Tag Archives: our dynamic universe

introducing special relativity…⤴

from @ fizzics

We’ve been looking at Einstein’s special theory of relativity this week.  Special relativity is tricky get get your head round.  Let’s start with a video about the speed of light. We watched this video in class, it follows Einstein’s thought process as he worked through his special theory of relativity. special relativity from mr mackenzie on ... Read more

H tension HW answers⤴

from @ fizzics

I’ve marked your HW jotters and will hand them back during tomorrow’s lesson. I’ll go over the main issues in class but many of you need to review the way you attempt tension questions; use a free body diagram and only use F=ma when you know the resultant force.  These two videos should help. HW ... Read more

Hubble discovers our universe is expanding⤴

from @ fizzics

In the 1920s, Edwin Hubble had access to the Hooker telescope on Mount Wilson, Los Angeles.  This was the largest telescope in the world at that time.  His first breakthrough was the discovery of a cepheid variable star in the Andromeda nebula.  This enabled him to calculate the distance to Andromeda and he quickly realised this was ... Read more

redshift⤴

from @ fizzics

more redshift   and Yoker Uni’s video about Doppler and stuff   While redshift can be used to tell us about the recession velocity of (non relativistic) galaxies, we also need to find a way to measure the distance to these galaxies.  Astronomers have two main methods to measure these distances; parallax (more parallax here) and cepheid ... Read more

special relativity⤴

from @ fizzics

Special relativity is tricky get get your head round.  Let’s start with a video about the speed of light. This video follows Einstein’s thought process as he worked through his special theory of relativity. special relativity from mr mackenzie on Vimeo. time dilation A Tale of Two Twins from Oliver Luo on Vimeo. another take on ... Read more