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    Good ODE books

    Hey all, I was hoping someone would be able to point me at a good ordinary differential equations text. Basically right now I have been working out of 'ordinary differential equations" by boyce and brannon. but Im fed up with the book and really would just like a good book to be used as a...
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    ODE project please help

    Thanks for looking it over. Your right that is a much easier method. But in the second part of the question it states "show that when \gamma \geq 1 then the source must have an infinite lifetime. The way I took this is that if it is to have an infinite life then the \lim _{t...
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    Arithmetic question

    If M(x,y) is in terms of both x and y then I would say no, because you only have one equation and two unknowns
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    ODE project please help

    Im sorry, I posted this in the wrong section, feel free to move it to the homework section. Hey guys, Ive really been needing some help with this one. Im doing an assignment for Ordinary Differential Equations and I was hoping someone could help me out by looking over my work. Ive been...
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    Calculate (mu_s-mu_k)

    Right, and you know that mu_s and mu_k are related by the equation F(friction)=mu*(F(normal)) and because this is a frictionless, massless pulley we are able to relate the tensions of the two boxes.
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    Calculate (mu_s-mu_k)

    Draw a free body diagram for each box/crate to see where the forces are acting.
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    Password protecting a thumb drive

    Thanks, when I had googled a similar search nothing relevant came up but Ill use the search you used.
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    Password protecting a thumb drive

    Does anyone know if there is a way to password protect your thumb drive. Or any other kind of security that I could add to it.
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    Legal music file sharing program.

    Arent there a ton of places where you can pay one flat fee to download unlimited music? I think they only charge if you put it on a portable device, I cant remember the exact details though.
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    Which MP3 player?

    Yeah I checked it twice, it says 3200 for the bit rate. I doubt thats the number we are looking for though. But I know I did it higher than 64kbs
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    Which MP3 player?

    Im not entirely sure, how do you find that out? Heres what I tried anyway. I opened the player then clicked on a song and clicked properties. Then clicked details and it said bit rate was about 3200kbps for most of the songs I checked. But that number seems really high to me.
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    Which MP3 player?

    You should check out the sandisk sansa. I have a 4gb version and I'm happy with it. Its basically an Ipod mini for alot less money and it has alot of features like a voice recorder and radio. Ive used the recorder a couple of times in class and its pretty sensitive. You need to sit at the...
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    CPU with 91°C (195F)

    You should probably call their tech support because it sounds like something might not be working properly. Do you know if all the internal fans are running?
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    CPU with 91°C (195F)

    Hmm, well Im not really sure how you could change the temperature on a laptop. Are you using it on a soft material i.e. covering the exhaust vents like if it is being used on a bed?
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    CPU with 91°C (195F)

    Well firstly stop using that computer because at those temperatures you will wear out the motherboard or cpu really fast. In order to help you though we will need more information about your system. What cpu do you have and what model motherboard. Also list any other components in the case.
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    Finding minimum force

    They do give mu as .3. I think I might be able to solve the problem now. If I cant Ill post back. thanks for the help.
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    Finding minimum force

    That makes sense if the initial movement is vertical. But how could I find the tension if the initial movement is horizontal. Would'nt that bring us back to the 3 variable 2 equation thing? If it would help I could scan the problem from the book also.
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    Finding minimum force

    The problem Im having is that in all the figures (in the image) I have 3 variables with only 2 equations. In figure 3 The only way I could solve for the variables would be to set the normal force equal to the weight, however if the tension is also pulling up it would decrease the normal force...
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    Vector addition physics help

    The sum is the addition of the i, j, and k components of the vector. To find the magnitude of the sum you first need to add the components then find the magnitude of the resultant vector. i.e. take the square root of the sum of the squares.
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    Pros and Cons of getting an Iphone

    I actually got to use one the other day at the i store. I didnt care for it, but it was at least an interesting thing. The touchscreen is actually alot better then I had expected but I still had some trouble with hitting multiple letters on the keyboard.(I dont think it would be possible to...
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    Which alternative fuels do you support?

    A mixture of different energy sources would be the best solution. So as not to rely on only one thing.
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    Good pens?

    Ill try and remember that next time I buy pens, though it will probably be a while since I use pencils 90% of the time.
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    Good pens?

    Ive been using the bic atlantis pens and like them alot. They are pretty cheap too, which is always nice.
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    For Americans only

    Born Texas. Living in New Mexico
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    SIMPLE vector problem,, just making sure

    Yes it is solvable. You have 2 eqns and 2 unkowns.
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    Is this solvable

    Unless Im missing something I thought the half angle formula was \tan \frac{\theta}{2} = \frac{\sqrt {1-\cos \theta}}{\sqrt{ 1 + \cos \theta}} Thats not the same as \tan \frac{\theta}{2} = \frac{\sin \theta}{1 + \cos \theta} right? Or am I making a mistake?
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    Is this solvable

    Almost, but not quite. It looks pretty tough to put it in that particular form. The way I mentioned works so I guess Ill just stick with that, especially since remembering all those identities is a pain. Thanks for the suggestions though.
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    Is this solvable

    I think I found it. It came to me when I went to get the mail. :) basically I have this tan(30)=\frac {\sqrt {1 - \cos^{2} \theta}}{1+\cos(\theta)} From here I just put it in a quadratic form and solved.
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    Is this solvable

    tan(30)=(sin(theta))/(1+cos(theta)) The only way I can solve this is by using the graph on the calculator. There must be a way to solve it by hand though but I cant find it. Maybe Im just not thinking straight but its really getting to me.
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