# Calculating force of Air Resistance

1. Dec 31, 2008

I'm having a little trouble calculating the force of air resistance for a bicycle.
The formula I used is: Fd=1/2pv^2ACd .
p= 1.3kg/m^3
v= 13.44 meters/sec.
A= 1.15 meters^2
Cd= 0.9
I got an answer, but I don't know if it is correct, can someone please verify?I got 121.52 Newtons.

2. Dec 31, 2008

### PhanthomJay

The formula is correct, and so is your algebra. The answer is correct for a speed of 13.44m/s PROVIDED that you are using the correct value for Cd and A. Were they given to you?

3. Dec 31, 2008