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Q = 84 kJ = 84000 J
T1 = 30°C
c = 4200 J/kg°C
Q = 84000
m . c . ΔT = 84000
500 . 4200 . (T2 - 30) = 84000
2100000 . (T2 - 30) = 84000
T2 - 30 = 84000 : 2100000
T2 - 30 = 0,04
T2 = 0,04 + 30
T2 = 30,04°C
m = 500 kg
c = 4200 J/(kg °C)
Q = 84 kJ = 84000 J
t1 = 30 °C
t2 = __?
Q = m c ∆t
84000 = 500 • 4200 • ∆t
20 = 500 • ∆t
∆t = 0,04 °C
∆t = t2 - t1
0,04 = t2 - 30
t2 = 30,04 °C ← jwb
Benar datanya ?
Air 500 kg itu setengah ton !!
Kalau m = 500 gr = 0,5 kg
diperoleh ∆t = 40 °C dan t2 = 70 °C.