R Kym Horsell wrote on 26/2/21 11:51 am:
palsing wrote:
On Wednesday, February 24, 2021 at 10:41:53 PM UTC-8, Daniel65 wrote:
wrote on 25/2/21 9:24 am:
All should note, that as speeds get anywhere near light speed,
kinetic energy goes to infinity.
That is, realistic speeds will be far, FAR less.
Gee Whiz!! Anybody that is a regular reader on this newsgroup would have
no doubt that YOU think speeds of anything like the speed of light could
never be reached!
But those of us who live IN THE REAL WORLD hope/believe otherwise!!
--
Daniel
Go to this page...
http://hyperphysics.phy-astr.gsu.edu...iv/ltrans.html
... and scroll down to the section called "Relativity Factor", where you find an online calculator where you can specify the rate of 'v' as a decimal of 'c'. Start with, for example, .99 and see what you get, then maybe (5) 9s then (10) 9s and finally use (1), meaning that v = c... and you will see that the answer is "infinity"... so NO, the smallest mass that you can imagine cannot attain a speed of c without requiring more energy than is contained in the entire known universe!

The universe AFAWK started from a point, is 14 bn years old
yet has a diameter nr 100 bn LY:

Yeap!! But easily explained if the Speed of Light used to be much faster
than it currently is!!

You know how things tend to slow down as they get older??
--
Daniel