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March 29, 2015

Homework Help: Forced Oscillation - drwls => I need your help =)

Posted by ~christina~ on Friday, February 22, 2008 at 2:27am.

A 2.00kg object attatched to a spring moves without friction and is driven by an external force given by

F= (3.00N)sin(2pi*t)

The force constant of the spring is 20N/m. Determine
a) period
b) amplitude of motion

a)T= 2pi/omega
T= 2pi/ 2pi= 1s

b)A= (Fo/m)/ sqrt(omega^2- omegao^2)^2 + (b*omega /m)^2

I think that..
omega= omegao
b= 0

so then

A= Fo/ m = 3.00N/2.00kg = 1.5 ???

My book states that a) is 1s but b) is 5.09cm which I can't seem to get.

Thanks
C

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