Jawabanmu

2014-04-19T16:41:18+07:00
Diketahui :
Q = 84 Kj =) 84000 Joule
m = 500 gram =) 0,5 Kg
t1 = 20°C
Kalor Jenis ( c ) = 4.200 J/(Kg.K)

Dit : t2 = ?

Penyelesaian :
t = Q/m . kalor jenis
( t2 - t1 ) = 8400/ 0,5 . 4200
( t2 - 20) = 40 
t2 = 40+20
t2 = 60°C
2014-04-19T16:47:19+07:00
Q=M.C.(T2-T1)
84000=0.5.4200.(T2-20)
84000=2100.(T2-20)
2100T2=42000+84000
T2 = 60 derajat celcius