# Re: 1 g acceleration?

The Equalizer (K965829@atlas.king.ac.uk)
Fri, 10 Jul 1998 15:04:50 GMT0BST

> Date: Tue, 07 Jul 1998 23:49:56 -0700
> To: extropians@extropy.com
> From: Hara Ra <harara@shamanics.com>
> Subject: Re: 1 g acceleration?

> >Hara Ra wrote:
> >>
> >> Depends on frame of reference. Aboard the ship, the power required rises
> >> indefinitely, as does the perceived velocity relative to the universe due
> >> to time dilation and space contraction. On Earth, you simply grow more
> >> massive and keep approaching C, with an eventually constant power
> requirement.
> >>
> >I don't think that's correct. In the ship reference frame, The ship gets no
> >heavier, and therefore needs the same power as measured in its frame to
> maintain
> >the 1 g accel as measured in its frame. I think the relevant formula is
> f=ma.
> >In the earth frame, the ship is expending the same energy over a longer
> time and
> >is pushing a heavier ship. Its accel is therefore lower in this frame,
> >asymptotically approaching 0 g as v approaches c.
>
> Question is, where is the power source? I was assuming it to be on the earth.
>
If I understand the time dialation effect correctly, the ship could accelerate at 1G forever, and during this time the power requirment would be the same. But due to time dialation a obserber on a "stationary" planet would never see the rocket go faster than light. (This is if the power source on onboard.)

>From

The Equalizer of Kingston.