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= 2.460.(70-20)
t1 = 20 derajat c
t2 = 70 drjt c
Δt = t2 - t1 = 70-20=50 derajat c
c = 460 j/kg
tanya : Q
jwb ; Q = M . c. Δt
= 2 . 460 . 50
= 46000 j