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42000=0,2×4200×(t2-25)
(t2-25)=42000÷4200×0,2
(t2-25)=10×0,2
(t2-25)=2
t2=25+2
t2=27
T1 = 25'c
Q = 42.000 J
c = 4.200 J/kg'C
Dit ; T2 ?
Jwb :
ΔT = Q / m.c
(T2 - T1) = Q / m.c
(T2 - 25'C) = 42.000 J / 0,2 kg . 4.200 J/kg'C
(T2 - 25'C) = 50'C
T2 = 50'c + 25'c = 75'C
maaf ya kalau salah