Re: a few simple questions (from a layman)
- From: "Martin Hogbin" <goatREMOVETHIS123@xxxxxxxxxx>
- Date: Sun, 22 Jan 2006 22:53:46 +0000 (UTC)
"Mdmeenken" <mdmeenken@xxxxxxxxxx> wrote in message news:43d394ee$0$35287$dbd4d001@xxxxxxxxxxxxxxxxxx
>
> >
> > The best model we have for gravity is that given by
> > general relativity (GR). In GR gravity is due to the
> > curvature of spacetime. All freely floating (inertial)
> > bodies follow that curvature; the composition or
> > shape of a body makes no difference to its path
> > (worldline) through spacetime.
>
> hello Martin,
>
> I think my explanation to the OP is better, fi.:
It depends on the OP. In my view the more different angles
the better. Sometimes one particular explanation clicks.
> 1e , how do you know,that the OP knows what a world line is? he told you
> that he is a layman,you don't know what he knows or not.
I described it as a 'path through spacetime'.
>
> 2e , why should something follow a curvature or for that matter follow
> anything,
> why follow ?,why not stand still ,that has to be explained,with not to
> many words
> there is no force acting upon that something.
Good point. If the OP shows interest in my explanation
I will continued to explain that following a worldline is the
same as letting proper time pass.
One thing I have learnt over the years I have spent on
this group is not to fret too much about the quality of
an explanation initially. Sometimes the OP will prefer
another explanation, too often they will turn out to be
a complete crackpot.
> >> #2. Does Light always travel? I mean, well, does it ever stand still?
> >> And if it does stand still, what makes it start traveling again
> >> (assuming it was traveling before it stopped for a rest)? I'm basically
> >> familiar with the accepted notion that light has a speed limit. Along
> >> the lines of 186,000 miles per second, I believe. But does some light,
> >> say for example, travel in the slow lane? Clipping along at a pace of
> >> say, 12.5 miles per hour? And if so, why so? And if not, why not?
> >
> > Firstly, physics does not attempt to answer the question of why things
> > are the way that they are in any fundamental sense; that is a matter
> > for religion and philosophy.
>
> well, this is really poor,as I may say,,we do want answers,if we leave it to
> religion? ,well,
> we know where that goes,and philosophy, not much substantial is it?
It depends on what you mean by 'why'. If you mean why did
God/Nature/Chance (or whoever you think is running the show)
do things that way then that question is outside the scope of
physics.
> > Serious enquiries are always welcome here. Ignore the crackpots.
>
> not all are crackpots Martin,and lay people do not easy know one from the
> other.
It is not too hard to detect them with a bit of common sense and
a bit of research, like looking at a text book or two.
Martin Hogbin
.
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