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July 24, 2014

July 24, 2014

Posted by **Andrea** on Wednesday, January 30, 2008 at 6:14pm.

Find the following for when t=0, T/4, T/2, 3T/4, and T:

displacement

speed

restoring force (F=kx)

acceleration (a=F/m)

kinetic energy (1/2mv^2)

potential energy (1/2kx^2)

For t=0s I got: .2m, 0m/s, .4N, .8m/s^2, 0J, and .04J respectively. I got this first by finding the spring constant using this equation: T= 2*pi*(sqrt(m/k)) Thus k= roughly 2

Is this correct? Then I have trouble figuring out the rest because t= T/4 confuses me and I can't find the displacement at this particular time.

- Physics -
**bobpursley**, Wednesday, January 30, 2008 at 7:21pmYou have the wrong equation...

Displacement=20cos wt where

w=2PI *f=2PI/T= 2

displacement= 20 cos 2t

Now calculate displacement as a function of t.

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