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Q21 (b) The blades of a windmill sweep out a circle of area A. What is the kinetic energy of the air?

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The kinetic energy is given by :

$=\ \frac{1}{2}mv^2$

or $=\ \frac{1}{2}\ \rho Avt\ v^2$

or $=\ \frac{1}{2}\ \rho At\ v^3$

Thus the kinetic energy of wind is J.

Posted by

Devendra Khairwa

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