The wind speed of strong wind in a certain place is 20m / s, the air density is p = 1.3kg/m3, and the effective wind area of a wind turbine is s = 20m2 After the wind turbine, the wind speed becomes 12m / s, and the efficiency of the wind turbine is 80%, then what is the electric power of the wind turbine

The wind speed of strong wind in a certain place is 20m / s, the air density is p = 1.3kg/m3, and the effective wind area of a wind turbine is s = 20m2 After the wind turbine, the wind speed becomes 12m / s, and the efficiency of the wind turbine is 80%, then what is the electric power of the wind turbine

PT = [(1 / 2) ρ V1 * t * s * V1 ^ 2 - (1 / 2) ρ V2 * t * s * V2 ^ 2] * 80%, that is, after the wind turbine, the kinetic energy reduction of the mass in the panic period per unit time is 80%, where V1 = 20m / s, V2 = 12m / s

The wind turbine transforms part of the kinetic energy of the wind passing through the wind wheel into electric energy. Suppose the diameter of the wind wheel is D, the utilization rate of wind energy is η, and the air density is ρ. When the wind speed is V, the power of the wind turbine is______ ．

The wind energy per unit time is: EK = 12mv2 = 12 × ρ π D24 × vt × V2 = 18 ρ π d2v3tt, the electric energy generated in time is: w = η EK = 18 η ρ π d2v3t, so the electric power is: P = wt = 18 η ρ π d2v3, so the answer is: 18 η ρ π d2v3

The wind turbine transforms part of the kinetic energy of the wind passing through the wind wheel into electric energy. Suppose the diameter of the wind wheel is D, the utilization rate of wind energy is η, and the air density is ρ. When the wind speed is V, the power of the wind turbine is______ ．

The wind energy per unit time is: EK = 12mv2 = 12 × ρ π D24 × vt × V2 = 18 ρ π d2v3tt, the electric energy generated in time is: w = η EK = 18 η ρ π d2v3t, so the electric power is: P = wt = 18 η ρ π d2v3, so the answer is: 18 η ρ π d2v3

Does wind energy come from solar energy?
Yes or no, and give reasons
All the energy of the earth comes from solar energy, which is not necessarily. Neither tidal energy nor nuclear energy comes from solar energy, please remember!

Yes, the radiation of the sun is different in temperature from place to place, which causes temperature difference and wind