A Hailstorm Causes an Average Pressure of 1 $\times$ 10^-3 Kg,have an Average Velocity of 10 M/s Perpendicular to the 200-M²

question 1

Multiple Choice

A hailstorm causes an average pressure of 1.4 N/m² on the 200-m² flat roof of a house.The hailstones,each of mass 7.0 $\times$ 10^-3 kg,have an average velocity of 10 m/s perpendicular to the roof and rebound after hitting the roof with the same speed.How many hailstones hit the roof each second?

• A)4000
• B)2000
• C)1000
• D)10
• E)800

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Definitions:

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