Question

Calculate the ratio of the drag force on a jet flying at 1049 km/h at an altitude of 10.0 km to the drag force on a prop-driven transport flying at 560 km/h and at an altitude of 5.00 km. The density of air is 0.380 kg/m3 at 10.0 km and 0.670 kg/m3 at 5.00 km. Assume that the airplanes have the same effective cross-sectional area and drag coefficient C.

Answers

drwls
The drag force in each case is
C*(1/2)*(air density)*V^2

Ratio (jet/prop) = (0.380/0.670)*(1049/560)^2 = 1.99

Note that I did not have to change dimensions to m/s, since I used the same velocity dimensions for both planes.
Heidi
Thank you so much... Huge help
Jatiue
It's very helpful and its explained in simple terms which makes it easier to understand.

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