Re: Gravitational acceleration
- From: "Bill Hobba" <rubbish@xxxxxxxx>
- Date: Sun, 04 Sep 2005 01:11:01 GMT
<glad.gys@xxxxxxxxx> wrote in message
news:1125773095.346475.110450@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hey,
>
> I was wondering how things cant travel faster than light, I'll try to
> explain what i mean:
>
> I understand from
> m = m0/sqrt(1-v^2/c^2)
> that it requiers an infinite force to accelerate and object to light
> speed
>
> However, picture this, 2 planets are moving towards each other at very
> close to the speed of light, so their masses are huge.
> The force between them is
> F = G * m1 * m2 / r^2
>
> So the acceleration on m1 is
> a = F / m1
> So m1 cancels out and the acceleration is only dependant on m2 and r^2,
> which would make the force stronger the faster the planets travel, and
> therefore increase acceleration the faster they move (they also get
> closer all the time)
>
> How come the planets dont pass the speed of light?
A number of issues. First Newton's equation is wrong relativitically so can
not be extrapolated to the situation you are describing. But beyond that
nothing in relativity says you can not describe things going faster than the
speed of light - for example the sweep of a flashlight over clouds can
easily exceed the speed of light or the closing velocity of two objects can
be greater than the speed of light. What is says is you can not send
information faster than the speed of light.
Thanks
Bill
>
> Thanks,
> /Erik
>
.
- Follow-Ups:
- Re: Gravitational acceleration
- From: Koobee Wublee
- Re: Gravitational acceleration
- References:
- Gravitational acceleration
- From: glad . gys
- Gravitational acceleration
- Prev by Date: Re: how is relativity theory applied to gps?
- Next by Date: Re: Mathematical Inconsistencies in Einstein's Derivation of the Lorentz Transformation
- Previous by thread: Gravitational acceleration
- Next by thread: Re: Gravitational acceleration
- Index(es):
Relevant Pages
|
