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Homework question

  1. Feb 25, 2006 #1
    if atmospheric pressure is 730mm of mercury, what is this in pascals..?

    based on my study guide 1atm = pgh

    = 13,590 kg/m(cube) * 9.807 N/kg * 0.76m

    = 101,300Pa

    do i calculate it as such :

    = 13,590 kg/m(cube) * 9.807 N/kg * 0.73m...?

    my answer does not tally as the guide's answer states 96000Pa

    i even tried by g = 10N/kg instead of 9.807 (if less accuracy is needed)...
    but my answer still does not tally..? i'll be able to find the pressure in atmospheres and millibars once i obtain the calculating method to the first problem....pls help !
     
    Last edited: Feb 25, 2006
  2. jcsd
  3. Feb 25, 2006 #2

    Hootenanny

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    There are 133.322 pascals per mm of mercury
     
  4. Feb 25, 2006 #3
    thx you so very much for the quick reply...by multiplying 133.322 pascals to 730mm (mercury) i obtained the answer 97,325.06 pascals which very close to the method i first used in the previous post (97,292.3049 pascals).
    why does my study guide state 96,000 pascals as the answer ? i'm so sorry but i have no tutor and i study by myself (very new to physics)...thx you!
     
  5. Feb 25, 2006 #4

    Hootenanny

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    I dont quite know
     
  6. Feb 25, 2006 #5
    ok thx so much though...last question...the method that i used (first post)..is it also considered a correct way of finding the answer..? are you a moderator..? should i leave this post as it is hoping someone else might be able to answer it or should i close this post once you reply to it (the 'last question')..? sorry for the trouble...thx!
     
  7. Feb 25, 2006 #6

    Hootenanny

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    Im not a moderator, it is a good idea to leave the post open as people have different specialities and are more qualified than me to answer your question, after all I am mearly a student! Your method looks fine and as the two answer are in close agreement I would expect them to be right. Check back soon to see if anyone else has added to your post.
     
  8. Feb 25, 2006 #7
    Forces & Pressure (Homework Question)

    thank you so much ! i appreciate your assistance.

    can anyone pls help me figure out why my study guide states a different answer. thx !
     
    Last edited: Feb 25, 2006
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