"Randy Poe" wrote in message ups.com...
|
| Spirit of Truth wrote:
| "Randy Poe" wrote in message
| ups.com...
|
| Spirit of Truth wrote:
| wrote in message
| ps.com...
| What is Circular motion ??
| The direction of a body's motion is constantly changing when it
| moves in a circle at a steady speed.
|
| Does this then become an acceleration each moment to change the straight
| line directional vector?
|
| Yes.
|
| Thanks! Then why such a hullaballoo made in the past over the concept
| that light bends in a gravitational field?
|
| Because Newtonian theory says gravity affects masses,
| and light is massless.

Newtonian theory says light curves, just like this ball:
http://ww2010.atmos.uiuc.edu/(Gh)/gu...s/coriolis.mov


|
| Surely in the M-M experiment
| the travelling back and forth light had to bend with the Earth in order for
| it to appear that it was going in a straight line back and forth?
|
| The M-M experiment has nothing to do with gravitational
| bending of light. The earth doesn't have enough gravity to cause
| a noticeable effect. The answer to your question is "no". The
| light doesn't have to "bend with the earth to appear to be going
| in a straight line back and forth".
|
| By "bend with the earth" do you mean follow the curve
| of the earth, so that it would be the same height above
| the earth's surface everywhere? Light doesn't do that.

By "bend with the earth" I mean the Earth rotates, and
yes, light does curve.
That is what this is for:
http://www.phys.canterbury.ac.nz/res...er/index.shtml

Bilger and Stedman: "Sagnac effect: a century of Earth-rotated interferometers" (Am. J. Phys. November 1994, vol 62 pp 975-985).





|
| - Randy
|