The Department of Physics. Part IA Natural Sciences Tripos 2013/14. Rotational Mechanics & Special Relativity. Lecture 1. Point your browser at: www-teach.phy.cam.ac.uk/teaching/handouts.php. Course materials. This space is for your own notes. Text-book references:
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Rotational Mechanics
& Special Relativity
We require that the total turning moment about C is zero, so we define its position to be such that m1l1 = m2l2. Since l1 = x0 – x1, and l2 = x2 – x0, we can write this as
where M = m1+m2.
G = rF
Rotational Mechanics
& Special Relativity
Rotational Mechanics
& Special Relativity
Rotational Mechanics
& Special Relativity
Rotational Mechanics
& Special Relativity
This was easily measured by Bradley, and appeared to show evidence for a stationary aether.
Now consider the path ABA:
Both AB and BA are across the wind. The light gets ‘blown’ to the right, so the path from A to B is slightly against the flow and takes longer.
Rotational Mechanics
& Special Relativity
Rotational Mechanics
& Special Relativity
Rotational Mechanics
& Special Relativity
sin( ) =cos()
as Bradley measured and used as evidence, incorrectly, of the existence of the Aether.
pulses in frame S:
Rotational Mechanics
& Special Relativity
Rotational Mechanics
& Special Relativity
Now transform into a frame travelling through the laboratory with speed vcos(θ):
Rotational Mechanics
& Special Relativity
I wish you a pleasant Easter break an atomic mass number larger than that of Fe generally releases energy, whilst the fission of nuclei lighter than Fe generally absorbs energy. Controlled nuclear fission is used in present-day atomic power stations to generate heat which is turned into steam to drive electricity generators. It may be possible in future to maintain the right conditions for nuclear fusion in a stable system so that electricity can be generated from water with the inert gas He as the by-product.