(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In a tropical rainstorm, 40mm of rain fell in one hour. Assuming that the raindrops struck an adequately drained roof normally with an average speed of 10m/s, find the pressure exerted on the roof by the rain.

2. Relevant equations

(delta)p = F(delta)t

3. The attempt at a solution

(delta)p = 10 x mass of rainfall striking the roof = F(roof on raindrop) x (delta)t

F(roof on raindrop) = F(raindrop on roof)

Pressure = F(raindrop on roof) / Area of the roof

I have difficulty deriving the expression for mass of raindrop striking the roof. I also do not understand how is "44mm of rain" relevant to the question.

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# Homework Help: Question on impulse

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