Q:A street lamp weighs 200 N. It is supported by two wires that form an angle of 130° with each other. The tensions in the wires are equal.What is the tension in each wire supporting the street lamp?If the angle between the wires supporting the street lamp is reduced to 100°, what is the tension in each wire?

Problem 1: If the tension in the two wires are equal, the angle they make with the horizontal must also be equal. Always remember that a horizontal line is a straight angle; hence, it has a measurement of 180°. Let's look for the angle the wires make with the horizontal. 130 + x + x = 180 130 + 2x = 180 2x = 180 - 130 2x = 50 (Divide both sides by 2) x = 25° Each wire makes a 25° angle with the horizontal. We can now find the tension. The mass must be divided by 2. Using trigonometry, let's find the tension force. The divided weight of the lamp shall be the opposite side, and the tension force shall be the hypotenuse. sin 25° = (200 / 2) / Ftens Ftens = 100 / sin 25° Ftens = 236.62 N (Answer) The tension is 236.62 N in each wire. Problem 2: We use the same approach. 100 + x + x = 180 100 + 2x = 180 2x = 180 - 100 2x = 80 (Divide both sides by 2) x = 40° Each wire makes a 40° angle with the horizontal. Calculate the tension force. sin 40° = (200 / 2) / Ftens Ftens = 100 / sin 40° Ftens = 155.57 N (Answer) The tension is 155.57 N in each wire. Hope this helps!

Q:I just learned how to do 3-way wiring, so that I can turn a light off from 2 different switches. My question is, how do I add another light to that mix, so that both lights come on/go off at the same time when I turn the switches on and off? (It's for a closet that has 2 lights in it that I want to come on/go off at the same time).

Very basically, you must have two wires going from light to light. A black wire and a white wire.( A bare copper wire should be included with the pair. It is a ground wire and grounds both light boxes together.) Back to the black and white wires. The black wire should be connected to the black switch leg wire at the first light box as well as to the first light fixture. The white wire is the neutral and should be connected to the white wire of both light fixtures. That's called a parallel connection. Just a note: There are several ways to wire three way switches, so my answer presumes there are two wires going from one of the switches directly to the light fixture. (A white wire and a black wire).

Q:If you hang a pot-plant with mass of 8kg from two lengths of wire attached to a horizontal beam 100cm apart. The wire on the left has a length of 50cm and the wire on the right has a length of 75cm.What is the tension in both wires?

The tension in both wires.? If you hang a pot-plant with mass of 8kg from two lengths of wire attached to a horizontal beam 100cm apart. The wire on the left has a length of 50cm and the wire on the right has a length of 75cm. What is the tension in both wires? In the triangle ABC, AB(c) = 100 cm, BC (a) = 50 cm and AC (b) = 75 cm 2s = a+b+c = 225 cm s = 112.5 s-a = 112.5 - 50 = 62.5 s-b = 112.5 - 75 = 37.5 s-c = 112.5 - 100 = 12.5 tan A/2 = √ {(s-b)*(s-c) / [s*(s-a)] = √ {37.5*12.5) / [112.5*62.5] A = 28.95? tan B/2 = √ {(s-c)*(s-a) / [s*(s-b)] = √ {12.5*62.5) / [112.5*37.5] B = 46.57? C = 180-28.95-46.57 =104.48? --------------------------------------... 46.57? is the angle between horizontal and 50 cm wire. 28.95 is he angle between horizontal and 100 cm P is the tension in the 50 cm wire and Q is the tension in the 75 cm wire Equating the horizontal components of the tensions P cos 46.57? = Q cos 28.95 ? P = Q cos 28.95 ?/ cos 46.57? P = 1.27 Q-------------------1 Equating the sum of the vertical components of the tensions to the weight of the pot P sin 46.57? + Q sin 28.95 = 8*9.8 N 0.73P + 0.48 Q = 78.4N 0.73(1.27 Q) + 0.48 Q = 78.4N Q = 55.72 N and P = 70.76 N ============================= Or use Lamis theorm Angle between P and Q = 104.48? Angle between P and the pot = 90 + 46.57? Angle between Q and the pot = 90 + 28.95 By Lamis theorm P/ cos 46.57? = 78.4/ sin 104.48? P = 55.67 N and Q = (78.4/ sin 104.48? ) cos28.95 = 70.85N ====================================

Q:i have 4 wires going to a ac unit #10 wires 2 wires for each cir. and i need to know how many amps can I run with 2 #10 copper for one side of the breaker

10 wire is rated for a maximum of 30 amps. This size wire can not be run in parallel to carry more current. I suggest that you have a local qualified professional electrician do the work since you seem unsure about what you are asking.

Q:I have a 3 wire source I want to connect it to a switch on/off and then make it 2 wire to the light

A three wire source generally means hot (white or red), neutral (black) and ground (green). If that's the case, eliminate the ground wire. It's not as safe, but will let you hook up using the hot and nuetral wires.

Q:What happens when you hook these 2 wires up right along each other?

if you have an rca tv which works with 12 volts.......if the wires not connected to battery...there no problem. if connected to battery....the fuse blows.(close to battery on wire)....if there is no fuse....wires burn...risk of fire....do not forget...every device works with car battery MUST and MUST be eouipped fuse .

Q:I have a very old house. I was unhooking the fluorescent light in our kitchen to put a round ceiling light in and the old fluorescent light was plugged into the ceiling (like any regular two pronged electrical plug). How do I wire the ground wire, the line voltage wire, and the neutral wire from the new light so I can plug it into the plug in my ceiling?

Undersized connector blocks are a particularly user-friendly situation. As you found out, the offered block replaced into ok for an ordinary connection, yet rubbish for greater complicated wiring. Wickes, Wilkinsons, BQ sell strips of connectors for a pair of quid.15amp blocks would be the appropriate suited style of length for 4 wires.

Q:which color is the positive and negative wires on the speakers of a 1993 F-150 one is red and one is black..

door speaker wires 150

Q:i need a definition for wire bending for my art project.

Bending wires in order to form frames for mattress and box-spring assemblies.

Q:When it is time to replace wiring in a building?

Should your power needs increase, you can add additional circuits without having to replace the existing ones. Typically you'll need to replace wiring if it has become damaged or is otherwise worn out. Wires may be damaged due to a variety of reasons. Rodents are notorious for chewing on exposed wires in attics and other crawl spaces. Construction and re-modeling may damage wires. Wires can also wear out due to age or extreme conditions of heat or cold. Very old wires used before the 1960s made use of rubber and fabric for their insulation. These materials would degrade over time, resulting in shorts and arcing, which poses a fire hazard. These wires should be replaced - at a minimum, they should be protected with an arc-fault interrupter circuit protector. There is some debate that older copper wire contains too much oxygen, which can cause issues, but this is not conclusive yet. In some cases, you might need to replace older wire in order to make use of modern appliances. For example, very old homes might utilize 3-wire 240 volt circuits. Modern 240 volt appliances, like your kitchen stove, cannot use this wire - they require a type of cable with 4 wires.