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vit = mcΔT
2400 t = 20 x 4200 x 90
t = 20 x 4200 x 90 / 2400 = 3150 s
13. a. Q = mcΔT = 1,5 x 4200 x 80 = 504000 J
b. S = Q / t = 504000 / (3,5 x 60) = 2400 w
c. R = v² / S = 220² / 2400 = 20,17 Ω
14. S1 = 600 w
S2 = 900 w
t1 = 2 x 60 s
t2 = 5 x 60 s
m1 = 0,6 kg
m2 = 0,6 kg
ΔT1 = 20
ΔT2 = ....?
S1 t1 = m1 c ΔT1
S2 t2 = m2 c ΔT2
ΔT2 = m1 c ΔT1 S2 t2 / m2 c S1 t1
= (0,6 x 20 x 900 x 5 x 60) / (0,6 x 600 x 2 x 60) = 75 °C