The blades of a windmill sweep out a circle of area:- If the wind flows at a velocity v perpendicular to the circle, what is the mass of the air passing through it in time t ?

The blades of a windmill sweep out a circle of area :-What is the kinetic energy of the air ?

Prove that the perpendicular at the point of contact to the tangent to a circle passes through the centre.

The blades of a windmill sweep out a circle of area :- Assume that the windmill converts 25% of the wind’s energy into electrical energy, and that A = 30 m^2, v = 36 km//h and the density of air is 1.2 kg ,m^-3 . What is the electrical power produced ?

A circle has radius 3u n i t s and its centre lies on the line y=x-1. Find the equation of the circle, if it passes through (7,3)dot

Force on a charge in electric and magnetic fields A charge particle follows a parabolic path in a uniform electric field and a charged particel moving in a uniform magnetic field has two kinds of motions lnear motion in the direction of magnetic field and circular motion in a plane perpendicular to the magnetic field. when charge q is moving perpendicular to the magnetic field B, the radius of the circular path is r=(mv)/(Bq) . If v and B makes an angle theta , then r=(mvsintheta)/(Bq) , and the time period T=(2pim)/(Bq) . Under the influenece of a uniform magnetic field, a charged particles is moving in a circle of radius r with speed v. The time period of motion.

Force on a charge in electric and magnetic fields A charge particle follows a parabolic path in a uniform electric field and a charged particel moving in a uniform magnetic field has two kinds of motions lnear motion in the direction of magnetic field and circular motion in a plane perpendicular to the magnetic field. when charge q is moving perpendicular to the magnetic field B, the radius of the circular path is r=(mv)/(Bq) . If v and B makes an angle theta , then r=(mvsintheta)/(Bq) , and the time period T=(2pim)/(Bq) . When a charged particle q is moving with velocity vecv in a magnetic field vecB , the force is non-zero. It means.