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For problems like these, units are really important and for your number 2 answer of "53,125 lbs" is definitely incorrect. The answer is 53,125 (pi) ft*lbs. Since ft*lbs is unit for work ( Work = Force * Distance; ft*lbs = (volume (ft^3)*density (lbs/ft^3)) * ft ) ).
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"Even if you prove me wrong, I'm not going to believe you." - A. McGill
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