Odpowiedzi

2010-02-06T09:31:31+01:00
Dane:
m₁ = 0,2 kg
T₁ = 1200⁰C
T = 90⁰C
T₂ = 20 ⁰C
Cw₁ = 450 [J/kg ×⁰C]
Cw₂ = 4190 [J/kg ×⁰C]
m₂ = ?

Rozw.:
Q₁ = m × Cw₁ × ΔT
ΔT= T₁ -T
Q₁ = m₁ × Cw₁ × ( T₁ -T)
Q₂ = m₂ × Cw₂ × ΔT
ΔT= T -T₂
Q₂ = m₂ × Cw₂ × ( T -T₂ )
Q₁ = Q₂
m₁ × Cw₁ × ( T₁ -T) = m₂ × Cw₂ × ( T -T₂ )
m₂ = m₁ × Cw₁ × ( T₁ -T) / Cw₂ × ( T -T₂ )
m₂= 0,2kg× 450 [J/kg ×⁰C]×(1200⁰C-90⁰C)/ 4190[J/kg×⁰C]×(90⁰C-20⁰C)
m₂= 0,34 kg
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