Troubleshooting — 319 discussions

Hello - I worked out this problem but I got a wrong answer. First, I used the Pythagorean theorem to find the radial distance between A and each charges. So 1.2m divided by 2 (= 0.6), then the square root of .6 squared + .6 squared = .849, which is the radius. Then I used Coulomb's...

I had to make a galvanic cell for my chemistry class and it was supposed to have a voltage of 2.3 but for some reason it only was .5. My cell was comprised of a iron and aluminim electrode with the respective nitrates.( potassium nitrate salt bridge) it was wondering if anybody knew why it would...

Ok, I have a stupid question on pauli matrices here but it is bugging me. In a book I'm reading it gives the equation [\sigma_i , \sigma_j] = 2 I \epsilon_{i,j,k} \sigma_k , I understand how it works and everything but I do have a question, when you have k=i/j and i!=j (like 2,1,2) you get a...

My system is not booting up and in very first stage ,,it is givng the error... L9999999999999999999999999999999999999999999 and it doesn't g any further... and also it doesn't detect the IDE master and slave... what possibly can be wong with it??

Hi, I'm working on a students marks evaluation webpage, unfortunately i run into several problems and i need some help fixing it :smile: <%@ Page Language="C#" %> <script runat="server"> void submit(object sender, System.EventArgs e) { lblMessage1.Text = TextBox1.Text...

Find an equation of the curve that satisfies dy/dx = 88yx^(10) and whose y intercept is 4 dy/y = 88x^(10)dx integral both sides ln(y) = 8x^(11) y = e^(8x^(11))+C put x = 0 into the equation I got C = 3. Why am I wrong?

I have a circuit problem. There is a 30 V power source conected in series with a switch and a ten ohm resistor. The circuit then spling to an inductor of 10 mH and a 20 ohm resistor. I am having difficulty finding the current across the 20 ohm resistor. I got the current immediately after the...

I continue to have troubles with my residential DSL service. Occasionally (on the order of every half hour or more), my service will just stop working for a minute or so. (Gee, that doesn't sound like a big deal, but really, it makes me want to toss my computer out the window). I'd like to...

Tex will not work here for some reason

Okay, I am messing something up here. I think it's my logic. Given k=2.5 * 10^3 N/m Find how much mass would have to be suspended from the vertical spring to move it 6.0 cm I get W=1/2kx^2=.5(2500)*(.06m)^2=4.5J I think that's right. Then I do W=F*d=m*a*d or...

Hello everyone, I seem to be getting all the mirrors right that where concave but now i have a convex one and it doesn't seem to be working when im' finding the image distance and magnification/properties. Here is the problem: Heres my work: both the i and the m where wrong, i also tried...

I just bought a sata drive for my computer and i connected everthing. i am trying to install windows on this drive. the drive is detected and everything but windows installation does not detect it and as a result the installation process is cancelled. i even turned off the primary ide interface...

Sorry if this is not the right place to post this, but as of late I have been unable to see a lot of latex, all I see is "please wait while...is loading". It never loads.

I have an acer aspire30002 and i connected a dell flat panel monitor to it. The thing is I can never get them to display separate screens. I got them to display the same thing earlier but now only one at a time. Does this mean that the video card does not support dual monitors?

As you know wi-fi is a radio signal and I'm wondering if physics can help me by determining why is my internet acting weird on me. I know about waves and nodes and antinodes and I'm wondering does wi-fi have these properties and how can i position it. In a geological perspective its distance...

Hoping at least one person will know anything about Targus, specifically their wireless laser mouse (P# AMW15US). It says you can use it with Mac, but mine doesn't even detect the USB receiver, though the device lights up. I read one review...

My father's computer is exhibiting weird behavior. It seems not to like certain websites (for example apple.com, mcafee.com). When one tries to load one, it times out and IE displays it's page for a DNS error. What makes it worse, is a few days ago it suddenly fixed itself only to go back to...

