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Test 1 4c0102

Test 1 4c0102

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Physics 4C0102 Spring 2021 Test 1 Student Name: Total points: 90 Time allowed: 90 minutes Instructor: Eva Low Physical constants: Universal gas constant R = 8.314 J/kgK. Boltzman constant kB = 1.38 x 10-23 m2kg/s2K Avogadro’s number Na = 6.022 x 1023 /mol Stefan-Boltzman constant σ = 5.67 x10-8 W/m2K4 Specific Heat of Water = 4186 J/kgK Specific Heat of ice = 2090 J/kgK Specific Heat of copper = 384 J/kgK Latent heat of fusion of water = 3.35x10 5 J/kg Latent heat of vaporization of water = 2.26x10 6 J/kg Molar mass of helium: 4g Molar mass of nitrogen: 28g. 1 atm = 101.3 kPa = 14.7 psi 1 psi = 6894. 76 pa 1 liter = 1000 cm3 = 10-3 m3 1. The table below contain thermal properties of various materials. Choose the material best suited for each task shown below based on their thermal properties listed in the table. (10 points) (a) Used together with water as an automotive engine coolant where the operating temperature can reach over 1000C. (b) The fluid used in glass thermometer to measure body temperature. (c) Keys for doors. (d) The wire filament used in incandescent light bulb where operating temperature can reach over 30000C. (e) Substance (in liquid form) used as a coolant for superconductors that has an operating temperature of -2000C. Material Helium Nitrogen Water Alcohol Mercury Glycerin Gasoline Glass Brass tungsten Melting/ Boiling Freezing point point (0C) 0 ( C) -270 -210 0 -114 -38.83 -38 < -40 1500 930 3422 -267 -196 100 78.4 356.7 290 50 2230 1100 5555 ...
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