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Math Help - leaky sandbagt

  1. #1
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    Post leaky sandbagt

    bag of sand with original weight 144 lb..
    lifted in cnst rate & leaks in cnst rate ..
    it was 1/2 weight (72 lb) when lifted up to 18ft ....
    how to find work done this far ....

    i did set the integral from 0-18
    but cant find f(x)

    any help pls.
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  2. #2
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    Quote Originally Posted by alex83 View Post
    bag of sand with original weight 144 lb..
    lifted in cnst rate & leaks in cnst rate ..
    it was 1/2 weight (72 lb) when lifted up to 18ft ....
    how to find work done this far ....

    i did set the integral from 0-18
    but cant find f(x)

    any help pls.
    ill try and help lol.
    f(o)=144 lbs, f(18)=72, therefore f(x)=144-(72/18)x. Next u take the integral of that and taking the integral from 0-18 u get 144x-2x^2 |0-18
    giving u an answer of 1944 ftlbs.
    im assuming u can take the intrgral by urself so i didnt explain that to much. does that answer ur question?

    lol what book are u using, i had the same problem?
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  3. #3
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    Thumbs up thanks 4 ur help tha was fast

    thank u yes it does help ..
    i was just looking 4 [f(o)=144 lbs, f(18)=72, therefore f(x)=144-(72/18)x]
    i can deal with the integral
    thanks again
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  4. #4
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    Cool book

    im using THOMAS CALCULUS EARLY TRASCENDENTALS

    i dont think its a great one cuz it doesnt explain alot

    do u have any other book thats more helpful for calc

    thnx
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  5. #5
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    Quote Originally Posted by alex83 View Post
    im using THOMAS CALCULUS EARLY TRASCENDENTALS

    i dont think its a great one cuz it doesnt explain alot

    do u have any other book thats more helpful for calc

    thnx

    im using Calculus Early Vectors by Stewart its an alright book but i usually get help from my professors office hours but those are only like two days a week so i get on here for help lol. I understand most of what is taught to me on here.
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