Wednesday
December 17, 2014

Homework Help: Precalculus II

Posted by GAGAN on Tuesday, February 4, 2014 at 1:54pm.

1. The number of hours of daylight D(t) in Halifax at day t can be approximated by the function

D(t) = a sin(bt + c) + d,

where t = 1 on January 1, and t = 365 on December 31. The period is one year, and the cycle starts on the vernal equinox, March 21, which has 12 hours of daylight (note that March 21 is day 80 in the year, since 31 + 28 + 21 = 80), reaches a maximum of about 15.3 hours at the summer solstice, and a minimum of about 8.7 hours at the winter solstice. Sketch the graph for the number of hours of daylight, and find a, b, c, and d to get the function. Then estimate the number of hours of daylight on your birthday.

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