Consider two flat plate airfoils as lumped "lifting elements" in a tandem arrangement, where the second airfoil is located at so
me distance downstream from the first airfoil. The chords and attack angles of both airfoils are the same. Find the circulations of these airfoils in terms of the free-stream velocity U , attack angle , chord c , and the distance between the airfoils’ leading edges d . Which airfoil generates higher lift force and why? Discuss the effect of the distance between the airfoils on their aerodynamic interaction.
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Answer:
froce by 6 gallon liquid on moon surface is 2.86 lbf
Explanation:
given data:
at earth surface
volume of an incompressible liquid = Ve = 25 gallons
force by liquid = 70 lbf
on moon
volume of liquid = Vm = 6 gallons
gravitational acceleration on moon is am = 5.51 ft/s2
Due to incompressibility , the density remain constant.
mass of liquid on surface of earth
mass = 2.173 pound
froce by 6 gallon liquid on moon surface is
Fm = mass * acceleration
= density* volume * am
= 0.0869 *6* 5.51
= 2.86 lbf
Answer:
The volume percent of graphite is 9.9%
Explanation:
Given;
weight percent of graphite, C = 3.1wt%
density of ferrite, = 7.9 g/cm³
density of graphite, = 2.3 g/cm³
Determine the mass fraction;
Determine the volume fraction;
Therefore, the volume percent of graphite is 9.9%