Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Help with Conversion

  1. Oct 8, 2007 #1
    How do you get 200km/h to m/s? Do you just times that by 3.6?
  2. jcsd
  3. Oct 8, 2007 #2

    because to cancel out KM into M u must multiply by 1000, and to turn hours into seconds you must divide by 3600... therefore you must divide km/h by 3.6 to turn something into m/s
  4. Oct 8, 2007 #3


    User Avatar
    Science Advisor

    km/h * 1000m/1km * 1h/3600s = m/s
  5. Oct 8, 2007 #4


    User Avatar

    Staff: Mentor

    The idea is to carry the units along in the equations, and cancel out m/m and h/h as you go. You can multiply anything by 1, right? and 1000m/1km = 1. So multiply your original quantity by whatever form of "1" has the right ratio of units to get you closer to the answer that you want. Make sense?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook