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The position of a particle in cm is given by x = (9) cos 3πt, where...

The position of a particle in cm is given by x = (9) cos 3πt, where t is in seconds.

(a) What is the frequency?
Hz

(b) What is the period?
s

(c) What is the amplitude of the particle's motion?
cm

(d) What is the first time after t = 0 that the particle is at its equilibrium position?
s

In what direction is it moving at that time?

* in the positive direction

* in the negative direction    

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