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# Working with Impulse

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During a violent thunderstorm, hail of diameter 1.0 cm falls directly downward at speed of 25m/s. There are estimated to be 120 hailstones per cubic meter of air. (a) What is the mass of each hailstone (density = 0.92 g/cm^3)? (b) Assuming that the hail does not bounce, find the magnitude of the average force on a flat roof measuring 10m x 20m due to the impact of the hail.

https://brainmass.com/physics/work/impulse-force-184650

#### Solution Preview

Hint: during impact the force on a hailstone from the roof is approximately equal to the net force on the hailstone because the gravitational force on it is small.

Mass/ Volume = Density

Hence ...

#### Solution Summary

The solution finds the magnitude of the average force.

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