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2009-01-07 Physics - potential energy: The choice is arbitrary, and meant for mathematical convenience. You can use the center of the Earth if you want, it's just customary to use infinity. We calculate potential differences (there's no such...
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2009-01-07 Physics - maglev tech: First, a few questions for clarification: What does the "ir" in "maglev car ir train" mean? You and what group? Is this for a science fair, and if so, how long do you have to build something? There...
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2009-01-07 Physics - Solar Energy: Well, there are many ways this can be done. If you're trying to wire a small standard solar panel to a household light bulb, you're in for some disappointment...they just don't have the power to run one...
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2009-01-07 Astrophysics - Surface temperature in gray atmosphere: Hello, Okay, the key points - as I noted- were to assume: a) radiative equilibrium, and b) "LTE" or local thermodynamic equilibrium. Then, following the suggestions and method given in that problem...
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2009-01-07 Physics - Radiant Heat Shield: I don't have any information about the Thermo-Tec insulating mat because (I looked it up) they don't give a lot of specifics. The shiny aluminized mylar side should face the hot parts whose heat you wish...
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