Jawabanmu

2014-05-08T14:23:31+07:00
M.c.DT = m.c.DT
(c dicoret)
30.(80-x)=70.(x-20)
2400-30x=70x-1400
3800=100x
38    = x
2014-05-08T15:07:16+07:00
Dik:
M1 = 70 g = 0,07kg
C = 4200 J/Kg oC
T1 = 20 oC
M2 = 30 g = 0,003 kg
T2 = 80 oC
Dit:
Takhir = ?
Dij:
Qlepas = Qterima
M.C.ΔT = M.C.ΔT
0,07.4200.ΔT = 0,03.4200.ΔT
0,007.ΔT = 0,003.ΔT
7.ΔT = 3.ΔT
7 (? - 20 ) = 3. (80 - ?)
7? - 140 = 240 - 3?
7? + 3? = 240 + 140
10? = 380
? = 380/10
? = 38
SUHU AKHIR CAMPURAN TERSEBUT ADALAH 38 o C
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