Molecular Physics | Thermodynamics Answers

An apartment has the dimensions 17 m by 9 m by 6 m. The temperature is 20°C, and the relative humidity is 50 percent. What is the total mass (in kg) of water vapor in the air in the apartment?

An aluminum wing on a passenger jet is
40 m
long when its temperature is
19°C.
At what temperature would the wing be 6 cm (0.06 m) shorter?

A machinist wishes to insert an iron rod with a diameter of 2 mm into a hole with a diameter of 1.995 mm. By how much would the machinist have to lower the temperature (in °C) of the rod to make it fit the hole?

As a gasoline engine is running, an amount of gasoline containing 15,500 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,100 J of work.
(a)
What is the engine's efficiency (in percent)?

(b)
The burning gasoline has a temperature of about 4,400°F (2,700 K). The waste heat from the engine flows into air at about 82°F (301 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures?

34. A horizontal cylindrical tube is divided into four parts with the help of
two fixed partitions A and B and a movable piston C. The tube and the
piston C are made from heat insulating materials whereas the fixed
partitions A and B are made from a conducting material. Volume
itial volume between
the fixed partition B and piston C is V2. These volumes are filled with
an ideal mono-atomic gas at pressure po and temperature To. Outside
the piston C, pressure is also po. Quantity AQ of heat is slowly
transferred through the partition A to the gas trapped between the
partitions A and B. Find temperatures of the gases on both sides of thebetween the fixed partitions A and B is Vi arpartition B and heat transferred through it.

An engine using 1 mol of an ideal gas ini- tially at 21.7 L and 326 K performs a cycle consisting of four steps:
1) an isothermal expansion at 326 K from 21.7 L to 42.1 L;
2) cooling at constant volume to 186 K ;
3) an isothermal compression to its original volume of 21.7 L; and
4) heating at constant volume to its original
temperature of 326 K .
Find its efficiency. Assume that the
heat capacity is 21 J/K and the univer- sal gas constant is 0.08206 L · atm/mol/K = 8.314 J/mol/K.
Answer in units of %.

A thermos bottle containing 250g of Coffee at 90°C is added with a 20g of milk at 5°C. After thorough mixing, what is the final temperature. Capacity for water, coffee and milk is 1.00Cal/g°C

The nitrogen at standard temperature and pressure is 1.251kgm^-3. Calculate the root mean square of nitrogen molecules.

A fluid undergoes a reversible adiabatic compression from 0.5 MPa, 0.2m^3 to 0.05m^3 according to the law PV^1.3=constant. Determine the change in enthalpy, internal energy and heat transfer and work transfer during the process.

The critical temperature Tc for Bose Einstein condensation varies with the number of density of particle as
1)n^(1/3)
2)n^(2/3)
3)n
4)n^(4/3)