I am trying to open a .tex file. When I clicked on it, it asked what program I wanted to use to open the thing. So I selected wordpad. The thing opened up in wordpad with a blank document. When I selected print preview, it allowed me to scroll through 4 blank pages. Here' s the...

I have a small problem with my lan. The setup is as followed: The cable modem is connect to a hub, which is connected with my own pc. I used to have an older machine [win2k, normal network card] which had no problems connecting to the network and to the modem. About one week ago I got myself a...

I need to write a function that takes an input string and returns it minus all vowels and another that returns it with each vowel duplicated. ie - in the first case, removeVowels("Zippy") would return "Zppy" and in the second case duplicateVowels("Zippy") would return "Ziippy". I know it is...

I'm trying to create an area mep for an image, but it's not working right. any help? <html> <head> <title>Enter through the door</title> </head> <body> <map name="amap"> <area shape="rect" coords="474,202,541,358" href="../leveltwo.htm"> </map> <center><img...

Why won't this work? :frown: ---------------------------------------- import javax.swing.JOptionPane ; public class FinalBalanceCalculator { public static void main(String args[]) { String input; String name; double b0; double rc; double ty; double ans; input...

What's wrong with this C++ project I'm working on? it's supposed to find the area of a circle: #include <cstdlib> #include <iostream> using namespace std; int main(int argc, char *argv[]) { int pi = 3.14 int rad int radsqr = rad*rad count << "radius of the circle:"...

I have a question about album art in windows xp. A lot of my music was taken from backup disks and didn't come with album art, they were burnt under windows me. I've went ahead and searched a P2P network for album art and retrieved most of what I need. The problem I am having is that quite a few...

Every time I compile and run a program in Dev-C++ Command prompt only opens for less than a second and closes immediately. can anyone help?

I'm trying to reinstall windows, but on reboot I can't start from the particular CD-rom (other CD-roms do work on reboot, but I need this one). It says: Boot CD-ROM type: Non-Emulation Booting Press a key if you want to start up your computer from cd-rom... and then it hangs, the cd-rom...

I downloaded Morphix which was supposed to give me an idea of Linux. I downloaded an iso file. Then I had a virtual drive so I mounted it on that. I used Nero and burnt all the files to a rewritable cd. When I restart the pc (with the CD inside) I get "Boot from CD: " it stays there for 10...

I am trying to reformat my hdd when something weird happened. I have a P4 desktop and I wanted to reinstall everything on there. So I booted from the windows CD and it formatted and installed windows XP sp1... when the computer restarted, it said that some file was missing and it wouldn't start...

It probably is my isp actually, some sites have acted very strange lately. Note: I am using firefox 1.0.4. What I am trying to do is press the button/s to close some sections. These buttons, in this picture: http://img193.echo.cx/img193/6460/pfprob6er.png But I am just being...

I bought a webcam Wednesday, and now I can't get into the software to use the webcam, although I could get in the previous two days. I ran a virus scan, and the scan identified a file: C:\Documents and Settings\Family\Application...

Just having trouble again with a few questions. 1.Calcium oxide (lime) is a white crystalline solid with a melting point of 2572c. It is manufactured by heating limestone, coral, sea shells or chalk, which are mainly CaCO3, to drive off carbon dioxide, according to the following reaction...

Anyone who has problem in signing up in Hotmail account? I can't check my mails!

Circuit Help! Help! I am trying to design thsi circuit for some friends, however, having the 2 light bulbs in the circuit seem to "eat" all of the power, cuasing the laser to be VERY dim. Isn't there an electronic component taht i can jump across the light bulbs that will allow them to stay...

I'm trying to build this simple lie detector (picture below). I'm 90% sure that i have it built correct on my breadboard, but for some reason my LEDS are getting destroyed if i try applying the full 9V. It takes around 3V to make the LEDS to turn on about halfway. For some reason, there is a lot...

