Taking a guess based on background knowledge: assuming it is something like an iron nail, the material is already prone to "picking up" magnetism. By aligning it with the Earth's field, you are providing a weak magnetic order. By striking the bar, phonons propagate and allow a source for spin-flip interactions that allow the bar to pick up a weak ferromagnetic order, making itself magnetic.
Yeah, I dropped out of college and joined the military. Now I get like 74k/yr accounting for the benefits and all for doing almost nothing and I'm in charge of almost 24 other people. I command them to do busywork some other asshole told me to tell them to do.
>>7806112 i was an arrogant faggot and tried to get a physics degree as quickly as possible but realized i was being stupid too late and failed out. Now I'm studying information science and CS and am doing much better. It's probably not what you were looking for but I think my mistake can be valuable to learn from.
>>7806029 One theory is that there are multiple universes and you are only conscious and aware and 'alive' is because you are in the one universe where it's possible to be alive.
So in most other universes, we all got killed a million times over during the cold war. So reality seems more bizzare as it goes along 'I can't believe we actually survived all that historical shit!' it's because if we had not, you would not be conscious to observe it, so since you can only observe a reality... Comment too long. Click here to view the full text.
>eta In the way it's written, paying some heed to up/down indices, it's written as if you'd be working with a space equipped with a metric to move between the vector space and its dual. Briefly, it's used to raise/lower indices, but the upstairs/downstairs (contravariant, covariant, or mixed indices) Kronecker deltas are exactly the same anyway. >f, other indices out of nowhere If you're working in Einstein notation, which this is (please Google it if unfamiliar, it's pretty straightforward),... Comment too long. Click here to view the full text.
Specifically, eta usually means the Minkowski metric tensor.
>>7805995 Is you just want to learn this type of index stuff, go through a relativity course. Probably the best place to pick it up. http://theoreticalminimum.com/courses/special-relativity-and-electrodynamics/2012/spring
In principle, there's isn't one. But at a certain point, the medium propagating this sound wave I guess could be completely displaced and it would no longer really be a wave at all. That's sort of what happens in pic related, but the wall of air rushing at you (that hasn't been turned to plasma) is like a sonic boom and not really a sound wave. If you watch the old videos of nuclear tests, you'll notice that after the wind tears by, it all comes rushing back in because of the huge pressure differential. Again, not really a sound wave.
What's the evolutionary advantage to having large feet? I can't really think of what benefit it could possibly give other than maybe faster swimming or kicking things, but for that most kicks in martial arts are done with the shin rather than the foot.
If people in the past used to think the sun revolved around the earth, then what exactly was a year to them? Or did they know the earth spins on its own axis and adjusted the model movement of the sun to fit a year?
I'm simple minded, but given trigonometric definitions Sin Cosine Tangent of this pythagorean triple. How would I derive angle measures in degrees given the decimal/ fractions given Sine theta .80, Cosine theta .60 and Tangent 1.333 theta. of the top angle. Given it's a right triangle where the lines 4 and 3 meet. How do I transform this to get a degree part for the remaining angles using the trigonometric functions?
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