Question 1035649
 An object's motion is described by the equation: d=5cos(pi/3(t)) 
 The displacement d, is measured in meters. The time t, is measured in seconds.
 Answer the following questions, showing all work:
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t is in the numerator.
d=5cos(pi*t/3)
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 (a) What is the object's position at t=0?
Sub zero for t.
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 (b) What is the object's maximum displacement from its equilibrium position?
The amplitude, 5 meters.
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 (c) How much time is required for one oscillation?
6 seconds.
P = 2pi/(pi/3) = 6
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 (d) At what time will the object first reach its equilibrium position (hint: d=0)?
d=5cos(pi*t/3) = 0
cos(pi*t/3) = 0 = cos(pi/2)
pi*t/3 = pi/2
t/3 = 1/2
t = 1.5 seconds