Diameter

Algebra

Diameter

Postby Guest » Mon Nov 05, 2018 8:52 pm

A piece of copper is 4 in. in length, 2 in. in width, and 1/2 in. thick is formed into a wire 100 yds. in length and uniform thickness. Find diameter of wire.

Volume of copper = 4 * 2 * .5 = 4 cu. in.

Length of wire = 100 * 3 * 12 = 3600 in.

Wire is a cylinder: Volume of cylinder = pi * r^2 * height or length.

3.1416 * r^2 * 3600 = 4

11309.76 * r^2 = 4

Not sure how to proceed - Where am I incorrect?
Guest
 

Re: Diameter

Postby Guest » Tue Nov 06, 2018 10:41 am

[tex]3.1416 * r^2 * 3600 = 4[/tex]

[tex]3.1416 * r^2 * 900 = 1[/tex]


[tex]r^2 = \frac{1}{2827.44}[/tex]


[tex]r = \frac{1}{53.174}[/tex]

[tex]r = 0.019[/tex] in
Guest
 

Re: Diameter

Postby Guest » Tue Nov 06, 2018 2:48 pm

Thanks.
Guest
 


Return to Algebra



Who is online

Users browsing this forum: Google [Bot] and 1 guest