Physics
posted by Steeve .
During a violent thunderstorm, hail the size of marbles (diameter = 2.10 cm) falls at a speed of 37.0 m/s. There are estimated to be 175.0 hailstones per cubic meter of air. Assume that, as for ice, 1.00 cm³ of hail has a mass of 0.920 g. What is the mass of each hailstone ?

m₀=ρV=ρ•πD³/6
ρ =920 kg/m³, D=0.021 m
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