[Physics] Physics Digest, Vol 19, Issue 5

[carmam at tiscali.co.uk]

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



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.tuks.nl/pipermail/physics/attachments/20181128/cf4c5fc5/attachment.html>