Jawabanmu

2014-04-17T21:43:14+07:00
Q = mcdt
84000 = 0.5*4200(t-20)

T-20 = 84000/2100 = 40

T = 40+20 = derajat celcius

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2014-04-17T21:43:51+07:00
Dik :Q = 84 Kj =) 84000 Joule
m = 500 gram =) 0,5 Kg
t1 = 20°C
c = 4.200 J/(Kg.K)

Dit : t2 = ?

Penyelesaian :?
t = Q/m x kalor jenis( t2 - t1 )
= 8400/ 0,5 x 4200( t2 - 20)
= 40 t2 = 40+20
t2 = 60°C
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