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  1. FizziksGuy's post in Fluids and projectile motion was marked as the answer   
    I would think the final pressure would be atmospheric...  🙂
  2. FizziksGuy's post in Motion in 2 Dimensions was marked as the answer   
    Hi GGirl,
         This looks like a great problem to break into separate components of horizontal (x) and vertical (y) motion.
  3. FizziksGuy's post in AP Physics C Kinematics Problem was marked as the answer   
    I have just the video for you...  we do exactly that in the Retarding and Drag Forces video.

  4. FizziksGuy's post in Homework in Bunches? was marked as the answer   
    Absolutely!  :-)
  5. FizziksGuy's post in Friction of a car was marked as the answer   
    Ahhh, likewise, I am not a fan of question 13 here (and only include it in the Regents Q&A book to give students an idea of what might come up).  The general strategy here... in #9 and #10 you find out how much force is required to meet the manufacturer's specs.  In #12, you find the maximum possible force friction can provide.  For #13, if the maximum force of friction from #12 is greater than the specification (#10), the manufacturer's claim is legit.  If the maximum force of friction from #12 is less than the net force required to meet the manufacturer's specs (#1), the manufacturer's claim is bogus.  Does that help?
  6. FizziksGuy's post in WA Dynamics question 9 was marked as the answer   
    Don't forget, in this problem there's also a force pushing the block up the incline.  So your equation to find FN would look more like:

  7. FizziksGuy's post in Physics C - Embarrassing WebAssign Question.. was marked as the answer   
    Here's a few hints...  try setting up a kinematic equation to describe the displacement of each of the rocks as a function of time, realizing that stone 2 starts a bit later than stone 1 (i.e. the time for stone 2 could be t-2s).  Then, you know that the displacement of the stones must be the same, so set displacement 1 equal to displacement 2, and solve for the time t.
    Does that help at all?
  8. FizziksGuy's post in Do we need to memorize Moment of Inertia equations? was marked as the answer   
    It's probably a good idea to know a few of the basic moments of inertia -- solid sphere, hollow sphere, rod about end, rod about middle.  You are expected to know how to derive moments of inertia, but "typically" in a more detailed problem they'll give you the moment of inertia -- but not always.
  9. FizziksGuy's post in Retarding and Drag Forces was marked as the answer   
    Thrilled to help, and welcome to the APlusPhtsics Community!

    The short version... The College Board says you need to know how to derive them. Very rarely have they asked students to do so, but it has happened...

    This guide sheet may help with studying: http://aplusphysics.com/courses/ap-c/tutorials/APC-Dynamics.pdf

    Good luck!
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