What is the relativity theory about?
What are black holes?
Where is the limit of life? What defines that something IS alive? Molecules are alive? If not, how can a cell, that is made of molecules, be alive?
If everything is energy, why can't I transform myself into, say, a table?
How will the universe end?
How did the Universe begin?
What was there BEFORE the Big Bang? Can we even ask ourselves that question?
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Theory of special relativity:
This theory states that the speed of light is constant. That means, it will travel at that speed, regardless of where the observer is. For example, if someone on the Earth watches a folder, he will affirm it is still. Yet, if someone in a space ship in space sees the same folder, he will say that it is moving, because the Earth moves too.
With light, this is different. If a train goes at 6m p/sec, and someone throws a ball out of the window at 0.05 m p/sec that ball will travel at 6.05m p/sec. But if that person turns on a flashlight, the light won’t travel at 300.000.006 km p/sec, it will travel at 300.000.000m p/sec, because nothing can vary the speed of light.
All other speeds are RELATIVE, that means, they vary depending on where the observer is.
In this theory, a very known equation is stated. It’s the following:
E=mc2
In this equation, “E” means energy, “M” stands for matter, and “C” for the speed of light, that’s means, 300000km p/sec. The speed of light is always 300000km p/sec, C2 will always be exactly the same. That is called a constant. That means, the higher “E” is, the higher “M” is. They are proportional.
Now, here is the problem. Naturally, the higher the speed, the higher the energy requirement. A man running fast will need more energy than one walking. So, “E” grows when things go faster. So, “m” grows too! That means, the faster someone goes, the bigger he is. But, the more mass he has, the more energy needed for him to move (e.g.: an obese man and a skinny man). But, because he needs more energy, he has more mass. And more mass means more energy. And more energy means more mass. This is called a vicious circle.
When someone rides a bike, or even a plane, the matter change is practically null. To get to the speed of light, the energy needed is so high, that it is infinite. If energy is infinite, so is mass. So, traveling at the speed of light is impossible.
I wont talk about general relativy... is too hard and advanced -.-"
Where is the limit of life? What defines that something IS alive? Molecules are alive? If not, how can a cell, that is made of molecules, be alive?
Limit of life? Guess so... when a phenoma occurs where everything actually shifts out of existence or blows up, then life would indeed stop, but once again, life may start, just liked it started after the bing bang. Nothing is actually sure.
Something is alive when it complies with the 6 or 7 things... MERRING i think... movement, respiration, excretion, growth, nutrition, irritation and something with R (i forgot)
A molecule isnt alive because it doesn't comply with the stuff stated above. A cell is alive because different molecules are arranged in such a way that they do comply with these 7 conditions. It's actually hard to explain it.. some people would beleive this is a miracle, or just a coincidence.
What are black holes?
A black hole is a very dense piece of matter. It is so dense, that gravitation attracts light, to the point that light is absorved, that is why it is black. A star needs to transform Hydrogen into helium to live. When it runs out of hydrogen, violent reactions occur. First it dilates, and rings of gas are created around it. Then comes the Red Gigant. After the Red Gigant, 3 things can happen. If the star is small, it turns into a White Dwarf. If it is bigger, intoa pulsar, a very dense star. If it is even bigger, into a black hole.
Anyways, black holes have a singularity in the middle, this is where all matter is concentrated. It also has an event horizon; it is called this because anything that crosses that point never comes back, including light. The faster the b hole spins, he less the radius of the event horizon. There is a theory that states that if the angular momentum is such that the event horizon shifts out of existence, a naked singularity will be left... but its just a theory.
If everything is energy, why can't I transform myself into, say, a table?
Who said you couldnt? By using the concept of weak nuclear force, atoms can change into others when they emit alpha radiation. True; this process would require a LOT of work, because the human body must first be separated into pure hydrogen, pure carbon, pure oxygen etc, then the atoms that aren't a part of wood must be turned into them. Then all the atoms must be combined into molecules of wood, and then somehow ask a friend to shape you into a table. It's hard, but it isn't "impossible".
How will the universe end?
What do you mean with "universe"? for example, if the theory that states that all the energy will be equally distributed, because that is the nature of the universe (for example, if all matter and anti-matter mutually annhiliated and only radiation was left,) the universe would still exist, would it? Yes, a very boring universe, but it would still be a universe.
If the big Crunch took place, and the whole universe crunched and left everything in a single spot, the universe would be still there. And what is on the other side of the boundary we call the universe's "limit"?
How did the Universe begin?
What was there BEFORE the Big Bang? Can we even ask ourselves that question?
It's practically impossible to know what happened before the big bang, because everything literally blew up. A lot of years studying astrology would show us an idea of how matter separated, but we could NEVER know what happened before it. So once again, it's impossible to know how the universe actually started.
No ofense on people who beleive in arbitrary beings (i dont.)
Other interesting questions:
What's Time?
What's Space?
What's Time-Space?
I guess General Relativity would clearly be out of the scope of 7th formers :) interestingly though, most of this questions were asked by one of them.
JOJO i think the first one that posted was Mr. Sturla :P
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