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A gas in a cylinder expands from a volume of 0.120 m3 to 0.320 m3. Heat flows into the gas just rapidly enough to keep the pressure constant at 1.60 x 105 Pa during the expansion. The total heat added is 1.15 x 105 J. (a) Find the work done by the gas. (b) Find the change in internal energy of the gas.
A gas undergoes two processes. In the first, the volume remains constant at 0.250 m3 and the pressure increases from 2.00 x 105 Pa to 6.00 x 105 Pa. The second process is a compression to a volume of 0.120 m3 at a constant pressure of 5.00 x 105 Pa. (a) In a pV-diagram, show both processes. (b) Find the total work done by the gas during both processes.
Two moles of an ideal gas are heated at constant pressure from T = 27°C to T = 117°C. (a) Draw a pV-diagram for this process. (b) Calculate the work done by the gas.
An ideal gas is enclosed inside a chamber with a volume of 0.1 ft3 at 115 deg. Celsius
and 690 kPa. It then expands isentropically to a final pressure of 138 kPa. Calculate
the mass, final temperature, final volume, change in enthalpy and non-flow work done
during the process for this gas. Assume Cv = 0.7201 kJ/kg.K and Cp = 1.0048 kJ/kg.K
The work required to compress reversibly according to pV1.3= c is 45000 ft.lb if there
is no flow. Determine the change in internal energy and heat transferred if the gas is
air.
1) Classify three kinds of statistics, their need, applicability, the idea of phase space, macro-microstates.
A car tire makes contact with the ground on a rectangular area of 12 cm by 18 cm. If the car’s mass is 925 kg, what pressure does the car exert on the ground as it rests on all four tires?
1 kg of steam at 7 bar, entropy 6.5 kJ/kg K, is heated reversibly at constant pressure until the temperature is 250℃. Calculate the heat supplied.
1 kg of steam at 100 bar and 370℃ expands reversibly in a perfectly thermally insulated cylinder behind a piston until the pressure is 38 bar and the steam is then dry saturated. Calculate the work done
Calculate the position of Fermi level Ef at 200K for germanium crystal containing
10x1022 Boron atom per meter cube.
