Explain why the value of g is
zero at the centre of the earth.
......???
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Answers
Answer:
At the centre of Earth , the force due to upper half of the Earth will cancel the force due to lower half.Therefore, when F=0, then g has to be 0, Thus, the value of g is zero at the centre of the earth
Explanation:
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If there is no gravity in the centre of the earth then there is no real movement in any direction as it all cancels itself out, right? Without movement the only time you can assign is relative to movements which are being experienced elsewhere.
As such it experiences no time, since there on average is no directional movement.
This is something that is not particularly well understood, so I will attempt to explain my reasoning.
If an object does not move and there is no other object to relate it to then technically it experiences no time, because the only time you can assign to it will be arbitrary & meaningless and thus can be anything from zero to infinite without actually having any true value - implying that its true value is zero as it doesn't have an assignable time and zero is not a real value.
Although I personally have to disagree with the centre of the earth experiencing no time because although there is no gravity the earth is moving through space, which means this centre point is experiencing time as it is moving through space (since the earth is) and can be related to other objects moving through space.
(( Here on is personal philosophical interpretation and explanation relating to this question ))
What may be a more pertinent question to ask is whether there is an object in space which does not move at all in relation to the universe and whether the centre of this object experiences no time
Objects within the universe can only move in relation to others so if there was a non moving object at the very centre of the universe where every other object was either orbiting or moving away from it, the universe was still expanding in every direction without this object having any directional speed comparatively (basically an average of zero speed in any direction, the time at it's centre could be considered to be zero (so long as it was large enough or immobile enough to be unaffected by any other objects' gravities).
A problem that arises from this though is that this object would inherently have to move at the same speed as the whole universe to not be relatable in time or velocity to any other objects.
In my opinion this 'body' could not truly exist because it would be too massive to actually allow any other to escape it's gravity and as such nothing would exist outside of said object for any real time, but if this object had no time and no movement and nothing to relate it to, could we give it dimensions? And further to this would it really exist?
This object would instead have to be the universe, because on average it would experience no change in gravity and no change in time, we can't necessarily understand exactly how this works simply because we perceive time as a scale (seemingly one dimensional), but then we have likely been flung far from it's centre and can only perceive other objects relative to us, which are experiencing seemingly similar time periods to ourselves. It is well known that time experienced by certain bodies in space is very different in relation to others due to their mass.
The time we experience may not be the average the universe will ever experience, as we do not know what negative time is, just the same as we can only theorise about negative energy in the case of tachyons.
I believe that we are experiencing something we have come to call time, but that it moves in a direction in the same way that innumerable objects seem to move in through space in directions that are never truly negative.
The centre of the earth is on average experiencing less time than us, but I would not call it zero (not quite).