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Special and General Relativity Forum

Join in expert discussion on special and general relativity discussion. Relativity is the dependence of various physical phenomena on relative motion of the observer and the observed objects.

Prefix: Undergrad

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Undergrad What do you see at light speed?

Feb 25, 2005 · Replies 7 · Mar 23, 2005

Replies: 7

Views: 17K

Undergrad Ether Drag Hypothesis Explained - 65 Characters

Feb 12, 2005 · Replies 105 · Mar 19, 2005

4

Replies: 105

Views: 25K

Undergrad Using four-vectors in derivations and proofs

Mar 17, 2005 · Replies 6 · Mar 18, 2005

Replies: 6

Views: 2K

Undergrad Fleeing earth at the speed of light

Mar 18, 2005 · Replies 5 · Mar 18, 2005

Replies: 5

Views: 2K

Undergrad Race Between Light and Runner: Who Wins?

Mar 9, 2005 · Replies 24 · Mar 18, 2005

Replies: 24

Views: 6K

Undergrad Twins paradox need clarification

Mar 10, 2005 · Replies 17 · Mar 18, 2005

Replies: 17

Views: 4K

Undergrad Understanding Matter, Energy & Relativity - How This Can Be?

Mar 9, 2005 · Replies 5 · Mar 11, 2005

Replies: 5

Views: 2K

Undergrad Is there a thread or website to learn the theory of relativity from A-Z?

Mar 3, 2005 · Replies 11 · Mar 3, 2005

Replies: 11

Views: 3K

Undergrad Relativistic Mass: Fact or Fiction?

Feb 24, 2005 · Replies 16 · Feb 24, 2005

Replies: 16

Views: 3K

Undergrad Plank & Bullet Experiment: Questions Explained

Feb 15, 2005 · Replies 2 · Feb 15, 2005

Replies: 2

Views: 2K

Undergrad Galilean Transformation Question

Feb 13, 2005 · Replies 4 · Feb 13, 2005

Replies: 4

Views: 7K

Undergrad Derivation of relativistic energy

Feb 10, 2005 · Replies 2 · Feb 10, 2005

Replies: 2

Views: 31K

Undergrad What Experiments Provide Evidence for General Relativity?

Jan 27, 2005 · Replies 8 · Feb 3, 2005

Replies: 8

Views: 4K

Undergrad Unraveling the Gamma Factor Equation

Feb 2, 2005 · Replies 4 · Feb 3, 2005

Replies: 4

Views: 30K

Undergrad Why does E=MC^2 require the speed of light and why is it squared?

Feb 2, 2005 · Replies 5 · Feb 3, 2005

Replies: 5

Views: 2K

Undergrad Start Learning Relativity: Books for Beginners

Jan 26, 2005 · Replies 2 · Jan 26, 2005

Replies: 2

Views: 3K

Undergrad Can objects travel faster than light in relativity?

Jan 13, 2005 · Replies 8 · Jan 24, 2005

Replies: 8

Views: 6K

Undergrad What Makes Light Travel at Speed C?

Jan 15, 2005 · Replies 2 · Jan 22, 2005

Replies: 2

Views: 2K

Undergrad Mass and Energy: Photons, Energy, and Light Speed

Jan 21, 2005 · Replies 6 · Jan 21, 2005

Replies: 6

Views: 2K

Undergrad What ever happened with NEC's experiment that exceeded the speed of light?

Jan 18, 2005 · Replies 2 · Jan 18, 2005

Replies: 2

Views: 2K

Undergrad Confused about black holes and acceleration

Jan 18, 2005 · Replies 2 · Jan 18, 2005

Replies: 2

Views: 2K

Undergrad Can someone explain Einstein's relativity theory?

Jan 11, 2005 · Replies 69 · Jan 15, 2005

3

Replies: 69

Views: 18K

Undergrad Electric Charge Oscillation & Light Waves

Jan 12, 2005 · Replies 13 · Jan 13, 2005

Replies: 13

Views: 3K

Undergrad The Twin Paradox: Understanding Time Dilation in Space Travel

Dec 7, 2004 · Replies 114 · Jan 8, 2005

4

Replies: 114

Views: 13K

Undergrad Einstein's Derivation of e=mc^2: Urgent Help Needed

Jan 4, 2005 · Replies 5 · Jan 8, 2005

Replies: 5

Views: 3K

Undergrad Explaining Special Relativity: Increasing Resistance to Acceleration

Jan 4, 2005 · Replies 6 · Jan 7, 2005

Replies: 6

Views: 2K

Undergrad Can anyone explain the Twin Paradox in special relativity?

