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Homework Help: Estimate the number of raindrops that fell during the storm

  1. Aug 31, 2007 #1
    1. The problem statement, all variables and given/known data
    A thunderstorm drops half an inch of rain (approximately .01m) of rain which covers an area of about 70 miles (approximately 10^8 m^2).Estimate the number of raindrops that fell during the storm.

    2. Relevant equations
    Area of a sphere,the raindrop= (4/3)(pi)(r^3)

    3. The attempt at a solution
    no idea where to start because the radius and area of a single raindrop is unknown
  2. jcsd
  3. Aug 31, 2007 #2


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    Nothing else is given?
  4. Aug 31, 2007 #3
  5. Aug 31, 2007 #4
    Maybe google average volume of a rain drop, cant do this problem without more info. Unless they want you to estimate the size of a raindrop, or have a previous problem that tells you.
  6. Aug 31, 2007 #5
    that's a fermi problem; they give these like problems in the beginning,
    so just use approximations,
    there's no correct answer
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