일반물리학 1 · Temperature, Heat, and the First Law of Thermodynamics · Problem 20
일반물리학 1 — Temperature, Heat, and the First Law of Thermodynamics: Problem 20
20 The ceiling of a single-family dwelling in a cold climate is to have an R-value of 35. To give such insulation, how thick would a layer of (a) polyurethane foam and (b) silver have to be?
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