The blades of a windmill sweep out a circle of area A. If the wind flows at a velocity v perpendicular to the circle, then the mass of the air of density `rho` passing through it in time t is

Options

A. `Avrhot`
B. `2Avrhot`
C. `Av^2rhot`
D. `1/2Avrhot`

Answer

A

Explanation

Volume of wind flowing per second = Av
Mass of wind flowing per second = `Avrho`
Mass of air passing in time t s = `Avrhot`