• ### Help With Calculus and Integration!?

So I'm fairly new to calculus, and integrals, and I'm working out an RLC circuit with this formula: http://latex.codecogs.com/gif.latex?V_{0}&space;cos(\omega&space;t)=RI+L\frac{dI_{L}}{dt}+\frac{1}{C}\int&space;Idt Where V0cos(ωt) is the AC voltage, ω is the angular velocity (2∏f), I is the total current, and L... show more
So I'm fairly new to calculus, and integrals, and I'm working out an RLC circuit with this formula: http://latex.codecogs.com/gif.latex?V_{0... Where V0cos(ωt) is the AC voltage, ω is the angular velocity (2∏f), I is the total current, and L R and C are the respective component values. * I know there are better ways to do this, finding voltages across the components and such, but this way intrigues me. And I don't understand it, and I'd like to. That equation looks all fine and all, so the next step is to simplify the integral. I must be missing something here, because when I simplified it I got: http://latex.codecogs.com/gif.latex?V_{0... * *Note: In the above schematics, ignore the subscript "L" under the I, it should be simply I. Where C0 is the capacitor value and C is the constant of integration. The answer in the book on the other hand, shows the answer as this: http://latex.codecogs.com/gif.latex?\ome... Things that are interesting to me is the extra ω in front and the new stuff being multiplied by R (I thought would still be I but now it's dI/dt). If anyone can bear with me through all this and help me understand what they did and why, I would be most thankful! Another note by the way, the book says this last function is a "linear second-order nonhomogeneous differential equation" which scares me... Thanks.
1 answer · Mathematics · 6 years ago
• ### How to calculate inductance?

In an attempt to learn more about inductance, here is my homemade problem: So, let's say I have a 120cm coil of 22 gauge magnet wire around a soft iron nail, that has a cross sectional area of 4cm^2, and a length of 90cm. How many turns of wire will I need to get an inductance of 0.005 Henrys? I've got a formula, it goes like this: L... show more
In an attempt to learn more about inductance, here is my homemade problem: So, let's say I have a 120cm coil of 22 gauge magnet wire around a soft iron nail, that has a cross sectional area of 4cm^2, and a length of 90cm. How many turns of wire will I need to get an inductance of 0.005 Henrys? I've got a formula, it goes like this: L = ((0.4*pi*N^2*u*A)/(l))x10^-8 pi is the 3.14159265358979, N is the number of turns in the coil, u is the permeability of the core material (air being equal to 1), A is the cross-sectional area of the core in centimeters squared, and l is the length of the core in cm! The 10^-8 is there because of some differences in measurement, and this is all measured in Henrys. The way I see it, I can calculate with that formula, but HERE'S MY BIG QUESTION: Does the gauge or type of wire I use around the core matter? Or just the number of turns? Can you answer my ultimate question with or without my formula? Much thanks.
1 answer · Engineering · 6 years ago
• ### Is this proper usage of futile?

"My broken arm is now futile, what a pity." I'm debating it, it seems like it's okay, but semantics could be wrong? I don't know, help me out?
"My broken arm is now futile, what a pity." I'm debating it, it seems like it's okay, but semantics could be wrong? I don't know, help me out?
1 answer · Words & Wordplay · 6 years ago
• ### Need help ASAP! SAT math question (practice)?

I need some help here, "If x and y are numbers such that (x+9)(x-9)=0 what is the smallest possible value of x^2 + y^2?" Answer: 81 Why is it not 162? I get as far as x=-9,y=9, as confirmed by wolfram alpha, but that can't be right if the total is 81?
I need some help here, "If x and y are numbers such that (x+9)(x-9)=0 what is the smallest possible value of x^2 + y^2?" Answer: 81 Why is it not 162? I get as far as x=-9,y=9, as confirmed by wolfram alpha, but that can't be right if the total is 81?
4 answers · Mathematics · 6 years ago
• ### Laptop charger tip getting hot after seconds of being plugged in?

I have a samsung notebook qx410 and ive had it for a good year and a half now. For that whole time I've had no difficulty with the charger, but today I plugged it in and smelled burning plastic almost immediately. I took it out and was actually burned by the TIP of the charger, the box was cool. I need to know if this is fixable or dangerous.... show more
I have a samsung notebook qx410 and ive had it for a good year and a half now. For that whole time I've had no difficulty with the charger, but today I plugged it in and smelled burning plastic almost immediately. I took it out and was actually burned by the TIP of the charger, the box was cool. I need to know if this is fixable or dangerous. Thanks in advance
2 answers · Laptops & Notebooks · 7 years ago
• ### Help with translating norwegian to english ASAP?

