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!

What is the mass of the car?

  1. Feb 2, 2005 #1
    An automobile traveling 25km/hour has kinetic energy equal to 1*10(6 power)J
    all i know is KE=mass*km/hour
    What is the mass of the car?
     
    Last edited: Feb 2, 2005
  2. jcsd
  3. Feb 2, 2005 #2
    Mm...check your equation.

    [tex]E_{K}=\frac{1}{2}mv^{2}[/tex]

    Isolate mass in this equation and substitute the information you have for the other variables. Remember that for kinetic energy to be in joules, mass must be in kilograms and velocity in meters per second.
     
  4. Feb 2, 2005 #3

    Doc Al

    User Avatar

    Staff: Mentor

    No, KE = [itex]1/2 m v^2[/itex]. (Momentum is mass x speed; kinetic energy is a different thing altogether.) Be sure to use standard units: convert km/hour to m/s; mass will be in kg.
     
  5. Feb 2, 2005 #4

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper



    To add a little bit,the thing i underlined it is completely incorrect,because u have multiplied a unit with a physical quantity and got another physical quantity...That cannot be true... :wink:

    Daniel.
     
  6. Feb 2, 2005 #5
    the equation is KE=1/2mv(squared)
     
  7. Feb 2, 2005 #6
    If I take these steps will I be able to find the mass of the car?
     
  8. Feb 2, 2005 #7

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    Provided u work correctly,of course...

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

Have something to add?



Similar Discussions: What is the mass of the car?
  1. Masses on a car (Replies: 1)

  2. Mass of the Car? (Replies: 5)

Loading...