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• Energi
gas monoatomik
V = 10^-2 m³
p = 6,2×10^5 Pa
P = 200 W
∆U = W
Persamaan keadaan gas ideal
p V = N k T
Energi dalam gas
∆U = N (3/2) k T
∆U = (3/2) p V
Energi yang dihasilkan mesin
W = P t
W = ∆U
P t = (3/2) p V
t = (3/2) p V / P
t = (3/2) (6,2×10^5) (10^-2) / 200
t = 46,5 s ← jwb
p.gas = 6,2 x Pa
P.mesin = 200 watt
ditanya : t.mesin
w.mesin = Δu.gas
P.mesin .t.mesin = 3/2 p.gas . v.gas
200 .t.mesin = 3/2 . 6,2 x x 0,01
200 .tmesin = 9,3 x 10³ .... bagi dengan 100
2 .t.mesin = 93
t.mesin = 93/2
= 46,5 s