Q. The thrust developed by a rocket-motor is given by $F = mv + A(p_{1} - p_{2})$, where $m$ is the mass of the gas ejected per unit time, $v$ is velocity of the gas, $A$ is area of cross-section of the noszzle, $p_{1} \bullet p_{2}$are the pressures of the exhaust gas and surrounding atmosphere. The formula is dimensionally
A) Correct
B) Wrong
C) Sometimes wrong, sometimes correct
D) Data is not adequate
Explanation
Each of three terms in the given equation has the dimensional formula of force.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.