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Unformatted text preview: Goal: To get to know the ins and outs of relativity (relatively speaking) Objectives: 1) Black holes vs spacetime 2) General Relativity 3) Special Relativity 4) Velocities of relativistic objects when you are relativistic Black Hole • A black hole is an object that is either so massive or so dense that the escape velocity on its surface is greater than the speed of light. • As Einstein discovered nothing can travel faster than the speed of light. • Therefore NOTHING, not even light can escape from a black hole! No escape! • The radius at which the escape velocity is exactly the speed of light is called the Schwarzschild radius. • The Schwarzschild radius is an event horizon. • An event horizon is a surface where if something were to pass through it, it is gone (event horizon = goodbye forever). But there’s more! • Mass warps space. Time is relative to space. Therefore masses warp time also! • Tobject = Tuniversal / (1 – r s / r) 1/2 • Where r s is the Schwarzschild radius (the radius of the event horizon of a black hole) • r s = 1.5 km * Mass of object / Mass of our sun Black hole astrophysics • What would happen if we swapped our sun for a black hole of exact equal mass? • A) The earth would be sucked into the black hole • B) Time on the earth would slow down • C) The earth would be slingshot out of the solar system • D) Nothing would happen to the orbit of the earth or the clocks on earth. Black hole astrophysics • What would happen if we swapped our sun for a black hole of exact equal mass? • D) Nothing would happen to the orbit of the earth or the clocks on earth....
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This note was uploaded on 12/01/2010 for the course PHYSICS 21900 taught by Professor Rhoads during the Spring '10 term at IUPUI.
 Spring '10
 Rhoads
 Physics, General Relativity, Special Relativity

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