On Nov 19, 2:27*pm, Mark wrote:
Given a mean sea level designated as A,
if a distance of 1,173 ft is required for a
plane to take off when the temperature is
73 degrees F, and 1,356 ft when the temp.
is 86 degrees F, then what distance is required
when the temp. is 79.5 degrees, and given
a different elevation (B) in which a distance of
1,173 ft. is required for takeoff when the temp.
is 70 degrees F, and 1,356 ft.when the temp.
is 80 degrees, then at 75 degrees, what is
the difference in takeoff distance between
the two respective elevations?

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Mark

Since I didn't get any takers on my quiz,
then I'll go ahead and reveal that it was
sort of a trick question.

See, the elevation works out to give
us a take-off distance of...1,264.5 ft.

But when you do the math on the second
elevation, it also comes out to
1,264.5 ft., so,

There is no difference in distance. I
designed the problem to come out
with equal take-off distances.

So you say, then it's impossible, given
the temperature spread and density
altitudes for the performance
to vary like that.

Answer:

It was 2 different airplanes!

(not relevant to the problem)

---
Mark