1. Not finding help here? Sign up for a free 30min 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!

Finding weight

  1. Oct 27, 2007 #1
    1. The problem statement, all variables and given/known data
    What is the weight of a column of water 7 ft high with a radius of 1.1m?
    The density of the water is 1000 kg/m/m/m
    Answer in units of N.


    2. Relevant equations

    Volume = pi * r^2 * h
    7 ft = 2.1336 m
    Weight = Volume * Density

    3. The attempt at a solution
    Volume = 3.14 * 1.1^2 * 2.1336 = 8.1064 m^3

    Weight = 8.1064 m^3 * 1000 kg/m^3
    Weight = 8106.39984 kg

    1 Newton = kg * m/s2

    i'm stuck here
     
    Last edited: Oct 27, 2007
  2. jcsd
  3. Oct 27, 2007 #2

    hage567

    User Avatar
    Homework Helper

    Your formula is not quite right.

    It should be: Mass = Volume * Density

    Mass is expressed in kilograms.

    The weight of an object is equal to its mass multiplied by g, where g is the acceleration due to gravity (9.81 m/s^2). Weight is expressed in Newtons.
     
  4. Oct 28, 2007 #3
    As stated above, take this as mass and multiply it by gravity, which will either be 9.81 or 10 depending on your level.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Finding weight
  1. Weights of samples (Replies: 4)

  2. Tensions and Weights! (Replies: 16)

Loading...