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m = 2 kg
t1 = 30'c
t2 = 80'c
at = t2 - t1 = 80'c - 30'c = 50'c
Q = 42000 J
Ditanya: Kalor jenis (c)...?
c = Q/m.at
c = 42000/2.50
c = 42000/100
c = 420 J/Kg'c
42000 = 2 . 50 .c
c= 42000/100
=420