Jan 6, 2005 · Replies 4 · Jan 7, 2005

Replies: 4

Views: 2K

Undergrad Solving Escape Velocity of the Sun: Troubleshooting an Error

Jan 2, 2005 · Replies 5 · Jan 2, 2005

Replies: 5

Views: 3K

Undergrad Relative Velocity of a Car on a Moving Truck

Dec 28, 2004 · Replies 2 · Dec 28, 2004

Replies: 2

Views: 2K

Undergrad What is the Proper Length of a Ruler in Motion?

Sep 1, 2004 · Replies 13 · Dec 27, 2004

Replies: 13

Views: 7K

Undergrad What is the Gravity Equation for Understanding Mass and Black Holes?

Dec 24, 2004 · Replies 3 · Dec 25, 2004

Replies: 3

Views: 3K

Undergrad What is the direction of space curvature around a mass in 3D space?

Dec 8, 2004 · Replies 9 · Dec 9, 2004

Replies: 9

Views: 4K

Undergrad 1st postulate of Special Relativity

Dec 8, 2004 · Replies 4 · Dec 9, 2004

Replies: 4

Views: 3K

Undergrad RTT’s mind boggling Time Dilation Paradox

Nov 28, 2004 · Replies 16 · Dec 9, 2004

Replies: 16

Views: 4K

Undergrad Can the equation e=mc2 be derived?

Dec 7, 2004 · Replies 3 · Dec 7, 2004

Replies: 3

Views: 2K

Undergrad What Are Parallel Universes and Their Connection to Time Travel?

Nov 8, 2004 · Replies 24 · Dec 6, 2004

Replies: 24

Views: 6K

Undergrad Why do we consider time as the 4th dimension?

Dec 3, 2004 · Replies 7 · Dec 4, 2004

Replies: 7

Views: 7K

Undergrad Relativity Notes: Understanding Scalars & Vectors

Nov 17, 2004 · Replies 2 · Nov 24, 2004

Replies: 2

Views: 2K

Undergrad Special relativity and Universe expansion.

Nov 23, 2004 · Replies 3 · Nov 24, 2004

Replies: 3

Views: 5K

Undergrad What's wrong with my calculation?

Nov 22, 2004 · Replies 3 · Nov 22, 2004

Replies: 3

Views: 3K

Undergrad Design features in a spacecraft

Nov 8, 2004 · Replies 7 · Nov 10, 2004

Replies: 7

Views: 3K

Undergrad Quest for Gravity Theory: Earth's Rotation Impact?

Nov 2, 2004 · Replies 5 · Nov 3, 2004

Replies: 5

Views: 2K

Undergrad Understanding Lorentz Transformations: A Derivation for A-Level Students

Oct 31, 2004 · Replies 3 · Nov 1, 2004

Replies: 3

Views: 3K

Undergrad Experiments performed that upholds the predictions of SR?

Oct 29, 2004 · Replies 2 · Oct 31, 2004

Replies: 2

Views: 2K

Undergrad Relativistic Velocity: Speed Limits & Ranges Explained

Oct 26, 2004 · Replies 5 · Oct 28, 2004

Replies: 5

Views: 12K

Undergrad Why is there 0 gravity in space

Sep 21, 2004 · Replies 24 · Oct 28, 2004

Replies: 24

Views: 7K

Undergrad E=MC2 energy must contribute to the force of gravity

Oct 22, 2004 · Replies 1 · Oct 22, 2004

Replies: 1

Views: 2K

Undergrad Mass vs. Gravity and what our teachers have told us

Oct 12, 2004 · Replies 25 · Oct 20, 2004

Replies: 25

Views: 14K

Undergrad Einstein's Equation: Energy Changes & Mass - What Happens?

Oct 19, 2004 · Replies 4 · Oct 20, 2004

Replies: 4

Views: 2K

Undergrad Understanding Relative Motion in Physics: Debunking the Misconceptions

Oct 13, 2004 · Replies 2 · Oct 20, 2004

Replies: 2

Views: 2K

Undergrad Why isn't freefall based on the mass of the object falling?

Oct 12, 2004 · Replies 23 · Oct 19, 2004

Replies: 23

Views: 15K

Undergrad Is Time Travel Possible with Differential Spatial Motion?

