posted by COFFEE on .
Calculate the ratio of the drag force on a passenger jet flying with a speed of 750 km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at one-fifth 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.
Please help :)
* Physics/Math - bobpursley, Saturday, February 10, 2007 at 7:13pm
You must have been given some equations for drag force, these equations vary, but typically they depend on Area, a coefficeint, and velocity^2.
Post your equations and work, and I will critique.
* Physics/Math - COFFEE, Saturday, February 10, 2007 at 9:54pm
Sorry, the equation given is:
I do not understand what area I am trying to calculate and what the constant equals. How do I find Dp and Area???
You don't need area. Dp is density.
You are calcualting the ratio of drag for th jet as compared to the prop plane.
Notice all the units divide out. The donstant is notshowing, but it divides out anyway.