Physics (AS & A Level) · May / June 2018 · Paper 12 · Question 2

The drag coefficient C_d is a number with no units. It is used to compare the drag on different cars at different speeds. C_d is given by the equation C_d = \frac{2F}{v^n \rho 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. A1
2. B2
3. C3
4. D4

As printed in the paper