http://mimesisprime.rightsidedown.com/homework.jpg(adsbygoogle = window.adsbygoogle || []).push({});

I'm having trouble with this problem...I need to figure out the tension in the top rope (the horizontal one). The diagonal bar is 7.5m long and weighs 8kg, and the thing that's supposed to be a stoplight is 12kg.

So far, I have to figure out the vertical and horizontal components of the hinge (A) and the tension of the rope. I've figured out 2 of the three equations, the ones for forces in the X and in the Y. I can't figure out the torque ones though...Assuming that we choose point A as the pivot point, what's the equation? I know you have a torque coming from the bar, (3.75*8kg*g), a torque from the stoplight (12kg*7.5m*9.8), but I don't what's countering that. The answers are: tension = 2.5 x 10^2, horizontal is 2.5 x 10^2, and verticle is 2.0 x 10^2.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Tension in ropes problem

**Physics Forums | Science Articles, Homework Help, Discussion**