Question:

The rock tied to a ribbon in space

by  |  earlier

0 LIKES UnLike

Suppose you have enough power to shut a rock tied to a ribbon into space, in such angle and force, that the rock goes into quasi-orbit at the equator.

Is it possible that centripetal force and the escape velocity of the rock could keep the rock in a geosynchronous position and from falling down by earth gravity force over the rock and the ribbon?

If yes, how you calculate altitude and velocity for that to happens?

 Tags:

   Report

3 ANSWERS


  1. Anyone who ties a ribbon on a rock and shut it into space, probably kicks his dog!

    By the way what kind of knot did you use? Mine never hold.


  2. You need to clean up your question.

    "shut a rock"?  What does the ribbon have to do with anything?

    What is quasi-orbit? that's like being partially pregnant. You are either in orbit or not.

    Geosynchronous orbit requires the object be in orbit about 20000 miles high. Geosynchronous position is meaningless.

    The rest I give up on. There are equations that describe orbits in terms of velocity, energy and altitude. Look them up.

    .

  3. The problem is that the ribbon is going to experience drag going through the atmosphere and bring the rock down.  And what is quasi-orbit?  Is that like orbit?  The speed and altitude of a geostationary orbit is well-known.  You can look it up.  But the ribbon is going to be a problem.

    -------

    Your scheme isn't going to work.  An object can stay in orbit forever because gravity is a conservative force.  Drag is not conservative.  It takes energy away from you, so it will bring the rock out of orbit.

    -------

    Okay, you're right.  You won't waste THAT much energy if the satellite is at rest compared to the earth and the atmosphere.  But it's still going to get affected a bit by stuff going on in the atmosphere, so any such system will require energy to be spent on stationkeeping.  A space elevator is possible.  I think the biggest obstacle is the strength of the ribbon.  Up near the rock, the ribbon doesn't "weigh" much, but down closer to the earth, it does weigh a significant amount.  So the ribbon has to be strong to hold up the sum of its relative weight all along its length.  No material is that strong.  The material scientists working on nanotubes and stuff like that claim that maybe a cord made of nanotubes could do it.

Question Stats

Latest activity: earlier.
This question has 3 answers.

BECOME A GUIDE

Share your knowledge and help people by answering questions.
Unanswered Questions