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A typical cloud contains droplets of water with an average radius of .5 * 10^-4m.

how many droplets are needed for a cloud that provides a rainfall of .5 cm.

( the answer must be 1*10^21 droplets)

for this second problem I don't know how to find two equations:

A force F acting on a body of mass

*m*a distance

*r*from some origin has a magnitude of F=(

*A**

*m**exp(

*h**

*r*))/

*r*^4, where

*A*and

*h*are both constants.

Given that the force has dimensions kilogram-meter per seconds squared, what are the dimensions of both

*A*and

*h*.

Please can I have some help or suggestions for those problems?

Thank you very much

brad