Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Am i going about this angular acceleration question the right way?

  1. Nov 25, 2008 #1

    livblue23

    User Avatar

    1. The problem statement, all variables and given/known data
    A 0.023 g 1.0 inch long second hand on a wristwatch. Find its average angular acceleration?


    2. Relevant equations
    av=w/t


    3. The attempt at a solution

    so would i just do 0.023 g divided by 1 minute?
     
    livblue23, Nov 25, 2008
  2. jcsd
    Phys.org - latest science and technology news stories on Phys.org
  3. Nov 25, 2008 #2

    Pythagorean

    User Avatar
    Gold Member

    this is an oddly phrased question.

    If the second hand goes around smoothly, it won't have any acceleration just a constant velocity.

    If it's one of those watches that delivers an impulse every second then the hand would move 1/60th of 360 degrees every second. In this case you could use the angular version of the distance equation and solve for a, but you'd have to consider that the second hand goes from 0 to some alpha, then from that alpha back to zero (starting and stopping).

    note: (alpha is angular acceleration)
     
    Last edited: Nov 25, 2008
    Pythagorean, Nov 25, 2008
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook