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A chain lying on the ground is 12ft long and weighs 110lbs.

Hi, I have a problem with one of my assignments,

The question is:

A chain lying on the ground is 12 ft long and weighs 110 lbs. How much work is required to raise one end of the chain to a height of 7ft?


My answer was 2200.916667,

I only get 1/2 marks for it. I wonder what i'm doing wrong. Thanks for any help!

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4 comments
  • i did integral(0,7) 110/12 * 9.8 * (7-h)dh which gives me 2200.916667. This answer got 1/2 Marks, for some reason your answer got 0/2.
    • Sugarnutzzz
    • Jun 06, 2018 at 2:12pm
  • Your quantities are in imperial units. So, g will be 32.2 feet/s^2, instead of 9.8 m/s^2.
    • TanujMathur
    • Jun 06, 2018 at 2:15pm
  • What units do you want in your answer? Imperial or SI?
    • TanujMathur
    • Jun 06, 2018 at 2:16pm
  • 9804.70 is the answer in Joule
    • TanujMathur
    • Jun 06, 2018 at 2:18pm

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