An airplane requires a longer ground roll to lift-off on hot summer da – McqOptions

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1.	An airplane requires a longer ground roll to lift-off on hot summer days because
A.	the thrust is directly proportional to free-stream density.
B.	the thrust is directly proportional to weight of the aircraft.
C.	the lift-off distance is directly proportional to free-stream density.
D.	the runway friction is high on hot summer days.
Answer» B. the thrust is directly proportional to weight of the aircraft.

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