Recent content by jellyman

  1. J

    Finding the speed of an approaching object using the doppler effect and sonar

    Homework Statement I attatched 2 images, the problem, and my work (including the formula needed)This "double shift" is what's getting me. Is it going 2% towards the object, and 2% from it? Or I'm I suppose to use 2 functions:F'=(f+xf) and F'=(f+yf) where x + y = 0.04? Homework Equations See...
  2. J

    What is the period of a book swinging like a pendulum?

    I|| = \frac{1}{12}Mdcom2 + Mdcom2 This doesn't make sense though because it leaves me with an M on the top in the equation for T.EDIT: I asked somewhere else and they used T = 2π√[L/g] and got .83 seconds. This doesn't sound quite right. It's too easy this way!
  3. J

    What is the period of a book swinging like a pendulum?

    Oh. Then that leaves me with I= M(a2 + b2)/12. That gave me a period of .476 second which has been marked wrong.
  4. J

    What is the period of a book swinging like a pendulum?

    1. In the figure below, a book is suspended at one corner so that it can swing like a pendulum parallel to its plane. The edge lengths along the book face are 28 cm and 19 cm. If the angle through which it swings is only a few degrees, what is the period of the motion? 2. I=(ML^2)/12...