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...........
c = 4200 J/Kg^c
t1 = 20 ^c
t2 = 100 ^c
Dit : Q = ...?
Penyelesaian :
Q = m x c x Δt
= 5 x 4200 x (100-20)
= 5 x 4200 x 80
= 1680000 J
= 1680 KJ