# How to find tension in a wire.

A traffic light of mass m (= 18 kg) hangs above the street by two wires, both of which make an angle (= 65 deg) with the vertical.

1. How much is the tension in each wire?
2. Find the tension for = 0 deg

 Clough Posts: 27,302, Reputation: 8524 Uber Member #2 Sep 21, 2009, 12:51 AM
Hi, mikaelaq23!

This isn't a site where people just plug in their homework questions and get the answers. If that happened here, how would that be helping the students to learn?

If you show what work you've already done concerning coming up with answers yourself, someone very knowledgeable will be more likely to come along and discuss with you how and why your answers are correct or incorrect.

Ask Me Help Desk - Announcements in Forum : Homework Help

Thanks!
 Unknown008 Posts: 8,147, Reputation: 3745 Uber Member #3 Sep 21, 2009, 08:37 AM
1. Have a sketch.
2. From that, you should see that both wires endure the same tension.
3. Remember that if the system is not moving, that means that the resultant forces are zero?
4. The downward force is 180 N, there must be an upward force equal to that. (taking acceleration due to gravity to be 10m/s^2)
5. That upward force (vertical component) is shared equally between the two wires.
6. Use your trigonometry to find the tension in the wire (the tension is the hypotenuse of the wire with the horizontal component and vertical component as the other sides)
 Clough Posts: 27,302, Reputation: 8524 Uber Member #4 Sep 21, 2009, 01:25 PM
Hi, Unknown008!

I hope that mikaelaq23 returns to get your help in figuring this out!

Thanks!
 Unknown008 Posts: 8,147, Reputation: 3745 Uber Member #5 Sep 22, 2009, 07:01 AM
Well, I must say I know some of the principles, but I don't think that I master the thing yet. I can clearly see this through the posts here and there where ebaines or other members have to correct me. I've got a lot to learn still
 Clough Posts: 27,302, Reputation: 8524 Uber Member #6 Sep 22, 2009, 04:31 PM
But, do you know just the basics about vector forces, Unknown008?

I'm just a beginner with that sort of thing and I feel that I need to know something about them for what I do concerning piano technology.

Thanks!
 Unknown008 Posts: 8,147, Reputation: 3745 Uber Member #7 Sep 23, 2009, 08:34 AM
Well, ok, I know the basics. A drawing can always make a problem easier in vector forces.

As a side note, I would love to be able to play the piano with my two hands, fast and precise notes like the great pianists!
 Clough Posts: 27,302, Reputation: 8524 Uber Member #8 Sep 23, 2009, 12:17 PM
So, if I started another thread, would you be able to explain to me about vector forces as related to the strings in a piano?

I can coach you on this site about piano playing! I'm going to be soloing on piano in October with one of our groups here that is composed mainly of professional teachers and musicians. It's like the local symphony, except that it's a concert band.

Thanks!
 Unknown008 Posts: 8,147, Reputation: 3745 Uber Member #9 Sep 23, 2009, 12:19 PM
Hey! That sounds like fun Clough! Ok, Go for it then! I'll do my best about the vector forces!

Just pm me the link. Wait, I need to go now. It's late in here and I have to wake up early tomorrow. You can start the thread, I'll be there tomorrow.
 Clough Posts: 27,302, Reputation: 8524 Uber Member #10 Sep 23, 2009, 12:43 PM
Hi again, Jerry!

It's going to take me a bit to figure out what I'm going to ask and how I'm going to ask it on the thread. So, it might be a day or two before I get it going...

I will let you know about it, though!

Thanks!

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