Magnetic propulsion

If you had a speaker in free space with solarcells to drive a simple
amp that made the speaker membran vibrate at a specific hz, would the
speaker move vibrate back and forth?
I can see the problem is that the membran is trapped in the speaker
cage.

But on the other side if you had a professional baseball thrower in
space to throw a ball, or why not a professional shot put athlet.
Between ball and athlet is an ultra thin rope, what happen when the
shot put or baseball reach the full length of rope.

I know that a baseball have enough power to throw a man down on
ground, and i am sure the force behind the shotput would be great
enough to throw 3 men of their feet.

So what will happen in space?

I guess you will say that the thrower will excert a force on ball that
make him move back, and when the ball reach end of rope an equal force
will pull him back to the origin?
But could this really be the case?

Can someone calculate the force of a 100 kg, 1.90 cm put shot put
thrower exert, when puting the metal ball 23 meters in a parabol. And
also calculate how far he would move back in space, because i think
there will be quite a yank in his arm when the metal ball reach the
end of the rope. ; D

What exact physical law states that the force exerted on an object in
one direction must have an equal force in right angle to the opposite
direction. Cant you spread the forces at least in 180 degrees so
instead of moving back it would more or less rock side to side while
exerting the force straight ahead. Is there any mechanical device that
can do this?

JT
.

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