Estimate the number of raindrops that fell during the storm

[andrewn]

Homework Statement

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.

Homework Equations

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

The Attempt at a Solution

no idea where to start because the radius and area of a single raindrop is unknown

 

[learningphysics]

Nothing else is given?

 

[andrewn]

nope

 

[Yapper]

Maybe google average volume of a rain drop, can't 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.

 

[rootX]

that's a fermi problem; they give these like problems in the beginning,
so just use approximations,
there's no correct answer