Molecular Physics | Thermodynamics Answers

 How much heat must be added to a system at 298 K for the number of accessible states to increase by a factor 

When a gas undergoes a change in temperature but no change in volume, work is done on or by the system.

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Cans of tomato sauce are to be cooled in a refrigerator. The cans are cylindrical and 20 cm in length and 15 cm in diameter. The can surface is at 30°C and the air in the refrigerated space is at 10°C. Two alternate stacking are possible-namely vertical stacking and horizontal stacking. Determine the method that will be better. Neglect cooling on the end surfaces

The van der Waals equation of state

(p+a/v²)(v-b) = RT

where a and b are constants. Its critical isotherm has a point of inflection at the criti cal point. (a) Show that these expressions for the constants must obtain: a = 9RTcvc/8 = 3pv², b = vc/3. (b) Compute the ap proximate values of the a and b for the fuel octane CsHis and compare results with values of a and b found in Item B 18.

There are required at least 20 kg of steam at 600 bar, 750°C to conduct an ex periment; a 140-L heavy duty tank is available for storage. Predict if this is adequate storage capacity using (a) the ideal gas theory, (b) the compressibility factor, (c) the van der Waa!'s equation, (d) the Mollier chart, Item B 16 (SI).

Find the values of Cp and ᵞ for a gas whose gas

constant is 0.324 kJ/kg K and Cv = 0 84 kJ/kg K.

If 2.25 kg of this gas with an initial volume of

1.15 m3 undergoes a process during which its

pressure remains constant at 7 bar and its

temperature becomes 280‘C at the end of the

process, calculate: (a) the change in internal

energy, (b) the change in enthalpy, (c) the

transferred heat, and (d) the work done.

A bird is flying with a speed of 16.8 m/s over water when it accidentally drops a 2.50 kg fish.

The acceleration of gravity is 9.81 m/s2 .

If the altitude of the bird is 6.20 m and air resistance is disregarded, what is the speed of the fish when it hits the water?

Answer in units of m/s.

A gas turbine receives 1 lb/sec air at 300 atm, 450°R and expands it reversibly to 30 atm in an adiabatic steady flow manner; ∆P = 0; ∆K = 0. (a) Use the deviation charts and find the exit air temperature and the work. (b) Solve using ideal gas theory and compare with foregoing answers.

A manufacturer of pressurized gas containers desires to obtain a plot of pressure versus volume at selected temperatures. Use one of these three equations of state on the reduced basis, van der Waals, Redlich Kwong, Berthelot, and write the computer program.

A gas turbine receives 1 lb/sec air at 300 atm, 450°R and expands it reversibly to 30 atm in an adiabatic steady flow manner; AP = 0; AK = 0. (a) Use the deviation charts and find the exit air temperature and the work. (b) Solve using ideal gas theory and compare with foregoing answers.