Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Air Resistance of a car

  1. Nov 18, 2005 #1
    The Air Resistance of a car grows proportional to the square of the velocity. On a certain car is the air resistance 0,18kN when the velocity is 54km/h.

    So the problem is ..

    What is the air resistance when the velocity is 90 km/h?

    How high is the velocity when the air resistance is 0,30kN?

    I don't understand how to do this please help me...
     
  2. jcsd
  3. Nov 18, 2005 #2

    Astronuc

    User Avatar
    Staff Emeritus
    Science Advisor

    Write an equation which gives the relatioship for Air Resistance and the square of velocity.

    Then solve for the constant since one is given a value for air resistance and the corresponding velocity.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook