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Old 14th June 2007, 08:30 PM   #31
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Quote:
Originally posted by y8s


nah a pendulum of a given length will always swing at the same frequency, regardless of amplitude.

unless of course the amplitude is zero.

high school physics.
I don't remember mentioning amplitude? I referred to altering the frequency of a pendulum.
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Old 15th June 2007, 11:48 PM   #32
Svante is offline Svante  Sweden
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Quote:
Originally posted by darkfenriz
approx. 1003 hPa
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Old 15th June 2007, 11:58 PM   #33
Svante is offline Svante  Sweden
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Actually 0 Hz can be interpreted in many different ways.

One would be like the professor next door to me says: "frequency is the same as 'often-ness'". From that definition, 0 Hz would mean that the event that we study has never happened. Like: At what frequency has God created earths (ok, bad example for religous people ).

Another one would be Fourier analysis. A signal only containing 0 Hz would be a signal that has been and will be forever "on" at a fixed value. Even before big bang, it was on. This is of course not possible.

Yet another way would be to make Fourier analysis of a snippet of a signal (this is the way we usually do it). By doing so we limit the frequency resolution and each frequency bin will have a non-zero width. In this case, the DC of the signal comes out in the 0 Hz bin.
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Old 16th June 2007, 12:14 AM   #34
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Quote:
Originally posted by Sonusthree
I don't remember mentioning amplitude? I referred to altering the frequency of a pendulum.
If I remember correctly, and I think it's what y8s is referring to, is that as a pendulum reduces it's amplitude, the frequency does not change. In order to change the frequency, you must change the length of the pendulum.

Did I get that right?
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Old 16th June 2007, 12:39 AM   #35
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Quote:
Originally posted by Cal Weldon

In order to change the frequency, you must change the length of the pendulum.

Did I get that right?

Yes.
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Old 16th June 2007, 01:38 AM   #36
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The fan works for me. Unidirectional flow = DC = No Hertz at all.

With laminar air flow, if you want to get into it deeper.

Thus, by extrapolation we have those woofers that actually use a fan.

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Old 16th June 2007, 03:59 AM   #37
Hartono is offline Hartono  Indonesia
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Hi Bear,

"Thus, by extrapolation we have those woofers that actually use a fan."

you mean THAT woofer ?


I'll go with aircon, much cooler and cheaper.


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