Homework Help: trig

Posted by Dave on Monday, April 30, 2012 at 4:05am.

At rest, the human heart beats once every second. At the strongest part of the
beat, a person's blood pressure peaks at 120mmHg. At the most relaxed part
of the beat, a person's blood pressure drops to 80mmHg. Supposing that t = 0
corresponds to the peak of the beat, write down a trigonometric function that
captures this behavior.

trig - Steve, Monday, April 30, 2012 at 11:54am
since it's a max at t=0, that indicates a cosine function

The period is 1, so we are looking at cos(2pi*t)

max is 120, min is 80, so amplitude is 20, and oscillates around h=100, and our function is

f(t) = 100 + 20cos(2pi*t)

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