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Laws of thermodynamics
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A football was inflated with air at a pressure of 13 psig (as required by NFL rules) in a room where temperature was 72°F and pressure was 14.5 psi. It was then taken to an open field where refere
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Laws of thermodynamics
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The filament of a light bulb is cylindrical with length l = 20 mm and radius r = 0.05 mm. The filament is maintained at a temperature T = 5000 K by an electric current. The filament behaves \approx imately as a black body, emitting radiation isotropically.
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