Steel Tea Kettle

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Posted by Rachel | Posted in Tea and Accessories | Posted on 31-10-2008

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steel tea kettle
Thermodynamics are difficult?

The burner on an electric heater has a power of 2 kW. A 660 g stainless steel kettle filled with water is 20 degrees C and placed on the burner and hot. If it takes 2.60 minutes for the water to boil, what volume of water in cm ^ 3, was in the boiler? Stainless steel is mostly iron, so you can assume is the specific heat of iron.

Assuming no losses (if you believe in Santa … but we have chice) Pin = 2E3W T1 = 20 + K (0 ° C) T2 = 100 K (0 ° C) T2-T1 = 80 K t = 2.60 x 60 = 156 Q s = t = Pin X156 2E3 = Q = (m1Cp ( H2O) + m2Cp (Fe)) (T2-T1) Q = Pt = 2,000 x 156 = 3.12 E 5 J m1 = [Q / (T2-T1) - M2Cp (Fe)] / (Cp (H2O) where Cp (Fe) = 450 J / kg K Cp (H2O ) E 3 = 4181 J / kg K m1 = E [3.12 5 / (80) - 0.6 x 450] / 4181 E 3 m1 = 0.87 kg

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