Get these words for me please! polet, polettn, reise(travel), slagord(slogans) overskrift, ingress ,tekst, type ,forfatter, foto, dato ,indexbilde ,bilde1 ,btekst1 ,bilde2, btekst2 ,bilde3 ,btekst3 ,bilde4, btekst4 ,bilde5 ,btekst5 ,pollist ,metatag navn ,epost There could be some slang in there, and I guessed on some,... show more
Get these words for me please! polet, polettn, reise(travel), slagord(slogans) overskrift, ingress ,tekst, type ,forfatter, foto, dato ,indexbilde ,bilde1 ,btekst1 ,bilde2, btekst2 ,bilde3 ,btekst3 ,bilde4, btekst4 ,bilde5 ,btekst5 ,pollist ,metatag navn ,epost There could be some slang in there, and I guessed on some, help please!! Thanks in advance :D
4 answers · Languages · 7 years ago
• ### Need someone Norwegian to translate ASAP please?

Here the info: artikkel(article),faq,forfatter(author),... book),kortnytt(thumbnail? summary?),leksikon(encyclopedias),linker... I made some guesses in parenthesis so check those and give me something please!!
Here the info: artikkel(article),faq,forfatter(author),... book),kortnytt(thumbnail? summary?),leksikon(encyclopedias),linker... I made some guesses in parenthesis so check those and give me something please!!
2 answers · Languages · 7 years ago
• ### How to tell if a number is whole in Java? HELP IMMEDIATLY?

I'm writing a program that will check every number from 1-1000 to see if its divisible by 3 or 5 and then add all those numbers together. The way I'm doing it is I'm seeing if the number is evenly divisible, inside a for loop, think of it like this. for(int i=1;i<=1000;i++){ if(i/3 || i/5 =a whole number){Add to the total of... show more
I'm writing a program that will check every number from 1-1000 to see if its divisible by 3 or 5 and then add all those numbers together. The way I'm doing it is I'm seeing if the number is evenly divisible, inside a for loop, think of it like this. for(int i=1;i<=1000;i++){ if(i/3 || i/5 =a whole number){Add to the total of numbers} } any help? Maybe another method? Help please.
3 answers · Programming & Design · 8 years ago
• ### Urgent! Help! Website Registered?!?

I have a website(dream-digger.com) and theres also a website called dreamdigger.com, who registered their name in 2009. I've been looking into the website, I email them, checked their hosting service, and I found some interesting things... First, their website has been "Coming Soon..." since 2009, there are no updates, and no... show more
I have a website(dream-digger.com) and theres also a website called dreamdigger.com, who registered their name in 2009. I've been looking into the website, I email them, checked their hosting service, and I found some interesting things... First, their website has been "Coming Soon..." since 2009, there are no updates, and no responses to my emails. Second, their hosting service? It isn't even up anymore, it's 4caboin.com or something. I try to go to it but I just get parse errors! So do you think that they would care if I used the name? Do they even exist anymore do you think? P.S. my website is currently down because of this issue, I took it down, but their website is still up, take a look. dreamdigger.com Help please!
1 answer · Technology · 8 years ago
• ### Good Band Name? DFHP?

So I have a band and we have gone through a couple names and settled on DFHP which is an insanely funny inside joke that we all know and love, but would you listen to band named DFHP? We play rock/alternative like green day, mcr, etc. So give some options, do you like it? What would be better? Even some of your own names that you think would be good.
So I have a band and we have gone through a couple names and settled on DFHP which is an insanely funny inside joke that we all know and love, but would you listen to band named DFHP? We play rock/alternative like green day, mcr, etc. So give some options, do you like it? What would be better? Even some of your own names that you think would be good.
4 answers · Rock and Pop · 8 years ago
• ### POLL: Website You Would Like To Have?

I'm thinking of writing a website but I have no ideas, so what do YOU guys wish you had. I'va already made one, www.dream-digger.com but I think it's offline now :(
I'm thinking of writing a website but I have no ideas, so what do YOU guys wish you had. I'va already made one, www.dream-digger.com but I think it's offline now :(
1 answer · Polls & Surveys · 8 years ago
• ### Technology/electronics study help?

Im looking into technology, inventing, etc. and I need a place to start. Like, should I start with microcontrollers? Or should I look into breadboard experiments? I have no idea where to start
Im looking into technology, inventing, etc. and I need a place to start. Like, should I start with microcontrollers? Or should I look into breadboard experiments? I have no idea where to start
2 answers · Engineering · 9 years ago
• ### How to move shortcuts and keep them there?

On my laptop, no matter how many times I move my icons, they always go back to the the same place on my laptop! How do I keep them where I move them?
On my laptop, no matter how many times I move my icons, they always go back to the the same place on my laptop! How do I keep them where I move them?
5 answers · Other - Computers · 9 years ago
• ### Why did "The Final Destination"'s effects suck donkey ***?

Watching this right now, why couldn't they just work harder on the FINAL MOVIE. The others were pretty good, and the acting was decent, but in the "Final Destination" all the effects sucked and the characters were kinda annoying. Thoughts?
Watching this right now, why couldn't they just work harder on the FINAL MOVIE. The others were pretty good, and the acting was decent, but in the "Final Destination" all the effects sucked and the characters were kinda annoying. Thoughts?
2 answers · Movies · 9 years ago