# What is the period of oscillation?

1. Jul 3, 2012

### duhduhduh

A mass of 361 grams is hung from the bottom of a vertical spring and the spring stretches 64.3 cm. The hanging mass is removed, and the spring is placed horizontally on a frictionless table. One end of the spring is held fixed and the other end is attached to a 649 gm mass. The 649 gm mass is then pulled to a distance of 64.3 cm and released from rest. What is the period of oscillation of this mass/spring system?

Just starting these types of SHM problems. How do I go about solving this?

2. Jul 3, 2012

### Staff: Mentor

(Does this one belong in the homework forums?)

You have enough information here to calculate the spring constant of the spring; and once you know the spring constant you can calculate the period of oscillation on frictionless horizontal table for any given mass.

3. Jul 3, 2012

### duhduhduh

Sorry, and thanks for your help. How do I solve for the spring constant?

4. Jul 3, 2012

### Xiao10

You know both the force applied to the spring from the hanging mass as well as the extension.

5. Jul 3, 2012

### duhduhduh

Ok, so I get k = 5.50 from F = kx

Then use T = 2pi*sqrt(m/k)

What is gm as a unit of mass?

6. Jul 3, 2012

### Xiao10

Fairly sure it means gram.

7. Jul 3, 2012

### Integral

Staff Emeritus