Jawabanmu

2014-04-27T13:44:05+07:00
Q= m x c x Δt
= 2 x 4200 x (80-20)= 504000
Q= 504000
keterangan 
Q= Kalor
m= massa
c= kalor jenis

2014-04-27T14:08:47+07:00
Q = m × c × deltaT Q = 2 kg × 4200 j/kg ·c × 60 Q = 504000 Joule