Question

A cubic vessel (with faces horizontal + vertical) contains an ideal gas at NTP. The vessel is being carried by a rocket which is moving at a speed of 500 m/s in vertical direction. The pressure of the gas inside the vessel as observed by us on the ground

• A. Remains the same because 500 m/s is very much smaller than nrms of the gas
• B. Remains the same because motion of the vessel as a whole does not affect the relative motion of the gas molecules and the walls
• C. Will increase by a factor equal to [v2rms + (500)2]/v2rms, where vrms was the original mean square velocity of the gas
• D. Will be different on the top wall and bottom wall of the vessel

Answer 1

Answer: (D)

Will be different on the top wall and bottom wall of the vessel

Answer 2

As $P = \frac{nRT}{V},$ it (i.e., P) remains unaffected as n,R. T and V.