Fine grains of beach sand are assumed to be spheres of radius 38.5 m. These grains are made of silicon dioxide which has a density of 2600 kg/m3 .

Fine grains of beach sand are assumed to bespheres of radius 38.5 µm. These grains aremade of silicon dioxide which has a density of2600 kg/m3.What is the mass of each grain of sand?Answer in units of kgConsider a cube whose sides are 0.824 m long.How many kg of sand would it take for thetotal surface area of all the grains of sand toequal the surface area of the cube?Answer in units of kg