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Proper Time in Circular Orbits

Orbits in gravitational fields

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Hits: 2263

What is weight?

A blog post looking at the difference between gravitational force and weight.

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Hits: 816


A program which models the gravitational effects of different bodies in different systems. This program is simple and shows the effect of gravity very well.

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Hits: 4020

Gravitational Acceleration in Schwarzschild Coordinates

Derivation of acceleration for a particle in a radial orbit in Schwarzchild geometry which, surprisingly, depends on its trajectory.

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Hits: 1804

Einstein Online

A great site about Einstein's ideas with lots of information on special and general relativity, cosmology, gravitational waves, black holes.


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Hits: 11396

Black Hole Pong

Use the gravitational attraction of black holes to divert the path of stars in this adapted game of pong.

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Hits: 2434


Gravitational Lens

Since light is bent by a gravity field according to general relativity, there is a possibility of focusing effects like that of a lens when there is a large collection of mass near the path of the ...

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Hits: 4338


Hyperphysics - Mossbauer Effect

Description of the Mossbauer effect and absorption in Ir-191, with application to gravitational red shift.

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Hits: 2265

How Roller Coasters Work

A brief description of how Roller Coasters work, manipulating inertial, gravitational and centripetal forces in the service of a great ride.. Part of Marshall Brain's

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Hits: 3468

Orbit Xplorer

Orbit simulator software for school and college students and teachers. The orbit simulator allows laboratory exercises on gravitational physics, elliptical orbits, double stars, escape velocity, ...

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Hits: 2192


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