the principle that resultant of the external forces and kinetic reaction acting forces is zero

basically i dont knw!

The basic principle behind the wind mill is that the wind as an external force changes the static force to a kinetic force(from rest to motion).This kinetic energy rotates the wind mill blades which produces electricity.

Moving air has both mass and speed, therefore it has kinetic energy. In principle, this can be converted into other forms of energy.

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