pressure to the recommended value is to be determined. Assumptions 1 At specified conditions, air behaves as an ideal gas. 2 The volume of the tire remains constant.
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This note was uploaded on 04/19/2008 for the course ME 330 taught by Professor An during the Spring '08 term at Western Kentucky University.

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ME330_S07_HWSet2 - ME 330 Fluid Mechanics Department of...

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