1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Kinematics question

  1. Jul 27, 2005 #1
    Disc (R=5m) is rotating in horizontal plane (period T=10 s). Archer and target are located on the same diameter directly opposite each other (Distance between them equals 10m). Archer shoots. Bullets speed v=300m/s. I have to define angle alpha (approx) at which archer have to aim at target. We can assume that [tex]\omega R << v[/tex].
    I want to solve this in 1) inertial and 2) rotating frame.
    I did:
    [tex]d=\omega R t[/tex] (d is length of arc)
    [tex]\alpha =d/2R=\omega R/v=2\pi R/Tv[/tex]
    But the answer is [tex]4\pi R/Tv[/tex]
    What is wrong?
    And i don't know how to make it in rotating frame.
    I know that i have to take into account Koriolis and centripetal acceleration.
    Help me please make a step further. Thank you
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted