An iron cauldron weighing 1.5 kg is filled with 5 kg of water. How much heat is needed to heat water
| August 1, 2021 | education
An iron cauldron weighing 1.5 kg is filled with 5 kg of water. How much heat is needed to heat water from 15 * C to 100 * C.
Given: m1 = 1.5 kg; m2 = 5 kg; t0 = 15 ºC; t = 100 ºC; Szh = 460 J / (kg * K); Sv = 4200 J / (kg * K).
Q = (Szh * m1 + Cw * m2) * (t – t0) = (460 * 1.5 + 4200 * 5) * (100 – 15) = 1 843 650 J ≈ 1.84 MJ.
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