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!

Pressure= Force/ Area

  1. Nov 17, 2011 #1
    1. The problem statement, all variables and given/known data

    6. A person weighing 900 N is standing on snowshoes. Each snowshoe has an area of 2500 cm2. Find the pressure on the snow.

    a. 0.18 Pa
    b. 0.36 Pa
    c. 1800 Pa
    d. 3600 Pa

    2. Relevant equations

    P=F/A

    3. The attempt at a solution

    I tried doing F/(2*(A))
    A=2500cm2/1002cm2 *1m2=.25
    P=900/(2+.25)
    P=1800

    but the answer key says it it .18 instead
     
  2. jcsd
  3. Nov 17, 2011 #2
    A Pascal is 1 Newton per square meter. I agree with your answer.
     
  4. Nov 17, 2011 #3
    Nope ignore me
     
  5. Nov 17, 2011 #4

    sophiecentaur

    User Avatar
    Science Advisor
    Gold Member

    physgrl
    Your answer looks right to me (if you want the answer in Pa) - it can be done in your head. You didn't actually put in the units for your answer so you are strictly not right or wrong - your answer is just incomplete.
    The pressure in N/cmsq is 0.18 but which unit is given in the mark scheme?
     
  6. Nov 17, 2011 #5
    The answers are all in Pa
     
  7. Nov 17, 2011 #6

    sophiecentaur

    User Avatar
    Science Advisor
    Gold Member

    So you are right and 'the answer' looks wrong.
     
  8. Nov 17, 2011 #7
    Ok lol
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook