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 ???