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!

Acceleration due to gravity

  1. Oct 25, 2011 #1
    Hello, i'm currently doing some work on the above and have ran into a problem when calculating the Time squared part as it should be in Seconds squared.

    I currently have the time in miliseconds, so say I have

    150ms should I square this number then convert it into seconds or convert it first and then square it.

    For example 150ms the first way gives 22500 which is 22.5s

    Converting it to 0.150s then squaring it gives 0.0225?

    Thanks
     
  2. jcsd
  3. Oct 25, 2011 #2

    Doc Al

    User Avatar

    Staff: Mentor

    (150ms)2 = (0.150s)2 = (0.150)2(s)2 = 0.0225 s2

    Or:
    (150ms)2 = (150)2(ms)2 = (150)2(0.001 s)2 = 0.0225 s2

    Key point:
    1 (ms)2 = 10-6 s2
     
  4. Oct 25, 2011 #3
    I appreciate your help but i'm still puzzled by this.
     
  5. Oct 25, 2011 #4

    Doc Al

    User Avatar

    Staff: Mentor

    What part puzzles you?
     
  6. Oct 25, 2011 #5

    Doc Al

    User Avatar

    Staff: Mentor

    I'll try again:
    Whatever you do, you must square both the number and the units.

    No. When you square 150 ms you end up with 22500 ms2 (not just ms). You'd have to convert from ms2 to s2, which means multiplying by 10-6.

    That's fine. Notice that your units are s2.

    Personally, I would always convert to standard units before doing any calculations. So I would convert 150 ms to 0.150 s, and then I'd do my squaring.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Acceleration due to gravity
Loading...