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July 29, 2014

July 29, 2014

Posted by **~christina~** on Friday, February 22, 2008 at 2:27am.

F= (3.00N)sin(2pi*t)

The force constant of the spring is 20N/m. Determine

a) period

b) amplitude of motion

a)T= 2pi/omega

T= 2pi/ 2pi= 1s

b)A= (F

I think that..

omega= omega

b= 0

so then

A= F

My book states that a) is 1s but b) is 5.09cm which I can't seem to get.

Thanks

C

- Forced Oscillation - drwls => I need your help =) -
**~christina~**, Friday, February 22, 2008 at 2:46amUm ...actually I figured that I got omega mixed up.

so basically I got the answer.

P.S. Thanks for helping me out with my other problems drwls

- Forced Oscillation - drwls => I need your help =) -
**drwls**, Friday, February 22, 2008 at 7:19amYour equation for A in terms of F/m is not correct. The lead term should be F/k, followed by a dimensionless amplification factor that depends upon the forcing frequency, natural frequency and damping. Since you are far from resonance, the damping term can be neglected or set equal to zero.

The equations you need can be found at

http://en.wikipedia.org/wiki/Vibration#Forced_vibration_with_damping, and in most introductory physics or mechanics texts.

- Forced Oscillation - drwls => I need your help =) -
**~christina~**, Friday, February 22, 2008 at 6:47pmUm I'm confused since that is the equation I got from my textbook so why is my book incorrect drwls?

- Forced Oscillation - drwls => I need your help =) -

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