
The
Lift Equation Answers
 Identify each letter
in the lift equation and list acceptable units for each quantity.
L = lift,
newtons
Cl = lift
coefficient, none
rho = density,
kg/m^{3}
V = velocity,
m/s
A = area,
m^{2}
 Use
Wikipedia
(http://en.wikipedia.org/wiki/Boeing_747), or a search engine, and look up
the Boeing 747. What is its wing area? 511.0
m^{2} (the following numbers may vary slightly due to model number)
 If the Boeing 747
above is cruising at 940 km/h, the density of the air is 1.20 g/L, and
the lift coefficient is 1, what is the lift ? 20
900 000 newtons
 Use
Wikipedia
(http://en.wikipedia.org/wiki/Boeing_777), or a search engine, to find the
Boeing 777. What is its wing area? 377.7
m^{2}
 If the Boeing 777
is cruising at the same velocity under the same conditions as the 747
above, what is its lift? 15 400 000 newtons
 Look up the DC8
on Wikipedia
(http://en.wikipedia.org/wiki/DC8), or use a search engine.
What is its
wing area? 267.9 m^{2}
 What is the DC8's
cruising velocity? 270 km/h
 If the air density
is 1.26 g/L and the lift coefficient is 1.5, what is the lift of the
DC8? 1 320 000 newtons
 Find the F/A18A
Hornet
on Wikipedia
(http://en.wikipedia.org/wiki/F18), or use a search engine.
What is its
wing area? 37.2 m^{2}
 What is the F/A18A's
lift while it flies at 700 mph, the air density is 1.31 g/L, and the
lift coefficient is 1.8? 4 610 000 newtons
