Question

The thrust developed by a rocket-motor is given by
F = mv + A(P₁ - P₂ ) where m is the mass of the gas ejected
per unit time, v is velocity of the gas, A is area of crosssection
of the nozzle, P₁ and P₂ 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

Answer 1

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