| Topic: |
Science > Physics |
| User: |
"andrew1987" |
| Date: |
12 Mar 2005 07:34:10 AM |
| Object: |
rate yourself as a physicist? |
if so you should be able to help me with a couple of questions very
easily.
first: what is the relationship between the frequency of a wave
traveling in a spring and the mass of that spring? im doing some
experiments but my results arent great.
also, would someone please tell me the effect that a barrier would
would have
in a two source (speakers) sound wave interference pattern? affecting
the number of nodes/anodes which will be present etc.?
if someone with MSN would be willing to help me my email is
andrewdare@hotmail.com
thankyou all.
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| User: "andrew1987" |
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| Title: Re: rate yourself as a physicist? |
12 Mar 2005 09:34:55 PM |
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[/quote]
What experiments are you doing? And for what reason?[/quote]
some experiments with waves in springs..for a high school assignment.
i dont really understand this
"Dispersion. Anelasticity terms in Hook's law for overextension, as
with centrifugal distortion in microwave rotational spectra. "
can someone explain the frequency/mass of spring relationship in a
more simple way please?
and the second question about the effect of barrier in sound wave
interference pattern.. ive looked around alot but havent found any
answers, i only have access to one text book.
help please.
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| User: "Gregory L. Hansen" |
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| Title: Re: rate yourself as a physicist? |
13 Mar 2005 08:14:25 AM |
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In article <4233b4df$3_1@127.0.0.1>,
andrew1987 <andrewdare@hotmail-dot-com.no-spam.invalid> wrote:
[/quote]
What experiments are you doing? And for what reason?[/quote]
some experiments with waves in springs..for a high school assignment.
Like stretching out Slinkys on the floor and wiggling them? There'll be
friction with the floor, I'm not sure off-hand how that would affect it.
You might want to look for the article "Longitudinal Standing Waves in a
Vertically Suspended Slinky" by Young, American Journal of Physics 61, 353
(1993). Looks like it's available through scholar.google.com.
i dont really understand this
"Dispersion. Anelasticity terms in Hook's law for overextension, as
with centrifugal distortion in microwave rotational spectra. "
can someone explain the frequency/mass of spring relationship in a
more simple way please?
I think you're thinking of a simple harmonic oscillator with a natural
frequency of oscillation. The simple harmonic oscillator assumes the
spring is quasistatic-- an acceleration is communicated instantly through
its length and you can ignore any waves propagating along it.
In general, a wave doesn't have a particular frequency. An arbitrary
wave form will propagate with a speed that's probably something like
sqrt(k/l) where k is the spring constant per unit length and l the linear
density. It can be decomposed into frequencies by a Fourier series. If
there's a different speed for different frequencies, that's dispersion.
It will make a waveform get wider. Metal springs should have low
dispersion and be highly Hookian until they're stretched to extremes.
and the second question about the effect of barrier in sound wave
interference pattern.. ive looked around alot but havent found any
answers, i only have access to one text book.
There will be some reflection at a barrier and some transmission through
it. And at a boundary between two springs with differet propagation
speeds. The strength of reflection will depend on the impedence mismatch.
The phase of the reflected wave may be inverted if the impedence of the
barrier or second spring is higher than in the first spring.
--
"Usenet is like a herd of performing elephants with diarrhea -- massive,
difficult to redirect, awe-inspiring, entertaining, and a source of
mind-boggling amounts of excrement when you least expect it. "
-- Gene Spafford, 1992
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| User: "Uncle Al" |
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| Title: Re: rate yourself as a physicist? |
12 Mar 2005 12:07:18 PM |
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andrew1987 wrote:
if so you should be able to help me with a couple of questions very
easily.
first: what is the relationship between the frequency of a wave
traveling in a spring and the mass of that spring? im doing some
experiments but my results arent great.
Dispersion. Anelasticity terms in Hook's law for overextension, as
with centrifugal distortion in microwave rotational spectra.
also, would someone please tell me the effect that a barrier would
would have
in a two source (speakers) sound wave interference pattern? affecting
the number of nodes/anodes which will be present etc.?
Do the trig. Look it up. Crack a textbook or three - libraries are
full of them, at least until Homeland Severity removes another source
of terrorist information.
Usenet's claoca,
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Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
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| User: "Sam Wormley" |
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| Title: Re: rate yourself as a physicist? |
12 Mar 2005 07:39:34 AM |
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andrew1987 wrote:
if so you should be able to help me with a couple of questions very
easily.
first: what is the relationship between the frequency of a wave
traveling in a spring and the mass of that spring? im doing some
experiments but my results arent great.
What experiments are you doing? And for what reason?
.
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| User: "Andy Resnick" |
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| Title: Re: rate yourself as a physicist? |
14 Mar 2005 07:42:17 AM |
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andrew1987 wrote:
if so you should be able to help me with a couple of questions very
easily.
first: what is the relationship between the frequency of a wave
traveling in a spring and the mass of that spring? im doing some
experiments but my results arent great.
This isn't really a well-defined question, and it would help to post
more specifics about your experiments. Consider the following, all of
which are modeled as waves, or groups of waves:
A mass, attached to a spring, oscillating up and down.
A plucked guitar string
Seismic waves- shear, pressure, Rayleigh, and Love waves.
Optics: phase, group velocity
The relationship between the frequency, wavelength, and mass density (or
refractive index for optics) in all of these are different.
also, would someone please tell me the effect that a barrier would
would have
in a two source (speakers) sound wave interference pattern? affecting
the number of nodes/anodes which will be present etc.?
This question is also ill-posed. it's a simple boundary-value problem,
but unless you can specify the boundary (i.e. shape of room, location of
speakers, location and shape of barrier, constitutive relations between
material properties and physical response), you have no chance of
solving the problem.
--
Andrew Resnick, Ph.D.
Department of Physiology and Biophysics
Case Western Reserve University
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