# Homework Help: Having a hard time

1. Oct 5, 2008

### sugarntwiligh

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. Oct 5, 2008

### hage567

Consider the forces on the chandelier (draw a free body diagram). You will have the tension of the string, and gravity.

3. Oct 6, 2008

### sugarntwiligh

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?

4. Oct 6, 2008