Question

A closed compartment containing gas is moving with some acceleration in horizontal direction. Neglect effect of gravity. Then, the pressure in the compartment is

• A. same everywhere
• B. lower in front side
• C. lower in rear side
• D. lower in upper side

Answer 1

Answer: (B)

If a fluid (gas or liquid) is accelerated in positive x - direction, then pressure decreases in positive x - direction. Change in pressure has following differential equation.

$\frac{\text{d}p}{\text{d}x}=-pa$
where p is the density of the fluid. Therefore, pressure is lower in front side.