Question

drops of rai fall perpendicular to te roof of a parked car during rainstorm. The drops strike the rook with a speed of 15 m/s and the mass of rain per second striking the roof is 0.071 kg/s

a. Assuming the drops come to rest after striking the roof, find the average force exerted by the rain on the roof.

b. If hailstones having the same ass as the rian drops fall on the roof at the same rate with the same speed, how would the average force on the roof compare to that found in part a? Assume the hail stones bounce back up off the roof.

Answer 1

F = Delta p/Delta t = m Delta v/delta t F = 0.071 times 15 = 1.065 N if they back normal force will be fighter then rain