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Homework Help: Motion in a Circle

  1. Jun 9, 2014 #1
    1. The problem statement, all variables and given/known data
    A small mass M attached to a string slides in a circle (x) on a frictionless horizontal table, with the force F providing the necessary tension (see figure). The force is then increased slowly and then maintained constant when M travels around in circle (y). The radius of circle (x) is twice the radius of circle (y).
    1) M's kinetic energy at y is four times that at x.
    2) M's angular momentum at x is .... that at y.
    3) M's angular velocity at x is one quarter that at y.
    4) As M moves from x to y, the work done by F is .... 0.
    5) While going from x to y, there is no torque on M
    Each has the options of True/False/Less than/Greater than/Equal to

    2. The attempt at a solution
    1) False
    2) Greater than
    3) False
    4) False
    5) True

    Attached Files:

  2. jcsd
  3. Jun 9, 2014 #2
    Hey, I just saw your other post too. So, same as that one, could you first explain your reasoning for each answer? It helps a lot in seeing if you got the problem right.
  4. Jun 9, 2014 #3
    Nevermind!!! I was able to get this one as well. My answer turned out to be
    1) true
    2) equal to
    3) true
    4) greater than
    5) true
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