Questions
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 power developed by air is
detailed solution
Correct option is C
m = Mass flow rate of air through the blades = ρ(Av). It is assumed that air comes to rest after passing through blades. The rate at which air is losing kinetic energy = Power developed =Talk to our academic expert!
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The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be then the power of heart in watt is:
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