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!

Physics help KE, W, PE

  1. Feb 27, 2007 #1
    https://mywebspace.wisc.edu/dxiong4/physics 1.bmp?uniq=-w1zg99

    for part b i am to find work of gravity, and to do so what i did was

    mass*gravity*cos 22*distance(12) to get 436.14, but it seems that it is wrong

    i've tried mass*gravity*distance (12)=470.4 and still is not the correct answer, can someone plz explain to me what i am doing wrong? thx
  2. jcsd
  3. Feb 28, 2007 #2


    User Avatar
    Staff Emeritus
    Science Advisor

    Check the red part; you want the component of the weight acting parallel to the slope.
  4. Feb 28, 2007 #3


    User Avatar
    Staff Emeritus
    Science Advisor

    Conversely, you want the upward component of displacement-
    [itex]sin(\theta)[/itex], not [itex]cos(\theta)[/itex]. It's the same as cristo's point.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Physics help KE, W, PE
  1. PE and KE (Replies: 12)

  2. Ke/pe Vehicle Help (Replies: 1)

  3. PE and KE (Replies: 2)

  4. KE and PE (Replies: 3)