# Sorry I need so much help, my tutor is done for the semester!

1. Jul 3, 2008

### Kris1120

1. The problem statement, all variables and given/known data

A spring is hung from the ceiling. A 0.483-kg block is then attached to the free end of the spring. When released from rest, the block drops 0.176 m before momentarily coming to rest. (a) What is the spring constant of the spring? (b) Find the angular frequency of the block's vibrations.

2. Relevant equations

(a) F = kx
(b) omega = sq rt(k/m)

3. The attempt at a solution

(a) k = mg/x
= (0.483 kg)(9.81 m/s) / 0.176 m
= 26.8943 N/m

(b) sq rt( 26.8943 N/m / 0.4383 kg) = 7.83329 rad/s

2. Jul 3, 2008

### cryptoguy

well your logic looks right, i did the calculation for part a and got 26.92, not sure if that's where your mistake is...

3. Jul 3, 2008

### tiny-tim

Hi Kris1120!

Nooo …

The acceleration is not zero, is it?

Use conservation of energy.

4. Jul 3, 2008

### cryptoguy

oooohhhh yeaaaa.... i forget a lot after 2 months of no physics... acceleration is at a max when the block is momentarily not moving