Question

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Answer 1

given ,

density of air = p kg/m3,. velocity of wind = v m/sec, time = t sec,. mass of air = density ×volume, here volume = area (in which air passes)× air velocity× time , Mass of air = density× area× velocity × time, putting the value in formula, mass of air = pAVt ans means option A is correct

Answer 2

Answer:

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Explanation:

The blades of windmill sweep out a circle of area A . and wind flows at a velocity v perpendicular to circle .

Hence, volume of air passing through the windmill per second = Av

So, volume of air passing through in time t = Av × t

Then, mass = density × volume

                   = ρ × Av × t

mass of air = ρAvt

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