PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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5. The 12-Mg "jump jet" is capable of taking off vertically from the deck of a ship. If its jets exert a
constant vertical force of 150 kN on the plane, determine its velocity and how high it goes in t=
6s, starting from rest. Neglect the loss of fuel during the lift.
150 kN
The pilot of a jet transport brings the engines to full takeoff power before releasing the brakes as the aircraft is standing on the runway.
The jet thrust remains constant, and the aircraft has a near-constant acceleration of 0.34g. If the takeoff speed is 190 km/h, calculate
the distance s and time t from rest to takeoff.
Answers:
t =
i
The 333-Mg jet airliner has three engines, each of which produces a nearly constant thrust of 230 kN during the takeoff roll.
Determine the lengths of runway required if the takeoff speed is 213 km/h. Compute s first for an uphill takeoff direction from A to B
and second for a downhill takeoff from B to A on the slightly inclined runway. Neglect air and rolling resistance.
Assume 0 = 0.7°.
0
Answers:
Horizontal
Uphill from A to B:
Downhill from B to A:
S= i
S= i
B
m
3
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