see the graph at
http://www.wolframalpha.com/input/?i=plot+y%3D29%2F2+-+25%2F2+cos(pi%2F3+t),+y%3D2,y%3D27+for+0%3C%3Dt%3C%3D12
use what you know about shifts, periods, and amplitudes to arrive at it.
Sketch two cycles for the motion above the ground of a point on a hamster wheel. The wheel rotates every 6 seconds. The highest it reaches is 27 cm above the ground. The diameter of the wheel is 25 cm.
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