Molecular Physics | Thermodynamics Answers

Imagine a giant dry-cleaner's bag full of air at a temperature of -33 ∘C floating like a balloon with a string hanging from it 14 km above the ground.Estimate what its temperature would be if you were able to yank it suddenly back to Earth's surface.

Nitrogen gas is filled in an insulated container. If alpha fraction of moles dissociates without exchange of any energy then the fractional change in its temperature is:

The change of internal energy of an ideal gas is 300 J. What is the total heat added into the gas if it expands for 2.010−3 m3 under 1.01105 Pa

A beaker contains some water at room temperature. A student places a mercury-in-glass thermometer in the water with the bulb of the thermometer just beneath the surface of the water.
The student uses an electric fan to blow air across the open top of the beaker. She notices that the reading on the thermometer begins to decrease.
Question : Explain, in terms of water molecules, why the temperature of the water at the surface begins to decrease.

Sand drops vertically at the rate of 2kg/s unto conveyor belt moving horizontally with a velocity of 0.1m/s.
a) Calculate the extra power needed to keep the belt moving.
b) The rate of change of kinetic energy of the sound.
,c) While is the power twice as rate as the rate of change of kinetic energy.

Air at atmospheric pressure (1.0x10^5Pa) is compressed at constant temperature in a bicycle pump so that its volume is reduced by a factor f of 7.

What is the pressure of the air when compressed?

How much heat energy, in kJ, is required to convert 11.9 kg of titanium at its melting point, 1,668 oC from a solid to a liquid?

The latent heat of fusion for titanium is 390 kJ/kg. Round your answer to the nearest kJ.

One mile of a mono atomic gas is taken from an initial pressure P and volume v to final pressure 2p and volume 2v by isothermal expansion and compression show the path in PV diagram and calculate the work done and energy absorbed by the gas?

The primitive translation vectors of a crystal lattice are given by :
a₁=(√(3)a/2)i + (a/2)j
a₂=-(√(3)a/2)i + (a/2)j
a₃= ck
To calculate the volume of the primitive cell and obtain the primitive translation vectors of the reciprocal lattice.