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profile for orion on Stack Exchange, a network of free, community-driven Q&A sites


Sep
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Aug
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comment Where does gravity get its energy from?
By era of energy I meant, the initial time of universe when everything was energy. Matter was not formed at this time.
Aug
25
comment Where does gravity get its energy from?
@udiboy. Are you saying that gravity existed during the era of energy, that is, when universe was just filled with photons?
Aug
25
comment Where does gravity get its energy from?
I don't know from where does the energy of explosion (Big bang) came.
Aug
25
comment Where does gravity get its energy from?
As per my understanding, "Big bang" happened and our universe (known) came into existence. Everything in the beginning was in form for energy, i.e. photons. At certain point of time energy got converted to matter and gravity came into existence. When gravity came to existence the gravitational energy or potential came into existence, since then it is converting to other forms and vice versa.
Aug
25
comment What causes electron to orbit the nucleus in an atom?
Quantum physical rules does not allow it to fall inside nucleus and hence it starts orbiting around it. When it started orbiting in the nth orbit, it had the angular momentum $n\hbar$. It keeps on orbiting due to conservation of angular momentum.
Aug
25
comment What causes electron to orbit the nucleus in an atom?
Consider this, an electron that is away from the positive nucleus (i.e. which is not part of the atom) gets attracted toward it due to electrostatics force.
Aug
25
comment Where does gravity get its energy from?
When you place another object in this region, its gravitational potential will be different at different distance from the first object. Hence, by virtue of the position of the second object relative to the first object, it will have different energy.
Aug
25
comment Where does gravity get its energy from?
Ok, got your point. Let me try a different approach. I am assuming that you understand what is space-time. Space-time is three dimensional and difficult to image, but for sake of understanding our problem, we can assume it as two dimensional. So, in this regard, every object in such space-time will modify and create a region of depression. Now, if you specify a number for every point in the region around the object (which we will call gravitational potential) then this number varies as you move away or near the object.
Aug
25
comment What causes electron to orbit the nucleus in an atom?
Hi Aparajita, please specify your doubt? What do you believe? Electrodynamics is a field, do you mean electrostatics coulomb force? If yes, then you are right, it is electrostatics coulomb force that provides necessary centripetal force to electron for circling around the nucleus.
Aug
25
answered Where does gravity get its energy from?
Aug
15
comment Can light exist without spacetime?
Its a difficult question as I can't imagine "something" without space and time.
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