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Here
|dw:1352046269529:dw|

so whats the question, that is correct \(a=\ddot x\)
where differentiation is w.r.t time.

oops sorry forgot to post the question

Determine the operating speed of the fan.

|dw:1352046585292:dw|
Am I right?

if u take x as sinusoidal, then x_max = A=0.2mm
are you suppose to take it as sinusoidal ?

i am nt sure.
Bt in the answr given
they use
\(x=Acos(\omega t)\)
i dnt get why they use it.

and this speed you will get it in rad/sec
ofcourse by taking sqrt of w^2

right ?

ya

where do we use
\(x=Asin\omega t\) and \(x=Acos\omega t\)?
Are they equal? I am nt getting this.

so what equation should be used here @hartnn?

Ha k. Thanxxxxx a lot for helping me:)

welcome ^_^