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11 April, 23:42

A glass window 0.33 cm thick measures 87 cm by 36 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.

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  1. 12 April, 01:48
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    6.38 x 10^4 J

    Explanation:

    d = 0.33 cm = 0.33 x 10^-2 m, Area = 87 x 36 cm^2 = 0.87 x 0.36 m^2

    ΔT = 14 degree C, t = 1 min = 60 second

    K = 0.8 W / m K

    Heat = K A ΔT t / d

    H = 0.8 x 0.87 x 0.36 x 14 x 60 / (0.33 x 10^-2)

    H = 6.38 x 10^4 J
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