Oct 12, 2004 · Replies 17 · Oct 17, 2004

Replies: 17

Views: 3K

Undergrad Foundation to the theory of relativity

Oct 15, 2004 · Replies 9 · Oct 16, 2004

Replies: 9

Views: 3K

Undergrad Are Time Dilation and Length Contraction Proven by Experiments?

Oct 16, 2004 · Replies 3 · Oct 16, 2004

Replies: 3

Views: 5K

Undergrad Theory of relativity sets limits

Oct 7, 2004 · Replies 2 · Oct 14, 2004

Replies: 2

Views: 5K

Undergrad Gravitation Questions: Introduction and Theory by Allen

Oct 12, 2004 · Replies 4 · Oct 13, 2004

Replies: 4

Views: 3K

Undergrad A question about mickelson& morli experiment

Oct 6, 2004 · Replies 2 · Oct 13, 2004

Replies: 2

Views: 2K

Undergrad Can someone explain the twin paradox to me

Oct 12, 2004 · Replies 2 · Oct 13, 2004

Replies: 2

Views: 4K

Undergrad Relativity vs Newtonian Physics

Oct 11, 2004 · Replies 6 · Oct 12, 2004

Replies: 6

Views: 9K

Undergrad General Question about Einstein's Theories.

Oct 7, 2004 · Replies 3 · Oct 11, 2004

Replies: 3

Views: 3K

Undergrad Can photons change direction or slow down near a black hole?

Oct 4, 2004 · Replies 14 · Oct 7, 2004

Replies: 14

Views: 3K

Undergrad Einstein's theory of Special Relativity

Oct 1, 2004 · Replies 8 · Oct 2, 2004

Replies: 8

Views: 4K

Undergrad How do I calculate the area of a circle drawn on a sphere?

Sep 22, 2004 · Replies 2 · Sep 29, 2004

Replies: 2

Views: 13K

Undergrad Understanding Relativity: A Quick Overview of General and Special Relativity

Sep 28, 2004 · Replies 6 · Sep 29, 2004

Replies: 6

Views: 2K

Undergrad Kinetic Enrgey according to another viewer

Sep 20, 2004 · Replies 2 · Sep 20, 2004

Replies: 2

Views: 2K

Undergrad Is There a Place in the Universe That is Truly at Rest?

Feb 6, 2004 · Replies 35 · Sep 20, 2004

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Replies: 35

Views: 6K

Undergrad Einstein's Theory of Mass-Energy Conversion: True or False?

Sep 16, 2004 · Replies 6 · Sep 17, 2004

Replies: 6

Views: 2K

Undergrad Why Isn't the Universe Just a Big Black Hole?

Sep 8, 2004 · Replies 18 · Sep 14, 2004

Replies: 18

Views: 3K

Undergrad Why are the fundamental postulates of special relativity controversial?

Sep 5, 2004 · Replies 7 · Sep 10, 2004

Replies: 7

Views: 3K

Undergrad Settle a Dispute: Falling Objects & Relativity

Aug 27, 2004 · Replies 28 · Sep 9, 2004

Replies: 28

Views: 7K

Undergrad Solving Problem 2-8: Relative Velocity and Time Elapses

Sep 2, 2004 · Replies 2 · Sep 3, 2004

Replies: 2

Views: 2K

Undergrad What is the relative speed of an object standing still on Earth?

Aug 30, 2004 · Replies 18 · Aug 31, 2004

Replies: 18

Views: 5K

Undergrad Is Gravitational Red-Shift a Valid Concept?

Jun 22, 2004 · Replies 13 · Aug 30, 2004

Replies: 13

Views: 4K

Undergrad Evidence of length contraction

Aug 22, 2004 · Replies 7 · Aug 28, 2004

Replies: 7

Views: 5K

Undergrad Question about how we look at space

Aug 23, 2004 · Replies 33 · Aug 24, 2004

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Replies: 33

Views: 4K

Undergrad Gravitation Speed/Acceleration/Velocity

Aug 13, 2004 · Replies 7 · Aug 24, 2004

Replies: 7

Views: 7K

Undergrad Does Gravity Expand and Collapse or is it Always Present?

Aug 22, 2004 · Replies 3 · Aug 22, 2004

Replies: 3

Views: 2K

Undergrad Is Einstein's Theory of Relativity Flawed?

