The density of air under normal conditions is about 1.2 kg/m3. For a wind speed of 10 m/s, find (a) the actual power carried in the wind
(b) the maximum power (Betz limit) extractable by a wind turbine with a blade area of 10 m2; and
(c) the actual power extracted by a wind turbine with a blade area of 10 m2 and a power coefficient of 0.46.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

i guess it’s a and b