Recent content by mp9191

  1. M

    Using Hooke's Law and Elastic Potential Energy equations

    Ah, I see. I was overlooking the fact that W=Fxcos theta is only valid for constant forces. Your explanation was very clear. Thank you for the help!
  2. M

    Using Hooke's Law and Elastic Potential Energy equations

    I'm just having a bit of trouble understanding when to use F=kx and when to use W=.5kx^2 . I understand that Hooke's law is for the spring force and elastic PE is obviously for work, but you could use either one of these equations to solve for, for example, k: When solving for the spring...
  3. M

    Conservation of Linear Momentum problem

    Oh, my bad. In part a) that should be 4.9 not 4.5. Thank you! I thought I was going insane because I was like...there's no way it can be 2.15...
  4. M

    Conservation of Linear Momentum problem

    1. Problem A 2.3 kg cart is rolling across a frictionless, horizontal track towards a 1.5 kg cart that is initially held at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts...