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!

Need help with a problem

  1. Jul 22, 2005 #1
    A skier of mass 64 kg is pulled up a slope by a motor-driven cable. How much work is required to pull him 80 meters up a 30 degree slope (assumed frictionless) at a constant speed of 3.1 meters/second? [answer is to be in joules]

    Ok, so the equation I am using is W = (Fcos(theta))*delta x

    I tried using the values above and I've done it over and over and still came up with the same number.

    W = ((3.1*64)*cos30)*80

    = 13745.6

    Am I missing something obvious? Thanks in advance for any helpful suggestions.
  2. jcsd
  3. Jul 22, 2005 #2


    User Avatar
    Homework Helper

    If there was no slope, a force of what magnitude would be required to keep up a constant speed?
    And as dW = F dx, how much work would be required for the 80m trip?

    Hope this helps you figure out what you did wrong :).
    Last edited: Jul 22, 2005
  4. Jul 22, 2005 #3
    Ok, I got it . . .Thank you.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Need help with a problem