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Math Help - Application to Physics and Engineering Example (not asking to solve, just explain!)

  1. #1
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    Application to Physics and Engineering Example (not asking to solve, just explain!)

    Hey! This is my first time using these forums so I appologize if I'm not following the proper protocol. I'll delete the thread once I get an explanation for my question. I'm just confused about a step in an example in the book. The question with pictures can be found on this PDF on page 8 with their solution: http://cims.nyu.edu/~kiryl/teaching/...ngineering.pdf
    If you don't trust links the question is: EXAMPLE: Find the hydrostatic force on one end of a cylindrical drum with radius 3 ft if the drum is
    submerged in water 10 ft deep. At one point in their explanation they state that the pressure on the strip is approximately 62.5(7 - yi*). I have no idea where this 62.5 value came from. Could you guys explain? Thanks in advance!
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  2. #2
    MHF Contributor Unknown008's Avatar
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    Re: Application to Physics and Engineering Example (not asking to solve, just explain

    62.427 is the density of water in pounds per cubic foot.

    Though I will admit that I'm not sure why it's taking only the density and the depth while the pressure formula is given by P=h\rho g

    h = height or depth
    rho is the density of the liquid
    g is the acceleration due to gravity (which has been omitted in the pdf.)

    EDIT: Okay, the conversion I used included gravity in the calculations
    Last edited by Unknown008; September 23rd 2011 at 04:17 AM.
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  3. #3
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    Re: Application to Physics and Engineering Example (not asking to solve, just explain

    Quote Originally Posted by Unknown008 View Post
    62.427 is the density of water in pounds per cubic foot.

    Though I will admit that I'm not sure why it's taking only the density and the depth while the pressure formula is given by P=h\rho g

    h = height or depth
    rho is the density of the liquid
    g is the acceleration due to gravity (which has been omitted in the pdf.)
    lbs/ft^3 is weight density = (mass density)g ... "g" is already figured in
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