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HW__2_P2213_F08 - 2[Designing a Heat Conductor You are...

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Physics 2213 Homework #2 Fall 2008 Read: Chapter 17.5 – 17.7; Chapter 18.1 – 18.3 For study: Q #17.6, 8, 12, 14, 15, 16, 17, 18, 19, 23, 28; (not quizzed) Q #18.14, 18, 20, 22; E's & P's #17.33, 35, 39, 41, 45, 59, 69, 71, 101, 113; #18.36 To be prepared for your 2nd discussion section the week of September 8-12: #18.30 [Mixed Gases] #18.37 [Oxygen Molecules] #17.95 [Spacecraft Reentry] #17.110 [Layers of Insulation] #17.67 [Exterior Walls] #17.77 [Light Bulb Filament] #1. [Cooling a Soda] A thermally insulated cup contains 0.50 kg of soda (essentially water) at a temperature of 25° C. What mass of ice (originally at 0° C) should be added to the cup so that its contents will come to thermal equilibrium at 10° C?
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Unformatted text preview: # 2. [Designing a Heat Conductor] You are asked to design a cylindrical steel road 1.00 m long, with a circular cross section, that will conduct heat from a furnace at 400 ° C to a container of boiling water under one atmosphere. The boiler must produce steam at a rate of 1 g/sec. What must the rod’s diameter be? #3. [Solar Power] The intensity of solar radiation reaching the Earth’s upper atmosphere is about 1370 W/m 2 (the solar constant ). (a) Based on this value, what is the total power output of the Sun? Please be sure your reasoning is clear. (b) Assuming that the Sun’s emissivity is equal to 1, compute the surface temperature of the Sun. [ HINT : Possibly useful information may be found in the Astronomical Data table on page A8 in Appendix F at the back of your textbook.]...
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