# Sensei

Senior Members

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13

1. ## Solar panels, why they are a bad investment

I calculated long time ago that for all my needs (~330 kWh per month) I would need 18 m^2 of solar panels. It includes night time and slightly winter. Is 18 m^2 a lot or not? 18 m^2 is 14 panels that have 1600x800 mm (1.28 m^2), 15% effectiveness (160 W/m^2) Each of them costs here $303, so total solar panels installation is$4242. It's cost of 64 months (5 years 4 months) power station bills (with inflation less). Costs of batteries and inverter not able to estimate. But inverter I could build by myself. Roof above my room has exactly 5x4 m = 20 m^2.. If installation would work 50 years, and I would have to pay in advance for 6 years, isn't 12% of power station bills? And 88% saved? With inflation (at least increase 5-10% prices of electric bills per year now), it'll be much much better investment..
2. ## Java Programming Code

When we will replace 'b' by b (secondary apostrophes) Compileonline.com is showing following error: "Compiling the source code.... \$javac FirstProgram.java 2>&1 FirstProgram.java:7: error: illegal character: \96 a = b; ^ FirstProgram.java:7: error: illegal character: \96 a = b; ^ FirstProgram.java:7: error: not a statement a = b; ^ 3 errors " Is it what you see.. ?
3. ## Prime Numbers in Binary

It works the same way as in any other system.. Binary, decimal, hexadecimal etc, are just visualization method. Number remain the same. You're mixing up definition of digit, with definition of number.. That's correct that in binary you have just 0 and 1 digits, and in decimal are only 0...9 and in hexadecimal are 0...9, A-F (10-15). Your example 29 ALSO exceeds 10 digit boundary of decimal system nearly 3 times! In binary example: %110 is not prime because it's dividable by %10 and by %11. Any prime number in binary system must end up with %1 (except %10) it's equivalent of ending with 1,3,5,7,9 in decimal. But that's not the only condition! I can also write fraction using binary, see: %111.1011 It means: 1*2^2+ 1*2^1+ 1*2^0+ 1*2^-1+ 0*2^-2+ 1*2^-3+ 1*2^-4= 7.6875
4. ## Java Programming Code

character is single letter f.e. 'x' string is class, internal array of dynamically allocated chars, and you initialize it by f.e. "test". http://docs.oracle.com/javase/tutorial/java/data/characters.html Shouldn't here be public static void main(String[] args) ? Try also this, whether it compiles fine: public class FirstProgram { public static void main(String[] args) { char a, b; a = 'b'; b = 'c'; a = b; } } Remember that there are two apostrophes keys that looks very similar.. ! One you have below ESC key, on right of 1 digit key. Second one you have on left of ENTER key. You should use proper one.
5. ## WHAT CAUSE CURVE-LINED MOVEMENT OF QUANTA?

But you were talking about charged particles too: "the electron performed circular spherical trajectories with a figure like a deformed clew of thread. Indeed, this was a model. But the idea that electron in atom performs circular spherical trajectories, is something (I think) contradictory with “statement that electron is wave”." Electron is charged particle..
6. ## WHAT CAUSE CURVE-LINED MOVEMENT OF QUANTA?

Do you mean something like this, from Cloud Chamber & Bubble Chamber x-ray photos? It's result of presence of magnetic field (magnet or electro magnet) below particle detector chamber. It's used to reveal charge, mass and momentum of particle. Positively charged particles are "curling" in reverse direction than negative, and neutral don't curl at all. And it's additionally restricting volume it's traveling (long trace could optionally exceed chamber otherwise). If you would follow my suggestions to build your own Cloud Chamber, you would see these traces on your own eyes.. ps. If you would strip middle of post, this question could be as well asked in mainstream part of this forum... Can't you constrain yourself to just asking questions about things you want to learn.. ?
7. ## Where has the north pole gone?

Do you realize that below North Pole there is no land? It's melting and freezing every year. The question is only - how much of its area is melting and how much of area is freezing back. You can see North Pole web cams here http://www.arctic.noaa.gov/gallery_np.html These cameras are drifting. Path they traveled is on first picture on the right. Animation made of photos took in couple months:
8. ## Tests of Divisibility- Simple tricks

2,4,8,10 cases can be much easier: We use binary and operator to get rid of upper part of value, and check remaining by comparing it with 0: if( ( value & 0x1 ) == 0 ) // dividable by 2 if( ( value & 0x3 ) == 0 ) // dividable by 4 if( ( value & 0x7 ) == 0 ) // dividable by 8 (this can be extended to any 2^x) Value is dividable by 10, if modulo 10 is returning 0: if( ( value % 10 ) == 0 ) // dividable by 10 if( ( value % 100 ) == 0 ) // dividable by 100 if( ( value % 1000 ) == 0 ) // dividable by 1000
9. ## Who are the unknown living thinkers in physics?

