Problems19

# Problems19 - Chapter 19 Problems 1, 2, 3 = straightforward,...

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Chapter 19 Problems 1, 2 , 3 = straightforward, intermediate, challenging Section 19.2 Thermometers and the Celsius Temperature Scale Section 19.3 The Constant-Volume Gas Thermometer and the Absolute Temperature Scale 1. A constant-volume gas thermometer is calibrated in dry ice (that is, carbon dioxide in the solid state, which has a temperature of –80.0°C) and in boiling ethyl alcohol (78.0°C). The two pressures are 0.900 atm and 1.635 atm. (a) What Celsius value of absolute zero does the calibration yield? What is the pressure at (b) the freezing point of water and (c) the boiling point of water? 2. In a constant-volume gas thermometer, the pressure at 20.0°C is 0.980 atm. (a) What is the pressure at 45.0°C? (b) What is the temperature if the pressure is 0.500 atm? 3. Liquid nitrogen has a boiling point of –195.81°C at atmospheric pressure. Express this temperature (a) in degrees Fahrenheit and (b) in kelvins. 4. Convert the following to equivalent temperatures on the Celsius and Kelvin scales: (a) the normal human body temperature, 98.6°F; (b) the air temperature on a cold day, –5.00°F. 5. The temperature difference between the inside and the outside of an automobile engine is 450 ° C. Express this temperature difference on (a) the Fahrenheit scale and (b) the Kelvin scale. 6. On a Strange temperature scale, the freezing point of water is –15.0°S and the boiling point is +60.0°S. Develop a linear conversion equation between this temperature scale and the Celsius scale. 7 . The melting point of gold is 1 064°C , and the boiling point is 2 660°C. (a) Express these temperatures in kelvins. (b) Compute the difference between these temperatures in Celsius degrees and kelvins. Section 19.4 Thermal Expansion of Solids and Liquids Note : Table 19.1 is available for use in solving problems in this section. 8. The New River Gorge bridge in West Virginia is a steel arch bridge 518 m in length. How much does the total length of the roadway decking change between temperature extremes of –20.0°C and 35.0°C? The result indicates the size of the expansion joints that must be built into the structure. 9. A copper telephone wire has essentially no sag between poles 35.0 m apart on a winter day when the temperature is –20.0°C. How much longer is the wire on a summer day when T C = 35.0°C?

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10. The concrete sections of a certain superhighway are designed to have a length of 25.0 m. The sections are poured and cured at 10.0°C. What minimum spacing should the engineer leave between the sections to eliminate buckling if the concrete is to reach a temperature of 50.0°C? 11. A pair of eyeglass frames is made of epoxy plastic. At room temperature (20.0°C), the frames have circular lens holes 2.20 cm in radius. To what temperature must the frames be heated if lenses 2.21 cm in radius are to be inserted in them? The average coefficient of linear expansion for epoxy is 1.30 × 10 –4 (°C) –1 .
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## This homework help was uploaded on 04/17/2008 for the course PHYS 1610 taught by Professor Entire during the Spring '08 term at Auburn University.

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Problems19 - Chapter 19 Problems 1, 2, 3 = straightforward,...

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