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from mrmackenzie
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
from mrmackenzie
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
from mrmackenzie
I’ve attached a set of notes to help with your revision for the Our Dynamic Universe resit on Tuesday. Remember that the resit paper will have knowledge questions only, so focus on the unit content during your revision rather than practising numerical problems. Thanks to Mr Noble for sharing his ODU notes.
from mrmackenzie
The cosmic microwave background radiation (CMB) is radiation left over from the big bang. When the universe was very young, just as space became transparent to light, electromagnetic energy would have propagated through space at a much shorter wavelength. Nowadays, the temperature of space has fallen to approximately 2.7 K (that’s 2.7 K above absolute zero!) … Read more
from mrmackenzie
Astronomers often refer to the colour of a star, which seems a bit odd because we mostly see stars as white twinkly objects. However, even with the naked eye, we can look closely at certain stars and detect a hint of colour – just look at this image of the Orion constellation. As we view … Read more
from mrmackenzie
We’re going over your drafts of the Outcome 1 report tomorrow.
For those who have mistakes in the raw data, a pdf version is attached below.
from mrmackenzie
Here are my worked answers to HW4 on forces. Please speak to me if you still have questions and working through the attached file.
Note that other methods are possible for Q5a(ii), e.g. sine & cosine rules, or a scale drawing.