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Dane :
ΔT = 1*C
Q = 1800 J
Cw = 900 J/ kg*K
Szukane :
m = ?
Rozwiązanie :
Q = Cw * ΔT *m
m = Q / Cw * ΔT
m = 1800 / 900 * 1
m = 2 kg
zad. 2
Dane :
m = 2 kg
Tp = 0*C
ΔT = 100 *C
Szukane :
Q = ?
Rozwiazanie :
aby roztopic bryłę trzeba dosatrczyc energi, a pózniej jeszcze raz dostarczamy energii by ogrzać to ciało.
Ct = 330 kJ / kg = 330 000 J
Cw = 4200 J/kg*K
Q1 = Ct * m
Q2 = Cw * m * ΔT
Q1 = 330 000 * 2 = 660 kJ
Q2 = 4200 * 2 * 100 = 840 kJ
Q = Q1 + Q2
Q = 660 kJ + 840 kJ
Q = 1500 kJ = 1,5 MJ