Question

Fine grains of beach sand are assumed to be

spheres of radius 38.9 µm. These grains are
made of silicon dioxide which has a density of
2600 kg/m3
.
What is the mass of each grain of sand?
Answer in units of kg.
...?

Answer 1

Volume=(4/3)∗Π∗(38.9∗10−6)3Volume=0.2465683979∗10−12m3finallymass=2600∗0.2465683979∗10−12=0.641kg