[Physics] Physics Digest, Vol 19, Issue 5

[Doug Marett]

Tom,

    "The past is gone, the future has not yet happened." - yes, nicely
stated!

Doug

On Wed, Nov 28, 2018 at 1:41 PM carmam at tiscali.co.uk <carmam at tiscali.co.uk>
wrote:

> Doug, You said "...since there is currently no known way for an observer
> to visit the past and prove that it co-exists." There is no known way,
> and never will be, so if you accept the caveat, that in itself proves that
> the past (future) doesn't co-exist. The past is gone, the future has not
> yet happened.
>
> Tom Hollings
>
>
>
> ----Original Message----
> From: dm88dm at gmail.com
> Date: 28/11/2018 18:17
> To: "General Physics and Natural Philosophy discussion list"<
> physics at tuks.nl>
> Subj: Re: [Physics] Physics Digest, Vol 19, Issue 5
>
> Hi Tufail,
>
>     Glad you liked the videos!
>
> To answer your questions, if the disk and magnet rotate in the opposite
> direction, the current direction reverses, so it would be negative. If the
> magnet and disk are reversed in position, the current direction remain the
> same if the magnetic field direction through the disk remains the same, if
> the magnet is flipped over, the current reverses. So in every case it obeys
> the left hand rule for electrons in the disk moving across a stationary
> magnetic field if you take the Maxwellian stance; current is generated via
> the Lorentz force.
>
> Yes, I think I follow on your other point - I am just trying to think of a
> better example - perhaps the relativistic idea that the past and future
> co-exist with the present is something impossible to test in principle,
> since there is currently no known way for an observer to visit the past and
> prove that it co-exists. I was thinking the other day about the
> implausibility of the space-time continuum and the big bang theory - if
> Einstein were right and the future and past co-exist, then immediately
> after the big bang, as soon as the arrow of time started, all places and
> events until the end of time would need to be conjured into existence all
> at once! The entire time-space continuum would need to suddenly "exist" ! I
> personally find this very hard to believe. : )
>
> Doug
>
>
>
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