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#1 2005-03-07 20:55:12

Su165
Member
Registered: 2005-03-07
Posts: 1

Help ASAP

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.

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#2 2005-03-07 21:35:36

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,529

Re: Help ASAP

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


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#3 2005-03-17 08:04:56

Roraborealis
Member
Registered: 2005-03-17
Posts: 1,594

Re: Help ASAP

Um...what kind of algebra is that?


School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

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#4 2005-03-17 08:17:36

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,529

Re: Help ASAP

The difficult kind ! It has calculus in it.


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#5 2005-03-17 08:51:11

Roraborealis
Member
Registered: 2005-03-17
Posts: 1,594

Re: Help ASAP

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


School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

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#6 2005-03-17 09:19:23

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,529

Re: Help ASAP

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.


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#7 2005-03-17 09:24:07

Roraborealis
Member
Registered: 2005-03-17
Posts: 1,594

Re: Help ASAP

I'm only thirteen!


School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

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#8 2005-03-17 09:47:45

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,529

Re: Help ASAP

You're doing well!


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#9 2005-03-18 05:30:54

Roraborealis
Member
Registered: 2005-03-17
Posts: 1,594

Re: Help ASAP

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


School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

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#10 2005-03-18 08:52:27

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,529

Re: Help ASAP

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


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#11 2005-03-19 07:35:19

Roraborealis
Member
Registered: 2005-03-17
Posts: 1,594

Re: Help ASAP

You're such a nice person!


School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

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