Odpowiedzi

2010-01-22T14:59:03+01:00

Dane:
m = 2 kg
T₁ = 20⁰C
Q = 424 kJ = 42000 J
Cw = 4190 [J/kg × ⁰ C]
Szukane:
T₂ = ?
Rozw.:
Q = m × Cw × ΔT
Q = m × Cw × ( T₂ - T₁)
Q = m× Cw × T₂ - m× Cw × T₁
m× Cw × T₂ = Q + m× Cw × T₁
T₂ = Q + m× Cw × T₁ / m× Cw =
T₂ = 42000 J + 2 kg × 4190 [J/kg × ⁰ C]×20⁰C /
2 kg × 4190 [J/kg × ⁰ C] = 209600 J / 8380 J/⁰C = 25⁰C