Odpowiedzi

2010-01-18T13:37:14+01:00
Dane:
m₁ = 10 kg
T₁ = 60⁰C
T = 40⁰C
T₂ = 10 ⁰C
m₂ = ?


Rozw.:

Q₁ = m × Cw × ΔT
ΔT= T₁ -T
Q₁ = m₁ × Cw × ( T₁ -T)
Q₂ = m₂ × Cw × ΔT
ΔT= T -T₂
Q₂ = m₂ × Cw × ( T -T₂ )

Q₁ = Q₂
m₁ × Cw × ( T₁ -T) = m₂ × Cw × ( T -T₂ )
m₁ × ( T₁ -T) = m₂ × ( T -T₂ )
m₂ = m₁ × ( T₁ -T) / ( T -T₂ ) = 10kg×(60⁰C-40⁰C)/(40⁰C-10⁰C) = 6,66 kg