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FAQ

Please help, I'm stuck on this problem:An aluminum wire and a steel wire, each of length 4m, are hung from the ceiling. A 7 kg mass is suspended from the lower end of each wire. The aluminum wire has a diameter of 1.1 mm. What must be the diameter of the steel wire if it is to stretch the same distance as the aluminum wire, so that the two wires maintain equal lengths after masses are attached? Young's modulus for aluminum is .70 x 10^11 Pa and for steel it is 2.0 x 10^11 Pa.

The cross-sectional area of the steel wire must be (.70 x 10^11 / 2.0 x 10^11) of the aluminum wire. So the area of the Al wire is pi*(0.55mm)^2 = 9.50331778 × 10^-7 m^2 The area of the Steel wire must be 3.32616122 × 10^-7 m^2 now solve for the radius of the steel wire. A = pi*r^2 - r = 0.32538 mm d = 2*r = 0.65077 mm

We bought a used 2004 Chevy Venture that is a cargo style van... it only had a radio in it. So we just bought a Sony car stereo with a cd player to install in it. However, we are having trouble locating the correct wiring harness for the 2004 Venture. We've bought two already for GM vehicles that should technically work for the year of our van, but they do not work. One salesman told us we needed a very expensive wiring harness because it controls the airbags and other electrical gadgets (but they didn't sell it at his store... he said to look online). I've looked online and can't find anything. Would we be better hardwiring it OR does anyone have any experience with a situation like this? Thanks!

did you try walmart? for a direct fit in the radio section,, also face plates for the dash. they have harness to connect from your car to the radio. you also can try the parts store..

what do i do? the wire just snapped.

If the wire is broken but still attached to your brackets and it isn't moving you could put a piece of wax or gum over where the sharp part is to prevent you from catching your cheeks or lips on it. If it's too loose and about to fall out then try gently sliding the wire out from under the bands around the brackets (only if you really have to). Make an appointment to your orthodontist as soon as they can get you in because that isn't fun to have to put up with. Please don't chew on anything hard like candy or it might make the weakened bracket pop off which might make for a longer appointment. Stick with soft foods 'till you can get it fixed. I had them for 4 years! Now I work in a dental office. Just take it easy, don't worry too much. :)

Does anyone know what color the amp sensor wire is on a 2005 EX?

some amp's have an auto power on when they receive a signal through the input speaker wires. that would give them a power and ground wire only.

Suppose we have a 10v battery.one end of the battery is at 10V electric potential and other is at 0V Hence,the potential difference is 10V.if we measure the voltage( p.d.) across positive terminal at 10V and the middle of the wire connecting both ends of battery will it be less??I mean,at the middle of the wire the electric will not be zero,right??(correct me if am wrong)Thanks!!

You are right.

During a lab experiment, a straight piece of copper wire is connected across the terminals of an AC generator and the current through the wire was measured. If the wire is removed and a part of it is tightly wound into a loop of many coils and the wire is then reconnected to the generator, will the measured current through the wire be greater, lesser, or the same as it was before the wire was coiled? Explain your answer.

Assuming the generator output voltage (RMS) remains constant the current will be less through the coil. By wrapping the wire into a coil it's resistance doesn't change but it's self inductance increases. AC in a wire produces an alternating (changing) magnetic field that is concentrated into a smaller space as a coil - so increasing it's strength and ability to link with the wire that produced it. When this changing magnetic field links (passes through) it's 'own' coils a self-induced 'back' EMF(voltage) is generated in the wire that opposes the 'forward' current from the generator (Lenz's law). If the geverator provides a pd = Vg and the back EMF = Vb, then the current in the coil is effectively being driven by a reduced pd = (Vg - Vb) .

What are the types of Barbed wires?

depends upon which type of animal you wish to keep in the pen comes in many types and twists - each one different for the job that needs done some of the twists/patterns are for individual farmers - like a signature, its theirs alone - identifies their property lines - that doesn't include razortina wire - that is a whole different thing the tatoo stuff is made up - like a comic book, not real patterns google it for more details too many to type here

I removed my old door chime/bell a few years ago and replaced it with a wireless one. That one quit working and now I am attempting to install a new wired one again. The only problem is, when I removed my old one way back, I failed to label the existing wires to where they go. I have two wires coming out of my wall mount, one white, one brown and the both have a white and red wire sticking out of them. I am not sure which one/ones will connect to the FRONT and TRANS posts on my new chime. I don't have a rear door bell button so that is not a problem. Which wire goes to the FRONT and TRANS and do I cap off any of the 4 wires? My installation instructions don't cover the mindless mistake of not having the wires labled.

one wire is coming from the door bell and on is going to a transformer, all you have to do is make it into a series circuit, connect the two red wires together from each cable take one white wire and hook to trans on the door bell and the other to the front. if you want to check this out you need a meter set it for AC under 100v check each set of wires for 12-24v red to white at each cable the one that dosent have power is going to the button at the door while button is pushed check this wire for continuity if this all checks about than wire as i described above