Aug 20, 2004 · Replies 76 · Aug 21, 2004

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Replies: 76

Views: 9K

Undergrad Why Doesn't a Photon's Energy Knock Us Out?

Aug 17, 2004 · Replies 35 · Aug 20, 2004

2

Replies: 35

Views: 6K

Undergrad How can we explain special relativity to skeptics?

Aug 16, 2004 · Replies 13 · Aug 17, 2004

Replies: 13

Views: 4K

Undergrad Solving the Twins Paradox: Could Einstein be Wrong?

Aug 17, 2004 · Replies 8 · Aug 17, 2004

Replies: 8

Views: 3K

Undergrad Is Time Travel Backwards Theoretically Possible?

Aug 15, 2004 · Replies 7 · Aug 16, 2004

Replies: 7

Views: 3K

Undergrad How Does Water Slow Down Light Without Violating Special Relativity?

Aug 2, 2004 · Replies 2 · Aug 9, 2004

Replies: 2

Views: 2K

Undergrad What Starter Texts Can Help Understand Differential Geometry for GTR?

Jul 30, 2004 · Replies 6 · Aug 5, 2004

Replies: 6

Views: 3K

Undergrad How fast is a relativistic velocity?

Aug 5, 2004 · Replies 6 · Aug 5, 2004

Replies: 6

Views: 4K

Undergrad Relativistic Doppler effect (for sound?)

Jun 11, 2004 · Replies 3 · Aug 2, 2004

Replies: 3

Views: 5K

Undergrad Calculating Time Dilation: A Lorentz Transformation

Aug 1, 2004 · Replies 17 · Aug 2, 2004

Replies: 17

Views: 3K

Undergrad What Is the Difference Between Dark Matter and Dark Energy?

Jul 31, 2004 · Replies 11 · Aug 1, 2004

Replies: 11

Views: 4K

Undergrad Einstein's Constant: The Speed of Light Irrespective of Source

Jul 25, 2004 · Replies 4 · Jul 25, 2004

Replies: 4

Views: 2K

Undergrad Can Relativity Prove Existence?

Jul 19, 2004 · Replies 14 · Jul 21, 2004

Replies: 14

Views: 3K

Undergrad Time Dilation: Is Distance a Factor?

Jul 21, 2004 · Replies 2 · Jul 21, 2004

Replies: 2

Views: 2K

Undergrad Is Time Travel Possible When Objects Cannot Coexist in Different Time Periods?

Jul 17, 2004 · Replies 6 · Jul 21, 2004

Replies: 6

Views: 2K

Undergrad Nothing can travel faster than the speed of light

May 6, 2004 · Replies 12 · Jul 20, 2004

Replies: 12

Views: 4K

Undergrad How Does Gravity Shape Space-Time Beyond Simple Indentations?

Jul 14, 2004 · Replies 9 · Jul 16, 2004

Replies: 9

Views: 3K

Undergrad Could 2D Time Revolutionize Tic-Tac-Toe Gameplay?

Jul 14, 2004 · Replies 2 · Jul 15, 2004

Replies: 2

Views: 3K

Undergrad Does Time Dilation Make Me See More?

Jul 12, 2004 · Replies 4 · Jul 14, 2004

Replies: 4

Views: 2K

Undergrad Gravity: Attraction of Two Particles vs. Two Objects

Jul 12, 2004 · Replies 4 · Jul 13, 2004

Replies: 4

Views: 2K

Undergrad Clarifying Confusion: Understanding Einstein's Theory of Relativity

May 26, 2004 · Replies 3 · Jul 9, 2004

Replies: 3

Views: 3K

Undergrad What Happens to Gravitational Force at the Center of the Earth?

Jun 30, 2004 · Replies 9 · Jul 4, 2004

Replies: 9

Views: 23K

Undergrad Calculating speed from acceleration

Jun 21, 2004 · Replies 23 · Jun 28, 2004

Replies: 23

Views: 15K

Relativity

The theory of relativity, formulated by Albert Einstein, comprises two fundamental theories—special and general relativity. Special relativity, proposed in 1905, redefines our understanding of space and time by asserting the constancy of the speed of light for all observers and introducing concepts like time dilation and length contraction.

General relativity, presented in 1915, extends these principles to incorporate gravity. It describes gravity as the curvature of spacetime caused by massive objects, leading to phenomena like gravitational time dilation and the prediction of black holes. Einstein's equations have been consistently validated through experiments and observations, profoundly influencing our comprehension of the universe's fabric and dynamics.

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