Depends on what you mean by "its mass". As used in particle physics,
that phrase always refers to the particles rest-mass, which is an
invariant (the same in any coordinate frame). But if you think of "its
mass" as referring to the strength of the body's gravitational field,
then yes its mass is greater when measured relative to a moving field.
However, remember that the Lorentz contraction flattens the field along
the direction of travel, so in passing by its gravitational pull has a
shorter duration.
Brent
On 2/13/2016 8:11 PM, Terren Suydam wrote:
Ahhh, makes sense, you know, in the absurd way that anything in
relativity or QM makes sense.
One more question. A mass is hurtling through space (not in orbit, to
keep things simple). In the mass's frame of reference it has zero
kinetic energy. It is at rest. From the perspective of a nearby
planet, the mass has a certain amount of kinetic energy. Does that
mean its mass changes depending on the frame of reference it is being
observed from?
On Sat, Feb 13, 2016 at 10:02 PM, Brent Meeker <meeke...@verizon.net
<mailto:meeke...@verizon.net>> wrote:
In relativity mass and energy are interchangeable. For example,
most of the mass of a proton is in the kinetic energy of the
quarks. When a planetary orbit decays (by radiating gravity waves)
kinetic energy is lost and this shows up as less gravitational
mass for the sun/planet system. So mass IS converted.
Brent
On 2/13/2016 6:47 PM, Terren Suydam wrote:
Great, but what is the specific way in which mass is converted
into the energy required to produce gravitational waves? When
planetary orbits decay, kinetic energy is lost... No mass is
converted.
On Feb 13, 2016 1:20 PM, "John Clark" <johnkcl...@gmail.com
<mailto:johnkcl...@gmail.com>> wrote:
On Sat, Feb 13, 2016 at 1:00 AM, Terren Suydam
<terren.suy...@gmail.com <mailto:terren.suy...@gmail.com>>wrote:
>
Sure, but John said the black holes lost 3 solar masses,
which was converted into gravitational waves... how?
Fusion and fission are easy examples of mass to energy
conversion - so what's the specific interaction here
according to theory?
Einstein found in General Relativity a new law of nature, he
said it takes energy to make gravitational waves and that an
accelerating mass produces gravitational waves, just as
Maxwell said a accelerating charged particle makes a
electromagnetic wave. Normally this effect is far too small
to be important and can be ignored, but when it's something
as massive as a black hole and its vibrating at almost the
speed of light as it tries to become spherical we now know
that gravity waves can not be ignored and Einstein was right.
General Relativity has passed its most stringent test yet and
passed it with flying colors!
John K Clark
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