- anonymous

The density of copper is 559 lb_m/ft^3. What is the mass of the copper pipe in pounds? A copper pipe, used for plumbing from the water main to a house, is 5 meters long and has a circular cross-section 3.2 cm in diameter. There is a 2.4 cm diameter hole in the center of the cross-section for the entire length of the rod.

- schrodinger

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- Mertsj

I solved this for you yesterday. Why are you posting it again?

- anonymous

it wasnt right

- Mertsj

What is the answer?

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## More answers

- anonymous

you gave me 34.7, my software rejected it

- Mertsj

And why do you have that underscore after the lb_ ?

- anonymous

|dw:1328838221094:dw|

- Mertsj

lb_m/ft^3
What does that mean?

- anonymous

|dw:1328838314615:dw|

- Mertsj

|dw:1328838358865:dw|

- anonymous

pounds in mass

- Mertsj

Is that different from pounds?

- anonymous

yeah i think. im not quite sure what the conversion is but i think its different

- Mertsj

Maybe I'll google it.

- anonymous

i think its something like 1lb_m = 2.2 kg/m^3

- Mertsj

According to Wikipedia it's the same thing.

- Mertsj

I'll work the problem again and see if I get a different answer.

- anonymous

ok thank you

- Mertsj

This time I got .983 pounds
How many decimal places do you need?

- Mertsj

How many times can you put it into your software?
I am going to do it again to double check.

- anonymous

unlimited

- anonymous

until i get it right

- Mertsj

I got the same thing again and I did it a different way.
.983444164 lbs

- Mertsj

Are you going to put it in and see if its right? I would like to know.

- anonymous

i tried. it also rejected that answer

- Mertsj

How many decimal places did you enter? Is there instructions for that?

- anonymous

i entered all decimals

- Mertsj

Maybe you should try 1 pound since they gave the density to the nearest pound. Or maybe try two significant digits since that's the number of significant digits in the diameter measurement.

- Mertsj

Or maybe three significant digits since the density has 3 significant digits.

- anonymous

yeah it rejected both again

- anonymous

guess i will have to figure out something else

- Mertsj

What class is this? maybe it's a calculus problem or something.

- anonymous

its calc

- Mertsj

Oh gees. The density is given per cubic foot. I have to recalculate.

- anonymous

ok

- anonymous

are you there?

- Mertsj

yes

- Mertsj

I found an online volume calculator for pipe. It allows me to put in the diameter in cm the length in m and get the volume in cubic feet. So I put them in, subtracted and got .06213 cubic feet and it came out to 34.73 lbs.

- Mertsj

So maybe try 35 pounds or 34.73

- Mertsj

Also I found online that the density of copper is 556 pounds per cubic ft. There isn't a typo in the problem is there?

- anonymous

guess it wanted me to round the whole time, it took 35..wow

- anonymous

can't believe it was that picky

- Mertsj

Thank goodness. This was driving me crazy.

- anonymous

thanks for the help very much

- Mertsj

You're welcome. Good luck in all your studies.

- anonymous

thank you. you too

- Mertsj

ty

- anonymous

take care

- Mertsj

you too.

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