(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

So for my intro engineering class one homework problem is given as follows.

"Considering only aerodynamic drag force, calculate the maximum speed (in mph), that a vehicle would experience with the following specifications."

Horsepower = 330

Mass density of fluid = .077 lbm/ft^3 (ρ)

Reference area = 22 ft^2 (Ap)

Drag coefficient = .29 (Cd)

1 horsepower = 550 ft * lbf / s

2. Relevant equations

Fd = .5*(Cd)*(Ap)*ρ*V^2

3. The attempt at a solution

The answer is supposed to be given in mph, and the correct answer is 186mph. What i've tried doing is multiplying both sides of the equation by V, therefore making Fd into power, then using the horsepower value and solving for V, but the answer I get is around 60 mph, 1/3rd the value of the correct answer.

Thanks for the help!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Drag force and maximum velocity

**Physics Forums | Science Articles, Homework Help, Discussion**