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A glass window 0.50 cm thick measures 89 cm by 38 cm .?
How much heat flows through this window per minute if the inside and outside temperatures differ by 14 ∘C ?
Express your answer using two significant figures.
2 Answers
- SpacemanLv 72 years ago
Heat Flow Rate Equation
k = thermal conductivity of glass window = 0.96 W/m·K
A = area of glass window = 89 cm x 38 cm = 0.89 m x 0.38 m = 0.3382 m²
ΔT = temperature difference = 14 °C
s = thickness of glass window = 0.50 cm = 0.005 m²
Q = heat flow = to be determined
Q = k·A·ΔT/s
Q = k·A·ΔT/s
Q = (0.96 W/m·K)(0.3382 m²)(14°C) / (0.005 m)
Q = 909 W = 909 J/s
t = elapsed time = 1 minute = 60 s
Qt = (909 J/s)(60 s) = 54,545 J ≈ 55 kJ (to 2 significant figures)
Source(s): https://study.com/academy/lesson/heat-transfer-thr... http://www.softschools.com/formulas/physics/heat_f... https://www.engineeringtoolbox.com/thermal-conduct... https://www.omnicalculator.com/math/sig-fig#what-a... https://www.engineeringtoolbox.com/conductive-heat... - Anonymous2 years ago
Of course it does. Of course it does.