how to find equation?

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Nov 14th 2012, 04:32 PM
ahmedb

how to find equation?

Google Image Result for http://www.eetasia.com/IMAGES/EEOL_2008MAR15_POW_NT_01_fig1.jpg

how can i get the equation of the function in red?
Nov 14th 2012, 04:49 PM
skeeter

Re: how to find equation?

looks like a basic sine wave with amplitude of 175 and period of 50 ...

$V(x) = 175\sin\left(\frac{\pi x}{25}\right)$

http://www.eetasia.com/IMAGES/EEOL_2...NT_01_fig1.jpg
Nov 14th 2012, 04:58 PM
ahmedb

Re: how to find equation?

Quote:

Originally Posted by skeeter

looks like a basic sine wave with amplitude of 175 and period of 50 ...

$V(x) = 175\sin\left(\frac{\pi x}{25}\right)$

http://www.eetasia.com/IMAGES/EEOL_2...NT_01_fig1.jpg

How did you get the period of pi/25??
isn't the period 50?
Nov 14th 2012, 05:08 PM
skeeter

Re: how to find equation?

did you not read the first line in my post?

Quote:

looks like a basic sine wave with amplitude of 175 and period of 50 ...

fyi, $\frac{\pi}{25}$ is not the period ...

I recommend you research the role of the value $B$ in the equation $y = A\sin(Bx)$ .
Nov 14th 2012, 05:28 PM
ahmedb

Re: how to find equation?

Quote:

Originally Posted by skeeter

did you not read the first line in my post?

fyi, $\frac{\pi}{25}$ is not the period ...

I recommend you research the role of the value $B$ in the equation $y = A\sin(Bx)$ .

nvm got it, lol, 2pi/50 is B, correct?
Nov 14th 2012, 05:31 PM
skeeter

Re: how to find equation?

Quote:

Originally Posted by ahmedb

nvm got it, lol, 2pi/50 is B, correct?

that's what my post stated.
Nov 14th 2012, 05:31 PM
ahmedb

Re: how to find equation?

Quote:

Originally Posted by skeeter

that's what my post stated.

yep, thanks alot!! any "like" or thanks button on this forum?
Nov 15th 2012, 06:51 AM
ahmedb

Re: how to find equation?

how can you convert it to cos?
Nov 15th 2012, 09:33 AM
Aryth

Re: how to find equation?

Pretty simply. $sin(u) = cos\left(\frac{\pi}{2} - u\right)$

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