(Power generation) Wind turbine power is becoming an important electric power generation s...

(Power generation) Wind turbine power is becoming an important electric power generation source. The power generated from a wind turbine is given by this formula:

P is the power (watts).

Cp is the performance coefficient (dimensionless = .25 for most systems).

D is the air density (kg/m3).

S is the blade sweep area (m2).

V is the wind velocity (m/s). 

a. Using this formula, write, compile, and run a C++ program that determines the watts generated by a wind turbine having a blade sweep area of 21 m2, with a wind velocity of 4.47 m/s (10 mi/hr). Although air density depends on both temperature and altitude, assume an air density of 1.23 kg/m3, which is the air density at sea level at 15° C. Your program should produce this display:

The power output is xxxx.xxxx

The xxxx.xxxx denotes placing the calculated value in a field wide enough for four places to the right and four places to the left of the decimal point.

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b. After verifying that your program is working correctly, use it to determine the watts generated by a wind turbine operating at sea level at a temperature of 15° C, having a blade sweep area of 21 m2, with a wind velocity of 8.94 m/s (= 20 mi/hr). Again, use an air density of 1.23 kg/m3 (air density at sea level at 15° C).