# Homework Help: HELP w/ harmonics formulas

1. Feb 9, 2008

### roughneck84

I have been torturing myself with this problem for a couple weeks now and I am stumped. The unit I am working on is called simple harmonics. The question is:
Prove that the maximum speed (Vmax) of a mass on a spring is given by 2(pi)fA
I am guessing that the question wants me to re-arrange one of the formulas that was learned in this chapter but i am just lost.

Here are the formulas related to this unit.
Fx = -kx , W=1/2kx^2, T=[2(pi)r] / v , Et = 1/2mv^2 + 1/2kx^2, f = 1/2(pi) sq_rt(k/m)
or f = 1/2(pi) sq_rt a/-x

Please any help would be greatly appreciated

2. Feb 9, 2008

### G01

OK. First off are you in a calculus based course? I ask because this can be proved in one to two lines with calculus.

3. Feb 10, 2008

### roughneck84

somewhat. we learned trigonomic method. cosine law and pathagorean theorem

4. Feb 17, 2008

### roughneck84

anyone ??

5. Feb 17, 2008

### G01

Do you know how to take a derivative?

If not, then try starting the problem this way: