An infinite cylinder of radius R carries a uniform surface charge a. We propose to set it spinning about its axis, at a final angular velocity w f. How much work will this take, per unit length

the average force exerted by the rain on the roof is 1.065 N

Explanation:

Given;

speed of the rainfall, v = 15 m/s

the mass of the rate of the rainfall, m' (m/t) = 0.071 kg

Let the average force exerted by the rain on the roof  = F

The average force exerted by the rain on the roof  is calculated by Newton's second law of motion;

Therefore, the average force exerted by the rain on the roof is 1.065 N