Hi! I connect 9 volts to a 1 ohm resistor and thought I would get I = U/R = 9 A. But when I connect the ampmeter, I cannot read anything! Where is the problem?

I used the formula (E * Area * cos(theta)) and got the wrong answer (.02529) and I really don't understand why. I need help The square surface shown measures 4.0 mm on each side. It is immersed in a uniform electric field with magnitude E = 1930 N/C. The field lines make an angle of 35° with...

hi all, i did a dissambley of a torque driver, and when i put it back, i could not get the click sound when i tried to calibrated the wrench.. any idea wat is wrong? regards, ss

I'm having trouble with the following VHDL code: library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_ARITH.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; entity circuit is port (a, b, c: in std_logic; f1, f2, f3, f4, f5, f6: out std_logic); end circuit; architecture...

Anyone know enough about TI-83s to help me out? For some reason whenever I try to graph a polar equation on mine it gives me what the graph should look like for radians when degrees is the mode of choice and vice versa. For example, if I were to graph sin(theta) I get a nice pretty circle when...

Multimers :(( I have been trying this thing for past 2-3 weeks with no luck :(( :cry: I am trying to make a multimer from an oligo. This is how i did: - Annealed the oligos - Phosphorylated the sample (5' ends) - ligated o/n when i ran it on agarose it shows only a dimer. what...

I can't seem to obtain the right answer using the escape velocity formula. I think my problem is with the gravitational constant. I would like to find the escape velocity of the sun. v_e=\sqrt{\frac{2GM}{r}} or v_e=\sqrt{\frac{2\mu}{r}} v_e_\odot=617.54(km/s)...

Hello, I'm new here, and I need help with a problem. I'm sure there is a really easy answer to this, but I don't know what it is. I can't find it googling, probably because it is so obvious to everyone else. But I have a circuit, which requires multiple batteries to opperate. Too combine their...

I've got an assignment for a class in which I'm supposed to make an assignment statements parser using Lex and Yacc...well, actually variants called Flex and Bison. I am having major problems getting this to work. It will recognize one token or character and then give a "parse error". I...

This is another problem I am having troubles with. Here's the prompt: What is the reading of a voltmeter with the proper range and with resistance 5*10^4 Ohms when connected between point b and ground? I know that for voltmeters, V = I_fs (R_c + R_s), and I tried solving for V using the...

can someone please help me with this problem? After emptying her lungs, a person inhales 4.5 L of air at -3.5°C and holds her breath. How much does the volume of the air increase as it warms to her body temperature of 37°C? i used the equation \displaystyle{\frac{V}{T}} =...

Again, my rusty algebra and derivative taking is getting me into trouble. This is from the section on alternating series. Overall, I think I'm getting the concepts, but some of the solutions to the problems are leaving me scratching my head. \sum \frac{(-1)^{n+1}(n+1)}{ln(n+1)} How did...

i have the answer to this problem i just see why I'm not getting the same answer as my solution manuel. i Have two functtions f(x) = x and g(x) = tan(x) and i have to find where these two functions are equal using Newtons method. i subtracted the two functions to get this new function H(x) =...

Im trying to define a function in a MATLAB m-file. function y = f(x) global T; f = 1/(x^5*(exp(h*c/(k*x*T))-1)); but it doesn't work...matlab says ? Input argument 'x' is undefined. Error in ==> D:\Program\matlab\work\f.m On line 6 ==> y = 1/(x^5*(exp(h*c/(k*x*T))-1)); Error...

I'm doing the following problem, it seems to me that I am doing all the correct steps but my answer differs from the answer key, am I missing something? 1. What is the magnitude and the direction of the electric field at a point midway in between a -8.0uC and a +6.0uC change 4cm apart...

I have been trying to install Matlab all year and i keep running into the same problem. When i try to install Matlab i do not get any error messages, but when i try to start it up, it says "initializing" for about 30 seconds then the program just shuts down. I do not know if i am having a...