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Lo = 100 cm
α = 1.9 x /C
dit = L ?
jwb = ΔL = Lo . α .ΔT
= 100 cm . 1,9 x /C . 135
= 1,9 x . 135
=0.2565 cm
L = Lo + ΔL
= 100 + 0.2565
=100.2565 cm (a)
6. dik =>
ΔT = 30-0 = 30
Q = 2.25 X J
C = 600 J/kg
dit = m..?
jwb =
Q = m . c .ΔT
2.25 X = m . 600 J/kg . 30
22500 = 18000 . m
m =
m = 1,25 kg (e)
7. dik = m k = 230 g
Tk = 90
m s = 20 g
Ts = 5
ck = cs = 1 kal/grC
dit = T
jwb =
Q=Q
m.c.ΔT = m.c. ΔT
230 . 1 . (90 - T ) = 20 . 1 ( T - 5)
20700 - 230T = 20T - 100
20700 + 100 = 20T + 230T
20800 = 250 T
T=
T = 83.2 C
suhu akhir = 83.2 derajat celsius (d)
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