The equation h is equal to 7 sine open paren pi over 21 t close paren plus 28 can be used to model the height, h , in feet of the end of one blade of a windmill turning on an axis above the ground as a function of time, t , in seconds. How long is the blade? Assume that the blade is pointing to the right, parallel to the ground, at t is equal to 0 , and that the windmill turns counterclockwise at a constant rate.
In a sinusoidal height model, the amplitude gives the end of the blade’s maximum vertical distance from the axis. The coefficient of sine is 7, so the blade’s length (the radius of its circular path) is 7 feet. The constant 28 is the height of the axis above the ground, not the blade length.
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