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URGENT!!COROANA!!! Problema 7.56

URGENTCOROANA Problema 756 class=

Răspuns :

Se da:
C=840J/K
m=2kg
t1=5°C
t2=55°C
Q=462kJ=462000J
c=?J/kg×K

Formule:
Q=Q1+Q2
Q=C×Δt+c×m×Δt
Q=C×(t2-t1)+c×m×(t2-t1)
c×m×(t2-t1)=Q-C×(t2-t1)
c=[Q-C×(t2-t1)]/[m×(t2-t1)]

Calcule:
c=[462000-840×(55-5)]/[2×(55-5)]=4200J/kg×K

Din tabel e aproximativ apa.