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Homework Help: [Solved] Calculating gravitational potential energy

  1. Sep 26, 2008 #1
    Hi guys. I have this homework question that I've been working on and I cannot even figure out where to start. Here goes:


    A 1.80-g particle is released from rest at point A on the inside of a smooth hemispherical bowl of radius R = 25.0 cm (figure below).
    p5-65.gif

    Calculate the following:

    (a) Its gravitational potential energy at A relative to B.


    (b) Its kinetic energy at B.


    (c) Its speed at B.


    (d) Its potential energy at C relative to B.


    (e) Its kinetic energy at C.

    So far, I've only been able to calculate (d). I know what I have to do to calculate (a), and I know that (a) and (b) are equal since the bowl is smooth and frictionless.

    Here's my problem with (a). I know that PEg=mgy, but I can't figure out how to calculate y. I know it must be something blatantly obvious, but I've been doing physics all day now and I can't even think straight anymore.
    I don't need answers; I just need some help figuring out how to get y in (a).

    Thanks

    EDIT
    I just figured out a through d
    Mods please delete thread. I got it.
     
    Last edited: Sep 26, 2008
  2. jcsd
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