Subject: What's the formula for calculation body's own frequency?

As you know every body has his own frequency at which it vibrates. Is it 
possible to calculate that frequency or is it possible to find that out 
only with measurements?

I'll give you an example:
Somewhere in USA, a bridge collapsed, because wind made it vibrate at its own
frequency; or when a singer breaks a glass just by singing at the apropriate
tone.
Is it possible to calculate that frequency or is it just possible to measure
it? If it's possible to calculate it, I would like to know the equation for the
calculation of that
frequency.

                                        Sincerly, Miha Zadnik

Response:

Re: What's the formula for calculation body's own frequency?
As you know every body has his own frequency at which it vibrates. Is it 
possible to calculate that frequency or is it possible to find that out 
only with measurements?


_______________________________________________________________
Greetings - Your question was not submitted to the
MAD Scientist Network for the following reason:

Please provide further specifics. As it stands it would be
difficult for us to find an answer to your question. Questions may
be resubmitted via http://www.madsci.org/submit.html

1) What do you mean by 

Re: What's the formula for calculation body's own frequency?