(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Suppose that you wish to fabricate a uniform wire out of 0.900 g of copper. If the wire is to have a resistance R = 0.700 ohm, and if all of the copper is to be used.

(a) What will be the length of the wire? M

2. Relevant equations

R = pL/A

R = .700 ohm and p = 1.7 x 10^-8

3. The attempt at a solution

first thing i did was input the given number

.700 = (1.7x10^-8)L/A

my main problem is finding A with the given weight of copper, but this is what i did.

n = m/M = .900/63.54 = .0142 then,

.0142(6.02x10^23) = 8.53 x 10^21

this is where i get lost because to get A its A = DeltaQ/DeltaT but time was never a given and i believe its not needed.

(8.53 x 10^21) x (1.6 x 10^-19) = 1364.8

I know there are other ways to get "A" by A = DeltaV/R but Volts were never given.

Any help on this would be great.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Stuck on converting

**Physics Forums | Science Articles, Homework Help, Discussion**