Physics And Measurement Question 255

Question: 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 nozzle, $ P _{1} $ and $ P _{2} $ are the pressures of the exhaust gas and surrounding atmosphere. The formula dimensionally

Options:

A) Correct

B) Wrong

C) Sometimes wrong, sometimes correct

D) Data is not adequate

Show Answer

Answer:

Correct Answer: A

Solution:

[a] Use principle of homogeneity.



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