Recent content by jbeatphys

  1. J

    Periods and Motion of Orbits, CM and Relative Motions

    I would appreciate some clarification with the conceptual side of the problem. Am I setting up a problem where these two bodies are orbiting about the CM, or am I treating these two bodies as if they ARE the CM and the CM is orbiting about some arbitrary origin?
  2. J

    Periods and Motion of Orbits, CM and Relative Motions

    Homework Statement (a) Using elementary Newtonian mechanics find the period of a mass m1 in a circular orbit of radius r around a fixed mass m2 (solved, but placing for context). (b) Using the separation into CM and relative motions, find the corresponding period for the case that m2 is not...
  3. J

    Quadratic drag — a baseball is thrown upwards

    And thanks for correcting my misconceptions.
  4. J

    Quadratic drag — a baseball is thrown upwards

    Oops. Yes. There is nothing in contact with the ball (other than the fluid, which is air) and so there is no normal force. I meant to say gravitational force, sorry. The two forces acting upon the ball whilst it rises are the gravitational and the fluid resistance, which are both opposing the...
  5. J

    Quadratic drag — a baseball is thrown upwards

    Okay, I can understand that, not a problem (and probably fortunately).
  6. J

    Quadratic drag — a baseball is thrown upwards

    Homework Statement [/B] A baseball of mass m is thrown straight up with an initial velocity v0. Assuming that the air drag on the ball varies quadratically with speed (f = cv^2), show that the speed varies with height according to the equations. Where x_{0} is the highest point and k = c/m...
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