Why Does E=mc2_ - Brian Cox [98]
absolute
relativity of
Space travel
Spacetime
and causality
curved
and distance
flat. See also Minkowski spacetime
as four dimensional
Minkowski spacetime
Spacetime diagrams
Spacetime momentum vector (energy-momentum four-vector)
Spacetime velocity vector
Spatial coordinates
Spectroscopy
Speed, through spacetime
Speed limit, cosmic . See also Speed of light
Speed of light
and relativity
Square root
Standard Model of Particle Physics
architects of
formula
and gravity
and symmetry
tests
Standing still
Stanford, California
Stars
evolution of
neutron stars pulsars
white dwarfs
Static electricity
Steam, age of
Stellar evolution
Straight lines, and curved spacetime
Strong nuclear force
Subatomic particles
Subjectivity
Subtle is the Lord (Pais)
Sun
gravitational pull
position in the galaxy
Super-Kamiokande experiment
Swiss Federal Institute of Technology (ETH)
Symmetry
gauge symmetry
Symmetry of equations
Syrup analogy
Tau neutrino
Tectonic plates
Telescopes
Television sets
Tevatron
Thales of Miletus
Theories, testable
Theory of everything
Thompson, Benjamin (Count Rumford of Bavaria)
Thought experiments
Three-dimensional
Three-dimensional momentum
Tides, ocean
Time
absolute
as fourth dimension
relativity of
Time dilation
Time travel
Titanic (ocean liner)
Translational invariance
Twins Paradox
Unified theory
Universal speed limit . See also Speed of light
Universe, early
University of Manchester
University of Zürich
Uranium
Vectors
four-dimensional
spacetime velocity vector
three-dimensional
Velocities, small
W particles
Wandering stars
Warping of spacetime
Watt, James
Wave equations
Weak nuclear force and electromagnetism
Weight, and mass
Weinberg, Steven
White dwarfs
Wigner, Eugene
Wilberforce, William
William of Occam
Wilson, Edward O.
Wind energy
X-rays
Yang, Chen Ning
YouTube
Z particles
Zero mass
Zircon dating
1 There have been many attempts, since Michelson and Morley, to detect the ether and all have yielded null results.
2 A nanosecond is one thousandth of a microsecond, or 0.000000001 seconds.
3 The sealed box is just to stop us from being distracted by the idea that we could look out of the window of the train to determine whether we are moving. Of course that is irrelevant; looking out of the window only ascertains that we are moving relative to the ground outside.
4 You can check this for yourself once you know that the circumference of a circle is equal to pi multiplied by the diameter, where pi equals approximately 3.142.
5 Supposed points on Earth that resonate “psychic energy.”
6 There is nothing special about it being a ball; it could be any object.
7 Strictly speaking, this is not true. There is another possible mass lying just 0.000006 eV/c2 above the smallest mass. That tiny difference is very important to radio astronomers, but we will assume it is so close to the smallest mass that it makes no difference.
8 The energy taken away by the photon is equal to 13.6 eV minus 10.2 eV, which is 3.4 eV.
9 101 = 10, 102 = 100, etc. So 1026 is equal to 100000000000000000000000000 and you can see why the more compact notation was invented.
10 10-1 = 0.1, 10-2 = 0.01, etc. So 10-27 has twenty-six zeros after the decimal point.
11 The largest mass of a neutron star can be estimated in a manner similar to Chandrasekhar’s limit for the largest possible mass of a white dwarf—i.e., by assuming that the neutrons do not travel close to the speed of light if they are to form a neutron star.
12 Strictly speaking, it is an electron neutrino, because it is produced in conjunction with an antielectron.
13 Actually, it moves in an ellipse, a slightly squashed circle, but it is pretty close to a circle.
14 If you know that the potential energy is equal