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m = 3kg
t1 = 20'c
t2 = 80'c
c besi = 460 J/Kg'c
Dit: Q........?
Q = m . c . (t2-t1)
Q = 3 x 460 x (80-20)
Q = 3 x 460 x (60)
Q = 82800J
Q = 82,8 Kilo J