Physics
posted by Eden .
A 0.70 kg mass at the end of a spring vibrates 4.0 times per second with an amplitude of 0.15 m.
Determine the velocity when it passes the equilibrium point.
Determine the velocity when it is 0.11 from equilibrium.
Determine the total energy of the system.

Physics 
Eden
sorry, .11 m from equilibrium.

Physics 
bobpursley
start with the basic equations.
x=A*sinwt
v= Aw*coswt
a= Aw^2sinwt
at the equilibrium point wt is PI (cosine is max), so VAw you know A, and w=2PI/Period, and period is given (.25sec).
when position is .11,
.11=Asinwt solve for wt, then v= Awcoswt
energy? 1/2 m v^2 where v is vmax, or Aw 
Physics 
Eden
what is Pl?

Physics 
bobpursley
PI is 3.14159...

Physics 
Eden
oh... pi... thanks

Physics 
Anonymous
how do you know period is .25 sec?

Physics 
Anonymous
frequency is four times per second! (1 sec divided by four times is .25)
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