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!

Sphere rolling down a ramp problem

  1. Jul 23, 2009 #1
    1. The problem statement, all variables and given/known data
    A solid sphere of uniform density (weight = 3.2 lbs starts from rest and rolls down a ramp (H = 1.57 m, q = 18.3°.)

    Find the speed of the sphere's CM when it reaches the bottom of the ramp.

    haha sorry bout that....

    2. Relevant equations

    see below

    3. The attempt at a solution
    i dont' know whats wrong with my set up here,
    m*g*d*sin(theta) = .5mv^2 + (2/5)(.5)mv^2

    any help?

    thanks!
     
    Last edited: Jul 23, 2009
  2. jcsd
  3. Jul 23, 2009 #2

    jgens

    User Avatar
    Gold Member

    It might help if we knew what the question was!
     
  4. Jul 23, 2009 #3
    Ops... forgot to add the question. silly me >.<
     
  5. Jul 23, 2009 #4

    jgens

    User Avatar
    Gold Member

    Your conservation of energy equation looks wonky. If I'm doing this right, you should have that m*g*h = (0.5)mv2 + (2/5)*(0.5)mv2. You're already given the height of the ramp!
     
  6. Jul 23, 2009 #5
    i hate when they put extra information in it, you just feel obligated to use it.

    yes your right, thanks alot for the help!
     
  7. Jul 23, 2009 #6

    jgens

    User Avatar
    Gold Member

    You're welcome! :)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Sphere rolling down a ramp problem
  1. Ball rolling down a ramp (Replies: 10)

Loading...