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Homework Help: Avg. water velocity

  1. Nov 8, 2007 #1
    1. The problem statement, all variables and given/known data

    Water is pumped into a storage tank from a well delivering 17.0 gallons of water in 29.0 seconds through a pipe of 1.00 in.^2 cross-sectional area. What is the average velocity of the water in the pipe as the water is pumped from the well?


    the answer should be in inches/second.

    I converted 17gal./s. to 22m^3/s = 866.14in^3/s, but i'm not sure what equation i need to use to get started.

    Some assistance getting started would be appreciated.

  2. jcsd
  3. Nov 8, 2007 #2


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    Homework Helper

    Volume of water = area of cross section of pipe x length of the water tube.
    Therefore V/s = Area x L/s
  4. Nov 8, 2007 #3
    In February 1955, a paratrooper fell 370 m from an airplane without being able to open his chute but happened to land in snow, suffering only minor injuries. Assume that his speed at impact was 58 m/s (terminal speed), that his mass (including gear) was 85 kg, and that the force on him from the snow was at the survivable limit of 1.2 105 N.

    (a) What is the minimum depth of snow that would have stopped him safely?


    (b) What is the magnitude of the impulse on him from the snow?

    ? kg·m/s

    can some one HELP ME ON THIS PROBLEM???
  5. Nov 8, 2007 #4
    I didn't understand rl.bhat's explanation. What's V/s? Also the length of tube is NOT given. Can someone explain please?
  6. Nov 8, 2007 #5
    v/s is velocity over displacement.
  7. Nov 8, 2007 #6
    no volume/seconds
  8. Nov 9, 2007 #7


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    Homework Helper

    Average velocity = (Volume/Second)/Area
    You have calculated volume of water. Time is given. Find the average velocity.
  9. Nov 9, 2007 #8
    yup L/S is the velocity like how rl.bhat put it in the second post.
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