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m = 1 kg
c=4200 j/kg c
Δt=t2-t1
=100-30=70 c
u=2270000
dijawab
Q a-c=Q a-b+Q b-c
=m.c.Δt+m.u
1.4200.70+1.2270000
=294000+2270000
=2564000 j
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