Jawabanmu

2014-05-29T19:20:20+07:00
Pakai asas black. Itu kan sama2 air, jadi kalor jenis nya di coret saja spt :
Qlepas = Q serap
m. c. deltaT = m. c. deltaT
100 gr. (100-Tf) = 200 gr (Tf-40) -> c nya dicoret karena sama2 air. 
1. (100-Tf) = 2 (Tf-40)
100-Tf = 2Tf - 80
180 = 3 Tf
60 drjt = Tf

2014-05-29T19:20:39+07:00
M c Δt = m c Δt
100 c (100 - tc) = 200 c (tc - 40)
10000 -100tc = 200 tc -8000
-300 tc = -18000
tc = 60