Jawabanmu

2014-03-04T22:41:31+07:00
 Q = 84 kJ = 84000 J, m = 500 gram = 0,5 kg, t1 = 20 C = 293 K. c= 4200 J/(kg.K)
Q = mcΔt
Q =  m c (t2-t1)
t2 - t1 = Q / (m . c)
t2- 293 = 84000 /(0,5 . 4200)
t2 - 293 = 84000/2100
t2= 40 + 293 = 333 K = 60C
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