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How many feet of solid copper wire with circular cross

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Curly05
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How many feet of solid copper wire with circular cross [#permalink] New post   Updated on: 03 Aug 2003, 11:56
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How many feet of solid copper wire with circular cross sections .008 foot in diameter can be made from 1 cubic foot of copper?


Do we start Is foot and feet the same?
Does area or circumference play a role?




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Originally posted by Curly05 on 03 Aug 2003, 10:35.
Last edited by Curly05 on 03 Aug 2003, 11:56, edited 1 time in total.
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stolyar
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Re: How many feet of solid copper wire with circular cross [#permalink] New post   03 Aug 2003, 11:03
X is lenght of wire that is a cilinder

Volume=pi*0.0016*X=1
X=1/pi*0.0016=approx=1/0.005=1000/5=200 feet
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Curly05
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Re: How many feet of solid copper wire with circular cross [#permalink] New post   03 Aug 2003, 11:56
This is hard.

Actually you got my solution, except you picked up the cue of volume. :wink:

The answer is 62,500/ pi
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Re: How many feet of solid copper wire with circular cross [#permalink] New post   03 Aug 2003, 16:12
X is lenght of wire that is a cilinder

Volume=pi*(0.004)^2*X=1
X=1/pi*0.004*0.004= 62500/pi feet.

I guess, Saylor fell in the trap of faction multiplication.
Otherwise, His/Her approach is correct. I have also
fallen into similar kinds of traps before. Hope I won't fall
during my real GMAT.
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Re: How many feet of solid copper wire with circular cross [#permalink] New post   03 Aug 2003, 22:31
stolyar wrote:
X is lenght of wire that is a cilinder

Volume=pi*0.0016*X=1
X=1/pi*0.0016=approx=1/0.005=1000/5=200 feet


I missed a zero
its diameter is 0.008; its radius 0.004; squared = 0.000016
1/0.000016*pi=1/0.00005=100000/5=20000 feet



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Re: How many feet of solid copper wire with circular cross [#permalink]
03 Aug 2003, 22:31
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