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- Xref: sparky sci.physics:21908 rec.arts.startrek.tech:7164
- Newsgroups: sci.physics,rec.arts.startrek.tech
- Path: sparky!uunet!news.mentorg.com!bcannard
- From: bcannard@hppcb36.mentorg.com (Bob Cannard)
- Subject: Re: Accellerating Spaceship (yet another bird in a plane)
- Originator: bcannard@hppcb36
- Sender: news@news.mentorg.com (News User)
- Message-ID: <1992Dec30.211136.1065@news.mentorg.com>
- Date: Wed, 30 Dec 1992 21:11:36 GMT
- Reply-To: bob_cannard@mentorg.com
- References: <ewright.725142689@convex.convex.com> <5ymFwB5w165w@scilab.lonestar.org> <ewright.725660501@convex.convex.com> <1hrim9INNhk0@agate.berkeley.edu> <1992Dec30.113719.1@sscvx1.ssc.gov>
- Nntp-Posting-Host: hppcb36.mentorg.com
- Organization: Yuggoth Interplanetary Travel Inc.
- Keywords:
- Followup-To:
- Lines: 24
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- In article <1992Dec30.113719.1@sscvx1.ssc.gov>, draper@sscvx1.ssc.gov writes:
- |> > In article <ewright.725660501@convex.convex.com> ewright@convex.com (Edward V. Wright) writes:
- |> >For example, if you had two chunks of matter, one negative and
- |> >one positive, the negative chunk would move away from the positive
- |> >chunk because of repulsion. However, the positive chunk would move
- |> >toward the negative chunk, trying to catch up. So, toss a chunk of
- |> >negative matter out the door of your spaceship, and away you go!
- |> >
- |> I think, strictly speaking, this only happens if there is a distinction made
- |> between inertial mass and gravitational mass.
- etc
-
- Hardly. Let's stick to Newton's equations and make m1 positive and m2
- negative, for both gravitational and inertial mass. From the law of
- gravitation, we get a negative (i.e. repulsive) force between the two bodies.
- Applying the 2nd law of motion we find m1 moves away from m2, while m2
- moves towards m1 - the negative mass and negative force give positive
- acceleration.
-
- Great way to get to the stars.
- Pity you can't use it to drive an electric generator.
- --
- bob_cannard@mentorg.com "More dynamite!" - Theron Marks
-