IF this is true ie if one form of energy chages to an another form so that no energy is lost , and the total energy remains constant … How did energy land up in the first place!!!
'scuse me?
When I saw this thread title I thought I might be able to contribute something. Instead I find myself a little more confused than before. Oh well.
The Big Bang got things going and we’ve been winding down ever since.
People have a bit of trouble with the BBT. 'Specially my HS Physics students. They all say, “Sure, at the big bang everything in the universe existed as a singularity, but what about .000000000001 second before it?”
There was nothing! Think of it like this: time started at the big bang. Since there is no such thing as negative time, there could be no “before” before it.
“In the beginning there was nothing, which exploded.” - Terry Pratchett
If time is logarithmic, then there is no negative time. If not, definition of time 0 is arbitrary. The Big Bang itself obliterates anything that may have come before it.
Imagine a previous universe with insufficient energy to expand forever that fell back in on itself to create the singularity that was the source of the Big Bang. It’s as easy to imagine that as it is to imagine a “nothing” that all of a sudden became everything.
I submit we simply cannot know whether or not there was a “before”.
it goes somewhat like this
at t=0 the entire matter and energy of the universe is assumed to be concentrated in about the size of an atom
when the big bang happened, the tremendous force pushed out this matter
at that time light travelled much faster than it does now
things have been slowing down since the bang
and they have been cooling down
hence the energy is converted to matter due to the cooling
Well not exactly. Inflation theory says that space expanded at a rate much greater than c and just carried everything in the universe along with it.
How is this even possible? From what I remember from high school physics and chemistry, that’s theoretically impossible. I can’t quote a specific law for you, but consider this:
You transfer a liter of water from container A to container B. Some of the water will stay in container A, so you lost water.
No, the “lost” water is still in container A, so the total water is the same. Even if you spill some on the ground, the total amount of water is still the same.
Another example is an electric motor, with 90% efficiency. You put 100 Joules in, and get 90 Joules of useful work. The other 10 Joules isn’t lost- it’s converted to heat. The total energy is constant.
Arjuna34