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 Drag

  1. Apr 30, 2010 #1
    Calculate velocity of the skydiver of mass M= 80kg as a function of time. The air drag coefficient D= 100g/m = 0.1kg/m. Assume that the skydiver has v=o at t=0.


    In my book high speed air drag is f=Dv^2.
    I found Vt= 88.5 m/s with Sqrt(mg/D). BUT this is not the V they are asking for :(

    my book derives the formula for V with the low speed air drag, not the HIGH speed one. I can't follow the steps they did and figure out what exactly the formula actually is! What I started out with is:

    m*(dv/dt) = mg- Dv^2

    I have no clue where to go from here :( If anyone could help me I appreciate any help I can get!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 30, 2010 #2
  4. Apr 30, 2010 #3
    Thank you so much!
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook