Teste 1 Fisica 3c Prof Angela Foerster

The p-V diagram shown in Fig. 21-8 applies to a gas undergoing a cyclic change in a piston-cylinder arrangement. What is the work done by the gas in (a) portion AB of the cycle? (b) portion BC? (c) portion CD? (d) portion DA? For the thermodynamic cycle shown in Fig. 21-8, find (a) net output work of the gas during the cycle, (b) net heat flow into the gas per cycle. A sample containing 1.00 kmol of the nearly ideal gas helium is put through the cycle of operations shown in Fig. 21-3. BC is an isothermal, and pA = 1.00 atm, V4 = 22.4 m³, p2 = 2.00 atm. What are TA, Tb, and Ve? A certain double-pane window consists of two glass sheets, each 80 cm x 80 cm x 0.30 cm, separated by a 0.30-cm stagnant air space. The indoor surface temperature is 20°C, while the outdoor surface temperature is 0°C. How much heat passes through the window each second? k = 2 x 10^-3 cal/s · cm · °C for glass and about 2 x 10^-4 cal/s · cm · °C for air.