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: Rotational Motion Speed at the top of the loop

  1. Oct 31, 2011 #1
    1. The problem statement, all variables and given/known data

    12. A motorcycle travels around a vertical 12 m radius loop. What is its speed at the top of the loop if the normal force exerted by the seat on the driver is equal to ¼ of his weight?

    a. 7 m/s

    b. 8.1 m/s

    *c. 9.4 m/s

    d. 15 m/s

    e. 88 m/s

    2. Relevant equations

    F=ma
    W=mg
    T=F-W
    a=v2/r

    3. The attempt at a solution

    I did (1/4)W=m(v2/r)-W and I got 12.1 m/s
     
  2. jcsd
  3. Oct 31, 2011 #2
    I get the same answer as you.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook