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January 29, 2015

January 29, 2015

Posted by **love** on Thursday, January 19, 2012 at 10:59pm.

- Chemisty -
**DrBob222**, Thursday, January 19, 2012 at 11:13pmI would change 0.0808 inches to cm and 3 pounds to grams. 2.54 cm = 1 inch and 453.6 g/lb, then 0.0808 in x (2.54 cm/in) = ?

and 3 pounds x (453.6 g/lb)= ?

The area of the wire is pi*r^2.

Volume = pi*r^2*length of wire

So if you know volume, pi, and r you can calculate length. Volume = mass/density = mass (grams)/density.

Solve for length in cm and convert to m

- Chemisty -
**love**, Thursday, January 19, 2012 at 11:19pmso i would 0.0808 in x (2.54 cm/in) = 2.6E-1

3 pounds x (453.6 g/lb)= 1.4E3

SO THAN WHAT DO I DO NEXT

- Chemisty -
**DrBob222**, Thursday, January 19, 2012 at 11:31pm0.0808 2.54 is not 0.26 and you shouldn't round to two places. You are allowed 3. My calculator reads about 0.205 cm. That's the diameter so take half of that to arrive at the radius. You've rounded 453.6 x 3 too much. I would keep it as 1360.8 grams. You can round later.

Next you calculate volume.

Volume = mass/density = 1360.8/2.70 = ?

Then V = pi*r^2*length

V from above.

pi = 3.14

r from above and square it.

Length. Solve for this.

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