Posted by **Sam** on Wednesday, July 14, 2010 at 3:57pm.

Calculate the ratio of the drag force on a passenger jet flying with a speed of 850 km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at three-fifths the speed and half the altitude of the jet. At 10 km the density of air is 0.38 kg/m3 and at 5.0 km it is 0.67 kg/m3. Assume that the airplanes have the same effective cross-sectional area and the same drag coefficient C.

(drag on jet / drag on transport) =

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**bobpursley**, Wednesday, July 14, 2010 at 4:47pm
Surely you have an equation for drag force as a function of density, C, and speed.

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**Sam**, Wednesday, July 14, 2010 at 4:54pm
I have D=.5CpAv^2, do i just ignore C and A?? not quite sure what to do...

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**Sam**, Wednesday, July 14, 2010 at 4:59pm
Okay i figured it out. thanks for your assistance I wasn't looking in the right place

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