THE MOVEMENT OF AIR : WIND

Assertion : A wave is motion of matter as a whole in a medium. Reason : Wind is same as sound wave in air.

Statement - I: Air, when strong in the form of air currents, is called wind. Statement - II: Wind plays an important role in the dispersal of seeds and fruits.

[A]: Rate of transpiration is high in low wind velocity. [R]: Wind removes humid air from around the leaf due to which transpiration is high.

The blades of a windmill sweep out a circle of area A. (a) If the wind flows at a velocity upsilon perpendicular to the circle, what is the mass of air passing through it in time t? (b) What is K.E. of the air ? (c) Assume that the wind mill converts 25% of the wind's energy into electrical energy , and that A=30m^(2), upsilon=36km//h and the density of air is 1.2kg//m^(3) . What is electrical power produced ?

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

What is wind ? How does it arise ? What is wind energy ?

Effect Of Winds

The blades of a wind mill sweep out a circle of area A. If wind flows with velocity v perpendicular to blades of wind mill and its density is p , then the mechanical power received by wind mill is