The idling engines of a landing turbojet produce forward thrust when operating i

Question

The idling engines of a landing turbojet produce forward thrust when operating in a normal manner, but they can produce reverse thrust if the jet is properly deflected. Suppose that while the aircraft rolls down the runway at 150 km/h the idling engine consumes air at 50 kg/s and produces an exhaust velocity of 150 m/s. What is the forward thrust of this engine? What are the magnitude and direction (i.e., forward or reverse) if the exhaust is deflected 90 degree without affecting the mass flow? What are the magnitude and direction of the thrust (forward or reverse) after the plane has come to a stop, with 90 degree exhaust deflection and an airflow of 40 kg/s?

Explanation / Answer

a) forward thrust=50*150=7500 N

b)magnitude=7500 N

reverse

c)magnitude=40*150=6000 N

reverse

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