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Q=40×4.200×1/5
=4.200×8
=33.600 joule
m= 200 gram = 0,2 kg
Δt = t2 - t1 = 70 - 30 = 40 derajat celcius
Q = 0,2 . 4,2 × 10³ . 40
Q = 33600 J = 33,6 kJ