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

Hi, mikaelaq23!

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Thanks!

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)

Hi, Unknown008!

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

Do you know anything about vector forces, please?

Thanks!

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 :)

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!

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! :)

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!

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. :)

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!

That's all right Clough! :) Take your time :)

It will happen, Jerry! Just need to know the right words to use! Subject is not what I normally discuss with anyone. But, I feel that I do need to know something about it, since one of things that I do for a living is to re-build pianos.

Thanks!