Física volume único - Parte 99

R24 n = 2 mols R = 8 J/mol.K Tc = 77 °C Ta = 350 K pV = nRT p'V' = 2 mol * 8 J/mol.K * 350 K p'V' = 2 * 8 J * 350 p'V' = 5600 J ŧ = 2p' * V' ŧ = 2p'V' ŧ = 11200 J ŧ = 1,12 * 10⁴ J [a] Segundo princípio da termodinâmica r = ŧ/Q1 ŧ = Q1 - Q2 r = (Q1 - Q2)/Q1 r = Q1/Q1 - Q2/Q1 r = 1 - Q2/Q1 Q2/T2 = Q1/T1 r = 1 - T2/T1 A26 Q2 = 240 J Q1 = 300 J ŧ = Q1 - Q2 ŧ = 300 J - 240 J ŧ = 60 J r = ŧ/Q1 r = 60 J/300 J r = 20/100 r = 0,2 A27 r = 60% Q1 = 800 J a) r = ŧ/Q1 60/100 = ŧ/800 J ŧ = 60/100 * 800 J ŧ = 480 J b) Q2 = 320 J A28 T1 = 500 k T2 = 400 k T2/Q2 = T1/Q1 T2/T1 = Q2/Q1 r = 1 - T2/T1 r = 1 - 400 k/500 k r = 20/100 r = 20% A29 Dt = 4 s Pu = 500 W Pu = 500 J/s T1 = 500 K T2 = 300 K r = 1 - T2/T1 r = 1 - 300 K/500 K r = 40/100 r = 40% ŧ = 2000 J r = ŧ/Q1 Q1 = ŧ/r Q1 = 2000 J * 100/40 Q1 = 5000 J Q2 = 3000 J A30 T1 = 400 K T2 = 300 K ŧ = 80 J Q1 = 200 J r = 1 - T2/T1 r = 1 - 300 K/400 K r = 25/100 r = 25% r = ŧ/Q1 r = 80 J/200 J r = 40/100 r = 40% V27 Q1 = 500 J Q2 = 400 J ŧ = Q1 - Q2 ŧ = 100 J r = ŧ/Q1 r = 100 J/500 J r = 20/100 r = 20% V28 r = 4/10 Q2 = 120 J a) r = ŧ/Q1 ŧ = Q1r ŧ = Q1 - Q2 Q1r = Q1 - Q2 4Q1/10 = Q1 - 120 J 2Q1 = 5Q1 - 600 J 3Q1 = 600 J Q1 = 200 J ŧ = 80 J b) Q1 = 200 J V29 Q1 = 600 K Q2 = 300 K r = 1 - Q2/Q1 r = 1 - 300 K/600 K r = 50/100 r = 50% V30 T1 = 400 K T2 = 300 K Q1 = 600 cal 1 cal = 4,18 J Q1 = 2508 J r = 1 - T2/T1 r = 1 - 300 K/400 K r = 1/4 r = 25/100 r = ŧ/Q1 ŧ = rQ1 ŧ = 2508/4 J ŧ = 627 J ŧ = Q1 - Q2 Q2 = Q1 - ŧ Q2 = 2508 J - 627 J Q2 = 1881 J V31 T1 = 625 K T2 = 250 K Pu = 2400 W Pu = 2400 J/s t = 0,25 s ŧ = 600 J a) r = 1 - T2/T1 r = 1 - 250 K/625 K r = 60/100 r = 60% b) r = ŧ/Q1 Q1 = ŧ/r Q1 = 600/0,6 J Q1 = 1000 J c) Q2 = 400 J R25 Q1 = 100 cal Q2 = 70 cal r = 1 - Q2/Q1 r = 1 - 70 cal/100 cal r = 30/100 r = 30% [c] R26 Q1 = 100 J [c] R27 T1 = 400 K T2 = 280 K Q1 = 1200 J r = 1 - 280 K/400 K r = 3/10 r = ŧ/Q1 ŧ = rQ1 ŧ = 360 J Q2 = 840 J [a] R28 T1 = 500 K T2 = 300 K Q1 = 1000 cal r = 2/5 r = ŧ/Q1 ŧ = 2000/5 cal ŧ = 400 cal [d] R29 T2 = 300 K r = 4/10 r = 1 - T2/T1 4/10 = 1 - 300 K/T1 2T1 = 5T1 - 1500 K 3T1 = 1500 K T1 = 500 K 50/100 = 1 - 300 K/T1" T1" = 2T1" - 600 K T1" = 600 K DT1 = 100 K [c]