Recent content by jakec

  1. jakec

    Momentum conservation (ballistic pendulum)

    Ok, so this is what I ended up with: mgh = 1/2mv2 v=sqrt(2gh) = 1.98m/s Pi = Pf mpvpi = mbvb + mpvpf vpi = (mbvb + mpvpf) / mp vpi = 437.6 m/s Thanks for the help!
  2. jakec

    Angular Acceleration and Torque

    Great! Thanks for the help!
  3. jakec

    Angular Acceleration and Torque

    OK, so this is what I have now. I'm still a little off from the answer I should get. Any suggestions of what I can do better? (hopefully in time for finals tomorrow) T= tension ζ = torque W = weight of stuntman ∑ζ = Iα Since the tension in the cord is the only force providing torque: Tr = Iα...
  4. jakec

    Angular Acceleration and Torque

    Homework Statement To lower himself from a balcony an 80kg stuntman grabs a rope connected to a 400kg cylinder with a 1.2m diameter that is free to rotate about its axis of symmetry. What is the stuntman's acceleration as he falls? Homework Equations I missed this on a homework assignment. I...
  5. jakec

    Momentum conservation (ballistic pendulum)

    Homework Statement A .01kg bullet is fired into a 1.2kg block hanging from a 1m wire. The bullet exits the block with a speed of 200m/s and the block swings to a height of .2 meters. What is the original velocity of the bullet? What percentage of the original energy of the bullet is no longer...
Back
Top