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Q.
The internal energy of a gas contained in a movable box moving with a constant speed $v$
Thermodynamics
Solution:
The internal energy of a gas contained in a movable box, depends only on the molecular energies, i.e. it is the sum of the kinetic energies and potential energies of the molecules of gas.
The kinetic energy of the moving box is not included in the internal energy.
Thus, internal energy does not depend on the speed $v$ of the box.
