| Topic: |
Science > Physics |
| User: |
"John Doe" |
| Date: |
10 Apr 2006 10:17:31 PM |
| Object: |
simple harmonic motion |
I don't recall the formula for simple harmonic motion
let's say we have a ball that oscillates and moves a total distance of 5 m
from its low point to high point (so amplitude is 2.5?). it takes 7 seconds
to reach its low point (so period is 7?). If at t = 0 ball is at its low
point what is the formula?
is it y = -2.5 cos (something)
-2.5 because at time t = 0 it's at its low point but what is that something
in parentheses? I don't remember the formula. Also, can we express it in
terms of sin??
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| User: "Old Man" |
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| Title: Re: simple harmonic motion |
11 Apr 2006 03:14:00 PM |
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"John Doe" <johndoe@nothing.edu> wrote in message
news:fdF_f.1323$An2.1310@newsread2.news.pas.earthlink.net...
I don't recall the formula for simple harmonic motion
let's say we have a ball that oscillates and moves a total distance of 5 m
from its low point to high point (so amplitude is 2.5?). it takes 7
seconds to reach its low point (so period is 7?). If at t = 0 ball is at
its low point what is the formula?
is it y = -2.5 cos (something)
-2.5 because at time t = 0 it's at its low point but what is that
something in parentheses? I don't remember the formula.
something = 2 * pi * t / Tau
Where Tau = the period = 2 * 7 seconds
[Old Man]
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| User: "John C. Polasek" |
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| Title: Re: simple harmonic motion |
12 Apr 2006 10:29:41 AM |
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On Tue, 11 Apr 2006 15:14:00 -0500, "Old Man" <nomail@nomail.net>
wrote:
"John Doe" <johndoe@nothing.edu> wrote in message
news:fdF_f.1323$An2.1310@newsread2.news.pas.earthlink.net...
I don't recall the formula for simple harmonic motion
let's say we have a ball that oscillates and moves a total distance of 5 m
from its low point to high point (so amplitude is 2.5?). it takes 7
seconds to reach its low point (so period is 7?). If at t = 0 ball is at
its low point what is the formula?
is it y = -2.5 cos (something)
-2.5 because at time t = 0 it's at its low point but what is that
something in parentheses? I don't remember the formula.
something = 2 * pi * t / Tau
Where Tau = the period = 2 * 7 seconds
[Old Man]
y = 2.5*sin(2pi*t/Tau - pi/4)
if "7 sec to reach low point" from where? the high point or from the
median, 0?
John Polasek
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| User: "John Doe" |
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| Title: Re: simple harmonic motion |
11 Apr 2006 12:07:44 AM |
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I solved this problem. ;-)
"John Doe" <johndoe@nothing.edu> wrote in message
news:fdF_f.1323$An2.1310@newsread2.news.pas.earthlink.net...
I don't recall the formula for simple harmonic motion
let's say we have a ball that oscillates and moves a total distance of 5 m
from its low point to high point (so amplitude is 2.5?). it takes 7
seconds to reach its low point (so period is 7?). If at t = 0 ball is at
its low point what is the formula?
is it y = -2.5 cos (something)
-2.5 because at time t = 0 it's at its low point but what is that
something in parentheses? I don't remember the formula. Also, can we
express it in terms of sin??
.
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| User: "Edward Green" |
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| Title: Re: simple harmonic motion |
11 Apr 2006 12:26:21 AM |
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John Doe wrote:
I don't recall the formula for simple harmonic motion
let's say we have a ball that oscillates and moves a total distance of 5 m
from its low point to high point (so amplitude is 2.5?). it takes 7 seconds
to reach its low point (so period is 7?). If at t = 0 ball is at its low
point what is the formula?
is it y = -2.5 cos (something)
-2.5 because at time t = 0 it's at its low point but what is that something
in parentheses? I don't remember the formula. Also, can we express it in
terms of sin??
We could say that because of sin, we all vacillate around low points,
.
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| User: "tadchem" |
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| Title: Re: simple harmonic motion |
11 Apr 2006 04:30:14 AM |
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Edward Green wrote:
<snip>
We could say that because of sin, we all vacillate around low points,
As my cis used to say, "'Cos why?"
Tom Davidson
Richmond, VA
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| User: "" |
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| Title: Re: simple harmonic motion |
11 Apr 2006 12:36:37 AM |
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In article <1144733181.388197.71360@u72g2000cwu.googlegroups.com>, "Edward Green" <spamspamspam3@netzero.com> writes:
John Doe wrote:
I don't recall the formula for simple harmonic motion
let's say we have a ball that oscillates and moves a total distance of 5 m
from its low point to high point (so amplitude is 2.5?). it takes 7 seconds
to reach its low point (so period is 7?). If at t = 0 ball is at its low
point what is the formula?
is it y = -2.5 cos (something)
-2.5 because at time t = 0 it's at its low point but what is that something
in parentheses? I don't remember the formula. Also, can we express it in
terms of sin??
We could say that because of sin, we all vacillate around low points,
Now just call it "the harmonic faith" and start collecting
donations:-)
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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