What is resonance?

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Offline erickejah

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What is resonance?
« on: 17/06/2009 17:35:40 »
What do you think that mechanical resonance is?  Do you think of a good example to share with us?

Does our body produce any form of mechanical resonance?

Is mechanical resonance used to start radioactivity?
« Last Edit: 17/06/2009 19:54:46 by chris »

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Offline RD

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Re: What is resonance?
« Reply #1 on: 17/06/2009 19:01:06 »
a good example [of mechanical resonance] to share with us?

The mirror on a motorbike I had would noticeably vibrate (blurring the image) when the engine was at a particular rpm,
 when the engine revs were above or below that level the mirror was static.
« Last Edit: 17/06/2009 19:04:45 by RD »

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Offline syhprum

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What is resonance?
« Reply #2 on: 18/06/2009 18:52:42 »
Our perception of sounds depends on a resonant structure in the inner ear the cochlea, this is a spiral structure with a series of hair like resonators that acts in a similar way to a spectrum analyser sending a frequency analysis of the sound waves to the brain.
syhprum

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Offline Soul Surfer

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What is resonance?
« Reply #3 on: 18/06/2009 23:59:22 »
Resonance can occur in any process where there is a reversible process for transferring energy between two energy stores.  In mechanical processes this is usually between potential energy and kinetic IE the height and the velocity of a swing or pendulum or the tension and speed of a spring or tuning fork.  in electromagnetics it is usually between charge stored in a capacitor and magnetic field stored in an inductor.

to get a good resonance the amount of energy lost per cycle of motion must be minimised  this property is called the Q factor and the larger it is the less energy is lost each cycle.
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Offline erickejah

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What is resonance?
« Reply #4 on: 19/06/2009 21:08:35 »
Thanks :), I am still wondering if radioactivity is (can be) started by resonance of molecules...
« Last Edit: 20/06/2009 02:23:13 by erickejah »

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Offline Madidus_Scientia

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What is resonance?
« Reply #5 on: 20/06/2009 06:30:30 »
When you push someone on a swing, you are providing a resonating force, you wait until they are back near you before you push again. If you pushed them twice as frequently they wouldn't swing as far.