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What is the net thrust of the jet engine if the mass flow rate is 500kg/s, exit velocity is 1000m/s and inlet velocity is 600m/s?

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What is the net thrust of the jet engine if the mass flow rate is 500kg/s, exit velocity is 1000m/s and inlet velocity is 600m/s?

(a) 400kN

(b) 600kN

(c) 500kN

(d) 200kN

The question was asked by my school teacher while I was bunking the class.

The above asked question is from Thrust Producing Power Plant in division Aircraft Force Systems and the Equations of Motion of Aircraft Performance

1 Answer

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Best answer
Right choice is (d) 200kN

Easiest explanation: The answer is 200Kn. Given ṁ=500kg/s, Vj=1000m/s and V=600m/s. Substitute the values in the formula, FN=ṁ(Vj-V).

On substituting FN=500 (1000– 600)

On solving FN=20000N.

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