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: Circular Motion

  1. Sep 29, 2006 #1
    Hello again, tonite I am working on more homework and I am stuck on a problem involving circular motion. Here's the question:

    Q: A 24 kg child takes a ride on a fast Ferris wheel that rotates 4.5 times each minute and has a diameter of 19 m. (a) What is the centripetal acceleration of the child?

    Ok so I would start out by turning 4.5 rev/min into rad/sec:

    4.5 rev/min x [tex]\frac {1 min}{60 sec}[/tex] x [tex]\frac{2 \pi rad}{1 rev}[/tex] = [tex].3\pi \frac{rad}{sec}[/tex]

    Then R = 9.5m



    [tex]a_c[/tex] ended up being 8.44 m/s for me.

    Is there something I'm doing wrong?
  2. jcsd
  3. Sep 29, 2006 #2
    4.5 rev/min = 3pi/20 rad/sec
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook