Forced Mass on Spring please help

[hattonphilip]

1. The problem statement, all variables and given/known data

A mass of 2kg is hung on a spring of spring constant 3.92 x 103 Nm-1. The natural frequency for the system is wo = 44.3 s-1. The system is forced to vibrate by an alternating force of amplitude
F = 2 cos (wt) Newtons.
What is the amplitude of vibration when w = 20 s-1



2. Relevant equations



3. The attempt at a solution

[radou]

You should find this link useful in order to gather up some relevant equations and show an attempt to solve the problem: http://ltcconline.net/greenl/courses/204/appsHigherOrder/forcedVibrations.htm

[hattonphilip]

thankyou very much, i have been searching for ages to find a page as useful as that

[OlderDan]

thankyou very much, i have been searching for ages to find a page as useful as that

This one looks pretty good too

http://www.scar.utoronto.ca/%7Epat/fun/NEWT1D/PDF/OSCDAMP.PDF