Describe one method to separate the sand from the other substances in the beaker. i have more questions like this that are due tomorrow. dm me if you can me. they are about chemistry and i really really need

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.