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Aerodynamics of a ball

  1. Feb 15, 2005 #1
    Hi! I've written a simple software to calculate projectile trajectories when air resistane can't be neglected. I'm planning to test the software with a light ball and a cannon.

    My model simply say
    F = -k * A * v^2
    The force of drag F is proportional to the velocity v squared. k and A are constant of drag and frontal area respectively.

    Can anyone tell me what the constant k would be for a sphere?

    The ball I'm planning to use is about 2.5 cm in diameter, weighs about 5 g (guess) and is pretty smooth. It will be launched at speeds of about 5 - 7 m/s.

    If the information is insufficient, please ask.

    Edit: Please use SI units, thanks!

  2. jcsd
  3. Feb 15, 2005 #2
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