1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Physics problem help

  1. Oct 1, 2005 #1
    I am working on a physics problem which states:
    A person doing a chin-up 700N exclusive of the arms. During the first 25.0 cm of the lift, each arm exerts an upward force of 355 N on the torso. If the upward movement starts from resdt, what is the person's velocity at this point?

    This is probably very basic, but I am having trouble with this whole energy, work, force, tension thing.
  2. jcsd
  3. Oct 2, 2005 #2


    User Avatar
    Homework Helper

    Explain what you've tried and what equations are relevent. Have you drawn a free body diagram and labeled the forces?
  4. Oct 3, 2005 #3
    You should have these formulas, derive an expression for final velocity and then plug in your numbers

    Kf – Ki + Uf – Ui = Wnc
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook