Recent content by DrZoidberg

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    Storage of material from CD's and DVD's: cloud?

    CDs can store about 700 MB, DVDs 4.7 GB. So with 1000 discs you are looking at somewhere between 0.7 and 4.7 TB. Google Drive charges $10 per TB and month. But you have to upload everything there. Uploading just 1 TB at e.g. 10 MBit/s takes 12 days if your PC runs continuously. That would mean...
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    Need a machine to impart measurable charge (Coulombs) at will

    1000 nC can't be correct. At 1.5V the capacity would have to be 666 nF. In reality however it is around 20pF. Are you sure that all parts of the experiment - including the capacitor and the coulombmeter - were completely discharged before you did your measurement? Also, all plastic objects...
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    Crossword Puzzle Generation Algorithm

    Why gotos? What language are you using? I don't see a really efficient way of doing this. I would just use simple recursive backtracking algorithm. https://en.wikipedia.org/wiki/Backtracking
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    B How Long will my battery Last?

    You'd be surprised how much current even a small lithium ion battery can output. Take a look at this video that shows the insides of a small lithium jump starter and what happens when you short it out.
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    Java How to design chrome logo programatically?

    I made up a few equations that seem to approximate Googles logo and typed them into Wolframalpha. https://www.wolframalpha.com/input/?i=x^2+y^2=0.8^2,+x^2+y^2=1,+x^2+++y^2+=+2.2^2,+y=1,+y+=+sin(120)/cos(120)+*+x+-+sin(90)/sin(30),++y+=+sin(240)/cos(240)+*+x+-+sin(90)/sin(30) It seems to work...
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    How to distinguish the decimal expansions of irrational numbers from random numbers?

    A truly random natural process could produce any arbitrary sequence of digits. So no matter which irrational number you pick, if you select x digits from that number they could by pure coincidence look exactly the same as some subsequence of the digits produced by said natural process. And the...
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    Electric field inside a conductor

    Let's look at the generalized form of Ohm's law J=σE. (Current density = conductivity * electric field strength) This means that E must always be equal to J/σ. So if the current is zero the field must also be zero. That tells us that in a static situation - i.e. there may be charges but no...
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    Magnetic Field of an AA Battery 'Immersed' in a Conductor

    Look at Spinnor's drawing. The field strength approaches zero if the loop is very large. Otherwise it's non zero.
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    Why is the electric field in an ideal wire zero?

    That's only the case if there is more than one resistor in the circuit. Otherwise the field strength won't change if the value of the resistor is changed as long as it's physical dimensions stay the same. This is easier to imagine if you think of water flowing through pipes. If there are two...
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    Magnetic Field of an AA Battery 'Immersed' in a Conductor

    If the whole arrangement is perfectly symmetric the magnetic field would also have to be symmetric around the battery. But according to maxwell's equations - more specifically Ampère's circuital law - that field needs to be zero here since the total electric current enclosed by the magnetic loop...
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    Saltwater Generator: Harnessing Electricity from Salt Water

    That's not a real article, that's an ad. Someone should replace it with actually useful information.
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    C/C++ Java vs wxWidgets or GTK+ with c++ for a PC ground station

    You could use pretty much any programming language you want for that. In which way is processing not powerful enough? And what kind of apps do you want to write?
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    Will there ever be a new CPU manufacturer?

    There is a Sentence in the text you quoted that I find particularly interesting. While the x86 CPU market is not a real monopoly it seems to me that that sentence partially applies here. CPUs are a vitally needed resource. A huge number of people and companies are dependend on those CPUs. The...
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    Will there ever be a new CPU manufacturer?

    Are you asking me here what the downsides of a monopoly are? Well, this article about US antitrust law for example mentions many important points. But you could also look at this summary of the biggest problems. Interestingly that site also shows that there can be exceptions where monopolies are...
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    Will there ever be a new CPU manufacturer?

    Exactly. And as I said, once this leads to a large monopoly on the market it poses a serious problem.
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