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!

Having a hard time

  1. Oct 5, 2008 #1
    1. The problem statement, all variables and given/known data

    A train traveling at a constant speed rounds a curve of radius 235 m. A chandelier suspended from the ceiling swings out to an angle of 17.5° throughout the turn. What is the speed of the train?

    2. Relevant equations

    a=v^2/r
    use of cosine and sine

    v=2x3.14xr/T

    3. The attempt at a solution

    Not sure what 17.5 degrees tells me about the problem, except its continuing along straight while the train turns. I tried to draw but it really doesn't make much sense to me. Also, even if I did compute using cosine and sine, what would that tell me about the problem except distance? And, I can't find acceleration, velocity, or period without time.
    Any thoughts?
     
    Last edited: Oct 5, 2008
  2. jcsd
  3. Oct 5, 2008 #2

    hage567

    User Avatar
    Homework Helper

    Consider the forces on the chandelier (draw a free body diagram). You will have the tension of the string, and gravity.
     
  4. Oct 6, 2008 #3
    I did that and I guess I can derive T from the triangle, but since T is a unit of time, I would have to cancel the time from both sides. Where is the unit of time in my free body diagram?
     
  5. Oct 6, 2008 #4
    Somebody please help I have to get this done by a deadline!!
     
  6. Oct 6, 2008 #5
    slkdfjklsdkfjjjj!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?