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:

The radius of the observable universe is therefore estimated to be about
46.5 billion light-years and its diameter about 28.5 gigaparsecs (93 billion
light-years, or 8.8?1026 metres or 2.89?1027 feet), which equals 880
yottametres.
Age: 13.799?0.021 billion years
Diameter: 8.8?1026 m or 880 Ym (28.5 Gpc or ...
Density (of total energy): 9.9?10-27 kg/m3 ...
-- wiki

Moral: Never mindlessly apply formulas.