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45000J=1/2kg×900J/kg*c×∆t
45000=450∆t
45000:450=∆t
10=∆t
Suhu akhir =30°+10=40°C
Q = m.c.Ta-T
Ta = Suhu akhir
T = Suhu Awal = 30
c = 900
Q = 45000 (dari kilo ke joule)
m = 0,5 ( dari gram ke kilo )
45000 = 0.5 x 900 x Ta - 30
45000 = 450 x Ta - 30
45000 : 450 = Ta - 30
100 = Ta - 30
100 + 30 = Ta
jadi Suhu akhir 130 C