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anonymous

  • 4 years ago

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.

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  1. Mertsj
    • 4 years ago
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    I solved this for you yesterday. Why are you posting it again?

  2. anonymous
    • 4 years ago
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    it wasnt right

  3. Mertsj
    • 4 years ago
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    What is the answer?

  4. anonymous
    • 4 years ago
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    you gave me 34.7, my software rejected it

  5. Mertsj
    • 4 years ago
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    And why do you have that underscore after the lb_ ?

  6. anonymous
    • 4 years ago
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    |dw:1328838221094:dw|

  7. Mertsj
    • 4 years ago
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    lb_m/ft^3 What does that mean?

  8. anonymous
    • 4 years ago
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    |dw:1328838314615:dw|

  9. Mertsj
    • 4 years ago
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    |dw:1328838358865:dw|

  10. anonymous
    • 4 years ago
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    pounds in mass

  11. Mertsj
    • 4 years ago
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    Is that different from pounds?

  12. anonymous
    • 4 years ago
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    yeah i think. im not quite sure what the conversion is but i think its different

  13. Mertsj
    • 4 years ago
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    Maybe I'll google it.

  14. anonymous
    • 4 years ago
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    i think its something like 1lb_m = 2.2 kg/m^3

  15. Mertsj
    • 4 years ago
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    According to Wikipedia it's the same thing.

  16. Mertsj
    • 4 years ago
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    I'll work the problem again and see if I get a different answer.

  17. anonymous
    • 4 years ago
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    ok thank you

  18. Mertsj
    • 4 years ago
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    This time I got .983 pounds How many decimal places do you need?

  19. Mertsj
    • 4 years ago
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    How many times can you put it into your software? I am going to do it again to double check.

  20. anonymous
    • 4 years ago
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    unlimited

  21. anonymous
    • 4 years ago
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    until i get it right

  22. Mertsj
    • 4 years ago
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    I got the same thing again and I did it a different way. .983444164 lbs

  23. Mertsj
    • 4 years ago
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    Are you going to put it in and see if its right? I would like to know.

  24. anonymous
    • 4 years ago
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    i tried. it also rejected that answer

  25. Mertsj
    • 4 years ago
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    How many decimal places did you enter? Is there instructions for that?

  26. anonymous
    • 4 years ago
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    i entered all decimals

  27. Mertsj
    • 4 years ago
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    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.

  28. Mertsj
    • 4 years ago
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    Or maybe three significant digits since the density has 3 significant digits.

  29. anonymous
    • 4 years ago
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    yeah it rejected both again

  30. anonymous
    • 4 years ago
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    guess i will have to figure out something else

  31. Mertsj
    • 4 years ago
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    What class is this? maybe it's a calculus problem or something.

  32. anonymous
    • 4 years ago
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    its calc

  33. Mertsj
    • 4 years ago
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    Oh gees. The density is given per cubic foot. I have to recalculate.

  34. anonymous
    • 4 years ago
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    ok

  35. anonymous
    • 4 years ago
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    are you there?

  36. Mertsj
    • 4 years ago
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    yes

  37. Mertsj
    • 4 years ago
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    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.

  38. Mertsj
    • 4 years ago
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    So maybe try 35 pounds or 34.73

  39. Mertsj
    • 4 years ago
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    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?

  40. anonymous
    • 4 years ago
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    guess it wanted me to round the whole time, it took 35..wow

  41. anonymous
    • 4 years ago
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    can't believe it was that picky

  42. Mertsj
    • 4 years ago
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    Thank goodness. This was driving me crazy.

  43. anonymous
    • 4 years ago
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    thanks for the help very much

  44. Mertsj
    • 4 years ago
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    You're welcome. Good luck in all your studies.

  45. anonymous
    • 4 years ago
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    thank you. you too

  46. Mertsj
    • 4 years ago
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    ty

  47. anonymous
    • 4 years ago
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    take care

  48. Mertsj
    • 4 years ago
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    you too.

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