Piston displacement

[Flimjabs]

"The displacement, measured in millimeters, of a piston moving with simple harmonic motion is calculated from
Displacement=25cos(200t +1.3)
Determine the
Amplitude
Periodic time
The frequency
The phase angle, in degrees when compared with 25cos(200t)
The position of the piston when t=0
Hi guys and gals looking for some help on this question and not just the answer but how the answer is achieved
Any help would be greatly appreciated

 

[Steven G]

What have you tried? Where are you stuck? Please post your work so that we can give you a hint.

You can't determine where the piston is when t=0? I don't think that is true but if it is you are over your head in this course.

y=Acos(Bt+C).
What does A, B and C represent?

 

[yoscar04]

If you didn't understand Jomo's guidance, you should review your trigonometry before trying to solve your problem. In particular, check how to draw trigonometric functions.