PHYSICS HELP! Fine grains of beach sand are assumed to be spheres of radium 61.4 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
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The radius of the particle is r = 61.4*10^-6 metres, its volume can be found out.
We get the volume approximately 9.7*10^-13 metres.
The product of density and volume gives mass (m = vd), and hence mass = 2600 * (9.7*10^-13)
mass = 2.522*10^-9 kg.