# Density of a nickel

1. Feb 22, 2008

### n77ler

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

A 1938-nickel has a diameter of 2.11×10-2 m, a thickness of 1.95×10-3 m, and weighs 4.94×10-2 N.
What is its density?

2. Relevant equations
density=m/v ??? or density =w/vg

3. The attempt at a solution

cant find the volume, I feel like I should drop out of university it's the simplest problem and I'm completely stuck.

v= pir^2 ???

2. Feb 22, 2008

### Kurdt

Staff Emeritus
The nickel is circular so the area of the circle is $A=\pi r^2$, which you will multiply by the thickness to get the volume.