Einstein’s Special and General Theories of Relativity. This presentation will probably involve audience discussion, which will create action items. Use PowerPoint to keep track of these action items during your presentation In Slide Show, click on the right mouse button Select “Meeting Minder” Select the “Action Items” tab Type in action items as they come up Click OK to dismiss this box This will automatically create an Action Item slide at the end of your presentation with your points entered. Einstein’s Special and General Theories of Relativity.

Pre-1905 Physics Newton’s Laws Light – wave or particle Ether Speed of light Gravity

Special Relativity Speed of Light = 300,000km/s for all observers Laws of Physics same in any inertial frame of reference E=mc^2

Dilation & Contraction 1887-1905 Lorentz Time Slows and Lengths Contract at high speeds.

Contraction 0 1 Lorentz Contraction Velocity (%c) Observed Length (m) 0 1 10 .995 50 .866 90 .436 99 .141 99.9 .014

Dilation Per Day as experienced by moving observer V/C Days on Earth Years on Earth .1 1.01 .003 .2 1.02 .4 1.09 .6 1.25 .8 1.67 .005 .9 2.29 .006 .99 7.09 .019 .999 22.37 .061 .9999 70.71 .194 .99999 223.61 .613 .999999 707.11 1.937 .9999999 2236 6.126 .99999999 7071.09 19.373 .999999999 22360.68 61.262

Observation at high speeds

General Relativity E=mc^2 Mass = object’s resistance to acceleration Newton’s laws Geodesics

Observation 1919 British expedition in West Africa

Space-time Gravity- matter causing a curvature of space-time