Find The Pressure Exerted On The Roof By The Rain

Steady rain giving 5 mm an hour turns suddenly into a downpour 20 mm an hour and the speed of rain drops falling vertically on to a flat roof simultaneously doubles.

Find the pressure exerted on the roof by the rain.

Assuming that the rain comes to rest upon striking the car vf 0m s find the average force exerted by the rain on the roof during a 3 second interval. A find the volume of water on the roof express your answer in centi cubic metre and cubic metre. B find the mass of water that falls on the roof if 1centi cubic metre of water has a mass of 1gram express your answer in kilogram. The pressure exerted by the falling rain on the roof rises by a factor of.

We can find the pressure exerted on the face using a re arranged bernoulli equation. The drops strike the roof with a speed of 15 m s and the mass of rain per second striking the roof is 0 071 kg s. A flat rectangular roof measures 7 5m by 4m 12mm of rain falls on the roof. Drops of rain fall perpendicular to the roof of a parked car during a rainstorm.

Assuming that the rain comes to rest upon striking the car vf 0 m s find the average force exerted by the rain on the roof during a 3 second time interval. Please show the steps on how you got the answer thanks. The mass of the rain per second that strikes the roof is 0 060 kg every second. 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.

Homework equations delta p f delta t the attempt. Homework statement in a tropical rainstorm 40mm of rain fell in one hour. Where f wind is the force acting on the gutter due to the wind ρ is the density of air v is max wind speed l is the exposed gutter edge length and w is the width of the roof.