Molecular Physics | Thermodynamics Answers

Define order of magnitude of maximum speed, with which artillery projectile fly out of a barrel. What requirements should be followed in order the speed was lead to maximum?

In Carno cycle instead of refrigerator was chosen water with 4°C. As thermal expansion coefficient with such temperature is equal to zero, for Carno cycle to happen the temperature should not be shown on the refrigerator, that is, thermal expansion coefficient is equal to one. Where is the mistake?

Under which polytropic exponent the ideal gas heats and under which is cools?

Show, that near absolute zero surface tension of liquid does not depend on temperature, that is lim(dσ/dT) (T→0). Specifically it refers to helium - the only substance which stays liquid under absolute zero temperature.

Compare weight and volume of two bodies, respectively made of tin and lead, if they contain equal amounts of matter.

A tank with liquid, above which is the air, has a hole in the upper lid, which is tightly closed with a stopper. Why after some time does the liquid stop leaking if you open a valve, located at the bottom of the tank? What should be done to ensure the free flow of fluid?

Specific heat of vaporization of the ether is much lower than the specific heat of vaporization of water. Why then does a soaked with ether arm feels a stronger cooling than when it is wetted with water?

Can it be assumed that under normal atmospheric pressure, the water, located in a fairly deep pot, boils at 100ºC?

If it is quite warm and wet in the room, then when you open the vents in winter fog clubs are formed, which descend in the room, and go up on the street. Please explain the phenomenon.

Why do glasses cover with mist when a person enters the room from the cold?