I need the square root of 2, 3, or 4. Thanks a bunch.
2007-08-27 08:55:37 · 5 answers · asked by Anonymous in Education & Reference ➔ Homework Help
For all of you trying to explain it to me, thanks but it was just a homework question. I'm not taking trig or anything like that. I'm a seventh grader who is in pre algebra. So thanks but don't worry about it.
2007-08-27 11:14:49 · update #1
the square root of:
2 is 1.414213562...
3 is 1.732050808...
4 is 2
2007-08-27 09:03:43 · answer #1 · answered by tuberk768 5 · 0⤊ 0⤋
Only one of those three numbers where the square root will come out an integer (whole number) is 4.
2 X 2 = 4
Both 2 and 3 come out to decimal approximations:
square root of 2 = 1.41421 carried out five places.
square root of 3 = 1.73205 carried out five places
Both are used a lot in electrical work. but usually only carried out to either 2 or 3 decimal places. Here are a couple of examples: For your information so you will know a lot of that number crunching does serve a useful function. Your math teachers aren't just being mean to you.
RMS or Root Mean Square is what your household voltage is rated in. So when you see 120 V's that means 120 VAC RMS. Not the peak voltage.
The square of 2 is used in figuring between RMS and peak voltage when dealing with AC current.
If you what to find out what the peak voltage your house hold voltage of 120 volts is you simply multiply by the square root of 2
120VAC X 1.414 (rounded off) = 169.7 volts Peak.
And if you have a peak voltage of 169.7 volts and you want to find the RMS voltage you divide by 1.414 to find the RMS voltage.
169.7/1.414= 120 VAC.
The square root of 3 is used when dealing with 3 phase electricty. Note most plants have 3 phase power coming into the plants.
Almost all AC motors in a plant are three phase. Where lighting is usually single phase.
The standard voltage in most plants is 440 VAC 3 phase or 460 VAC 3 phase or 480 VAC 3 phase.
You can find the single phase voltage by dividing (we'll use 480VAC) the three phase voltage by 1.73 (rounded off for convenience)
480/1.73 = 277 VAC. That means you will have to use lighting rated for 277 VAC's. not your standard 120 volt household lights.
2007-08-27 16:31:32 · answer #2 · answered by JUAN FRAN$$$ 7 · 0⤊ 0⤋
The square root of 4 is easy; =2
sq rt 2 ~1.41
sq rt 3~1.73
These come up very often, especially in trig, Memorize them.
2007-08-27 16:04:33 · answer #3 · answered by Anonymous · 0⤊ 0⤋
2 and 3 doesn't have a square root because there is no number that you can multiply it by itself to get to those numbers. The square root of 4 is 2.
2007-08-27 16:01:55 · answer #4 · answered by Roy 1 · 1⤊ 3⤋
1.41,1.73,2
2007-08-27 16:03:51 · answer #5 · answered by rakesh m 2 · 0⤊ 0⤋