Help ASAP

Su165 · 2005-03-07 20:55:12

Can anyone give me a hand with this, cause I'm stumped and can't remember exactly how to go about solving this.

here's the eqn

m[d^2x/dt^2 + wsubo^2 x] = F cos wt

I'm supposed to show that x(t) = xsubo cos wt

w is the incident freq
wsubo is the resonant freq
m is mass

I'm guessing it has to be shown by undetermined coefficients but I can't find the right path exactly.

MathsIsFun · 2005-03-07 21:35:36

A bit outside my area, but I found a website that has ALL sorts of stuff about harmonic motion which could help here

Roraborealis · 2005-03-17 08:04:56

Um...what kind of algebra is that?

MathsIsFun · 2005-03-17 08:17:36

The difficult kind ! It has calculus in it.

Roraborealis · 2005-03-17 08:51:11

How old are you expected to be to be at that standard?

MathsIsFun · 2005-03-17 09:19:23

Depends on where you live. Some countries start Calculus in the final year of high school.

But usually Universities teach it in the first year.

I was thinking of putting a small introduction to it on this website.

Roraborealis · 2005-03-17 09:24:07

I'm only thirteen!

MathsIsFun · 2005-03-17 09:47:45

You're doing well!

Roraborealis · 2005-03-18 05:30:54

Thank you.....but how do you know....?

MathsIsFun · 2005-03-18 08:52:27

You noticed, and were curious about, the algebra. You write well, too.

Roraborealis · 2005-03-19 07:35:19

You're such a nice person!

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