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!

Incorrect Pressure

  1. Mar 28, 2010 #1
    1. The problem statement, all variables and given/known data
    A crate, whose bottom surface is 50.4 cm by 28.3 cm, exerts a pressure of 2.50x10^3 Pa on the floor. What is the mass of the crate.


    2. Relevant equations
    P=F/A
    m=weight/gravity (9.80)


    3. The attempt at a solution
    2.50x10^3 F
    ------------=----------------
    1 1.4x10^3 cm^2


    F=3.5x10^6

    m=weight/9.80

    m=3.5x10^6
    -----------
    9.80


    Answer: 3.6x10^5 kg

    I feel as though I made a mistake somewhere...
     
  2. jcsd
  3. Mar 28, 2010 #2

    rl.bhat

    User Avatar
    Homework Helper

    You have convert the length and the width from cm to meter.
     
  4. Mar 28, 2010 #3
    so I would multiply 2.50x20^3 by .787 (.283m+.504m)?
     
  5. Mar 28, 2010 #4

    rl.bhat

    User Avatar
    Homework Helper

    What is the formula for area?

    .787 (.283m+.504m)
    What is this?
     
  6. Mar 28, 2010 #5
    lxw?
     
  7. Mar 28, 2010 #6
    A=lxw

    So.. (.283m x .504m)= 0.119952. I am not sure about the units, but is this the correct answer?
     
  8. Mar 28, 2010 #7
    would it be meters squared (m^2)?
     
  9. Mar 28, 2010 #8

    rl.bhat

    User Avatar
    Homework Helper

    Now it is correct. Unit of the area is m^2.
    Now F = P*A = ........?
     
  10. Mar 28, 2010 #9
    F=299.88N

    so....

    m=weight/9.80

    therefore m=299.88N/9.80 m/s^2

    mass equals.... 30.6kg

    Correct?
     
  11. Mar 28, 2010 #10

    rl.bhat

    User Avatar
    Homework Helper

    Correct.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Incorrect Pressure
  1. Incorrect calculator? (Replies: 3)

Loading...