A buoy floating in the sea is bobbing in simple harmonic motion with period 3 seconds and amplitude  13in.  Its displacement d from sea level at time t=0  seconds is  0 in, and initially it moves upward. (Note that upward is the positive direction.) Give the equation modeling the displacement d as a function of time t.   I worked this out and got d= 3 sin 2pi/13 t

Classical Dynamics of Particles and Systems
5th Edition
ISBN:9780534408961
Author:Stephen T. Thornton, Jerry B. Marion
Publisher:Stephen T. Thornton, Jerry B. Marion
Chapter3: Oscillations
Section: Chapter Questions
Problem 3.36P
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A buoy floating in the sea is bobbing in simple harmonic motion with period 3 seconds and amplitude  13in.  Its displacement d from sea level at time t=0  seconds is  0 in, and initially it moves upward. (Note that upward is the positive direction.)

Give the equation modeling the displacement d as a function of time t.

 

I worked this out and got

d= 3 sin 2pi/13 t

but that is incorrect. Please help.

.

 

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