At a certain location, wind is blowing steadily at 10 m/s. Determine the mechanical energy of air per unit mass and the power generation potential of a wind turbine with 80-m-diameter (D) blades at that location. Take the air density to be 1.25 kg/m3. The mechanical energy of air per unit mass is kJ/kg. The power generation potential of the wind turbine is kW.

Explanation:

v = Velocity of wind = 10 m/s

A = Swept area of blade =

d = Diameter of turbine = 80 m

= Density of air =

Wind energy per unit mass of air is given by

The mechanical energy of air per unit mass is

Power is given by

The power generation potential of the wind turbine is .

that would be because of both gravity and friction. so     c

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.