The blades of a windmill sweep out a circle of area A.
Assume that the windmill converts `25%` of the wind energy into electrical energy and that `A=30 m^2`, v=36 km/h and density of air is `1.2kg//m^3`. What is the 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, what is the mass of the air passing through it in time t?

The blades of a windmill sweep out a circle of area A.If the wind flows at a velocity V perpendicular to the circle, what is the Kinetic energy of the air passing through it in time t?

A windmill generates electrical energy. Suppose, the windmill converts a fixed part of the wind energy linked with the blades, to electrical energy . If the wind velocity is v, the output electric power is directly proportional to

Two parallel plates of area 100 cm^2 are given equal and opposite charges of 10^(-7)C . The space between the plates is filled with a dielectric material, and the electric field within the dielectric is 3.3xx10^5 V. m^(-1) . What is the dielectric constant of the dielectric?

The mass of air striking the blades of a windmill every second is 400 kg . The velocity of the wind is 20 m*s^-1 . What is the rate of storage of energy in the windmill (in kW unit)? How much water can be raised per second , up to a height of 5m, using the windmill? g=10 m*s^(-2) .

Two parallel plates of area 100 cm^2 are given equal and opposite charges of 10^(-7)C . The space between the plates is filled with a dielectric material, and the electric field within the dielectric is 3.3xx10^5 V. m^(-1) . What is the total induced charge density on either face of the dielectric?

When 5V potential difference is applied across a wire of length 0.1 m, the drift speed of electron a 2.5 times 10^-4 m.s^-1 . IF the electron density in the wire is 8 times 10^28 m^-3 , the resistivity of the material is close to