Webassign even my ta's didn't know what to do ? and im in intro to physics

[phys-lexic]

webassign even my ta's didn't know what to do... ?... and I am in intro to physics

Homework Statement

A 33 ohm resistor is made from a coil of Cu wire whose total mass is 12g. (a)What is the diameter of the wire and (b) how long is it ? ( give you answer in m)

Homework Equations

one equation my ta tried to use was (R) = (resistivity) x (L/A)

The Attempt at a Solution

no idea... we can't figure out where to go because the equation has both length and radius (in the equation for A of the cross section of the wire) as variables... this is the only question left on my webassign and i have 30 mins left... please help

 

[Dick]

There is a mass in the problem. There's a second equation that says mass=density*volume=density*length*area.

 

[americanforest]

Two equations, two unknowns. Solve:

$$R=\rho \frac{L}{A}$$ and $$m=dV=dAL$$ where d is density and rho is resistivity