A drop of water is assumed to be spherical and .1 in. in diameter. Determine depth 1000 drops will fill a hollow cylinder whose base has a radius of .5 in.

Volume of sphere - 4/3 x pi x r^3

Volume of hollow cylinder - pi (R^2 - r^2) h

Volume of water - 1.333 x 3.1416 x 0.05 x 0.05 x 0.05 = 0.00052 x 1000 drops = 0.520 cu. in.

Volume of cylinder - 3.1416 (.5 x .5)

How do I proceed from this point ?