Explanation Given: Mass of the plane ( M p ) is 6.5 Mg . The horizontal touchdown velocity of plane ( V ) is 60 m / s . The velocity of exhaust relative to the plane ( V e ) is 900 m / s . Steady mass flow of air ( m ˙ a ) is 24 kg / s . Calculations: Consider the fixed control volume consists of entire plane, jet engines, deflector and the fluid contained in it. Assume the mass flow rate of fuel is negligible when compared with mass flowrate of air. m ˙ f < < m ˙ a Then, m ˙ a + m ˙ f ≃ m ˙ a Determine the horizontal component of velocity of exhaust relative to plane. V e = ( 900 m / s ) cos 30 ° Write the equilibrium force equation in horizontal direction for the plane motion. ∑ F x = M p d V d t + m a V + ( m a + m f ) V e 0 = (

2nd Edition

ISBN: 9780134649290

Author: Russell C. Hibbeler

Publisher: PEARSON

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Chapter 6, Problem 77P

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The velocity of the plane 4 s after it lands.

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Chapter 6, Problem 76P

Chapter 6, Problem 78P

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