Bantu secepetnya ya
q lepas = q terima
maka..
m . c . (tc - t1) = m . c . (t2 - tc)
m1 = 0,5kg
m2 = 90g (0,09kg)
c benda = 504j/kg°c
c air = 4200j/kg°c
t2 = 30°c
tc = 78°c
jawab :
0,5 . 504 . (78 - t1) = 0,09 . 4200 . (30 - 78)
252 . (78 - t1) = 378 . (-48)
19.656 - 252t1 = -18.144
19.656 + 18.144 = 252t1
37.800 = 252t1
t1 = 37.800/252
t1 = 150°c
suhu benda mula - mula nya adalah 150°c