Content of stars were known even in XIX century because of spectroscopy.. http://en.wikipedia.org/wiki/History_of_spectroscopy
10. ## Quantum Field Theory unable to explain null magnetic moment of even-even nuclei with Z=N

Surprisingly, Andrea Rossi answers are very mainstream.. According to http://arxiv.org/abs/physics/0608229 there was used electric arc 5 J (they did not tell in description what current and what voltage, perhaps U>800,000 V with very small current I=6.25*10^-6 A.. ?) To create single neutron from proton and electron there is needed 0.782+ MeV energy, which is 1.252764E-013 Joules. 5 J is billions time more energy than needed for single neutron creation. I read somewhere on the net that after analyze of used neon lighting tube there has been found unexpected isotopes in it (they emit light because of electric arc passing through noble gas ionizing it)
11. ## Clean energy and waste management

f.e. - make all containers for food with bail, so majority of them won't end up in trash, but producer who made them (and knows exactly what is it made of). - recommend using glass for containers (so it'll simplify reusing). - make public transport ticket free, so people will leave car at home and use bus/train. One bus is equal to 1 km of two passes road full of cars. Calculate fuel burned by them.. - entirely switch to using solar panels. Government could create public company with the only aim- invent efficient, produce and install solar panels on roofs or walls of the all citizen homes for free. Unlike private companies, public company don't need to make money by selling goods.
12. ## Disproving Darwin

Not to mention bacterias and viruses...
13. ## Equating motion with energy

Mechanism for Brownian motion is conservation of energy and momentum.. Every single day gases in atmosphere are heated by photons, accelerated, then giving their kinetic energy to surrounding them gas particles, then to solids and liquids on the ground. And energy is spread across all particles. If Sun photons would stop arriving to Earth, all gas would freeze, and you would no longer have Brownian motion.
14. ## On the Subject of gravity in general... split

Hawking radiation is hypothetical. You shouldn't talk about it as something verified and confirmed.
15. ## What methods are used to determine how much of climate change is man-made?

Are you kidding? Temperature change graph in the last 1000 years is not enough? http://en.wikipedia.org/wiki/Temperature_record_of_the_past_1000_years To calculate past temperature before invention of thermometer there are used f.e. tree rings . Read article. http://en.wikipedia.org/wiki/Dendroclimatology

If you would have f.e. array overflow on stack or structure, you would be reading wrong values in data prior, or after field that has overflow. f.e. struct X { float data1; char data2[ 10 ]; float data3; }; X x; x.data2[ -1 ] = 123; // array entry at index -1 is in reality data1 x.data2[ 10 ] = 456; // array entry at index 10 is in reality data3 It happens more often than you think- typically index to array is dynamic, not static like in example above. So there might happen some bug causing reading/writing from negative index, and reading/writing wrong value from/to wrong place.
17. ## Discussion split from "Impossible engine works?"

That's completely not needed to anything.. Aether is XIX century hypothetical medium through which light propagates.. After finding out light is particle, you don't need medium anymore. Medium was needed for waves, by analogy- wave of sound needs air (typically), wave on water needs water etc. So XIX century physicists were applying this analogy also to light. That's a good explanation and answer but I cannot think of any mechanism in particular to explain how this could work since microwaves are readily absorbed if not reflected. See Shawyer engine - it's cone. Bottom of cone has PI*r^2 area, while the rest has much higher area (and the sharper cone, the higher area). For length = 4m, radius = 1m, you will have areas like on below picture: If ratio of photons that are absorbed/reflected is always the same, cone will absorb much more photons than its bottom.
18. ## Discussion split from "Impossible engine works?"

This is kinda silly. Is microwave photon creating aether? Is there infinite amount of aether, so it can flow outside of device forever? Is aether particle, so it can escape some system? "low pressure of aether, high pressure of aether" this sounds like aether is kind of particle that is pressing on some area, and occupying some volume.. Then why not simplify it and say that some microwave photons escape system, while other one are absorbed by engine.. ? You're contradicting your own model... If aether is readily flowing through regular matter, how can there be "lower pressure of aether, or higher pressure of aether"... ?
19. ## Sound

Even different length, size and shapes of the same material are giving different sound...
20. ## College Costs

Good that we have free Internet where you can learn everything.. Worser will be when every web page will be paid.

Nonsensical, completely irrational, and IMHO illegal tax. Against the main rule of justice: "there is no crime, if there is no victims" (which is violated in just modern centuries XX-XXI on mass scale). Even worse: paid before any hypothetical violation really had place. Like you would have tax for cars, added to its price in the shop, just in case it'll be used in accident and perhaps blindside pedestrian... ps. We have such here also.. List of countries, and tax amount (not complete AFAICS) http://en.wikipedia.org/wiki/Private_copying_levy tax 36 euros for digital video recorder?! tax 18 euros for hard disk?!
22. ## Photoelectric Effect

Because it's particle. Are you aware that we can create electron and positron pair from single photon that has energy > 1.022 MeV? y -> e- + e+ Typically photon has to hit some nucleus to produce pair. The higher energy of photon can produce other pairs of particles. Photons with extreme energies are creating shower of new particles. http://en.wikipedia.org/wiki/Ultra-high-energy_gamma_ray Photoelectric effect is just one of many effects confirming particle nature of light. Photon-atom interactions video:
23. ## Thermodynamics First Law

In this thread I showed how to measure gravitational acceleration, at home doing experiment: http://www.scienceforums.net/topic/84336-if-pi-ratio-was-squared-and-98-mss-how-would-this-change-the-whole-of-science/?p=815752
24. ## Impossible engine works?

This is critique of Guido Fetta's engine, not Roger Shawyer engine..
25. ## Kramer on energy (hijacked from "What exactly is energy?")

If you don't know how scientists are checking what is charge of particle we see, or its mass, you should ask such questions in the mainstream physics part of this forum, and you will get answer.
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