1. Not finding help here? Sign up for a free 30min 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!

Finding tension in string in vertical circle

  1. Oct 3, 2015 #1
    1. The problem statement, all variables and given/known data

    Your niece finds her father's watch. The light watch chain has a length of 48 cm, and the mass of the watch is 270 g. Your niece swings the watch in a vertical circle, maintaining the speed of the watch at 2.3 m/s. Find the tension in the chain when it makes an angle of 43° with respect to the vertical. (Assume the watch is closer to the top of the circle than the bottom. Also assume the radius of the circle is 48 cm.)

    2. Relevant equations

    Fnet = ma
    a = v^2/r

    3. The attempt at a solution
    [itex]Fnet = ma = T + Wcos(43)[/itex]
    [itex]0.270(2.3^2 /0.48) = T + 0.270*9.8*cos(43)[/itex]
    [itex]T = 1.04 N [/itex]

    This answer is incorrect. Can someone explain why?
     
  2. jcsd
  3. Oct 3, 2015 #2
    Closer to the top than the bottom. Add or subtract?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Finding tension in string in vertical circle
Loading...