Molecular Physics | Thermodynamics Answers

A certain mass of a gas at standard temperature and pressure (STP) is expanded to 3 times its
o rigin a l v o lu m e un d e r ad iab a tic co n d itio n s. C a lc u la te th e re su ltin g te m p e ra tu re a n d pressure. (Take y = 1.4).

What is Joule-Thomson effect ? Obtain the expression for the Joule-Thomson coefficient for a real gas.

What is phase space ? In a system containing N particles, each particle has three translational and two rotational degrees of freedom. Calculate the dimensions of the phase space.

A reversible engine converts one-sixth of the heat input into work. If the temperature of the sink is reduced to 335 K, its efficiency is doubled. Calculate the temperatures of the source and the sink.

What are intensive and extensive thermodynamic variables ? Show by giving examples that (i) the ratio of two extensive variables is intensive, and (ii) the specific value corresponding to an extensive variable is an intensive property.

Heat supplied to raise steam in the boiler is 3000 KJ/kg while heat rejected by the system to
the cooling water in the condenser is 2000 KJ/kg. The turbine develops power of 1500 KW and
the work required to pump the condensate back into the boiler is 50 KW. Find the steam mass
flow rate.

under a pressure of 14nm-2, some air has a volume of 1.5m3. determine its volume when its pressure is 10nm-2. assuming the temperature is kept constant

how much heat is given out when 50g of steam at 1000c cool to water at 280c? (specific latent heat of vaporization of water =2.3x106jkg-1)

Some hydrogen gas has a volume of 200cm3 at 150c. If the pressure remain constant at what temperature will its volume be 150cm3?

Find the Reynolds number if a fluid of viscosity 0.4 Ns/m2 and relative density of 900 kg/m3
through a 20 mm pipe with a velocity of 2.5 m/s. Is the flow Laminar or Turbulent?
Note: If Reynolds < 2000 the flow is laminar
If Reynolds > 4000 the flow is turbulent
If 2000 < Re < 4000 it is transitional flow
Re =