1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Power of a Pump draining a flooded basement

  1. Mar 29, 2008 #1
    1. The problem statement, all variables and given/known data

    Water is pumped steadily out of a flooded basement at a speed of 5.7m/s, through a uniform hose of radius 1.01cm. The hose passes through a window 2.96m above the waterline. What is the power (in W) delivered by the pump?

    2. Relevant equations

    Continuity and Bernoulli principles

    3. The attempt at a solution

    By using the radius, the cross sectional area is found to be 3.2047 * 10^-4 m^2.
    Multiply this by the velocity to find the flow rate I got: .001827 m^3/s or 1.827 kg/s.
    Multiply this by gravity (9.8 m/s^2) and the height (2.96m), I got 52.99 Watts.

    I don't know where I made a mistake, please help!
  2. jcsd
  3. Mar 30, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    Your method is right but I get 54.07 ( how many figures did you carry through the calcs?)
  4. Mar 30, 2008 #3
    I tried 54.07 W but it's not correct either.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook