Jawabanmu

2014-04-13T20:26:28+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 :

Δt = Q/m . kalor jenis
( t2 - t1 ) = 8400/ 0,5 . 4200
( t2 - 20) = 40 
t2 = 40+20
t2 = 60°C
2014-04-13T20:27:32+07:00
Q= mcΔt
84000= 0,5 × 4200 ×Δt
Δt= 84000÷ (0,5 ×4200)
= 40

Δt= suhu akhir- suhu awal
40= t- 20
t=60