The drag coefficient ${C_d}$ is a number with no units. It is used to compare the drag on different cars at different speeds. It is given by the equation
${C_d} = \frac{{2F}}{{\rho {v^n}A}}$
where F is the drag force on the car, ρ is the density of the air, A is the cross-sectional area of the car and v is the speed of the car.
What is the value of n?
1 )
1
2
3 )
3
4 )
4
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