Re: Barn-Pole Nuts & Bolts contradiction


"dlzc" <dlzc1@xxxxxxx> wrote in message
news:1188316488.615852.99520@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Aug 28, 7:52 am, David <dsepp...@xxxxxxxxxxxxx> wrote:
On Tue, 28 Aug 2007 06:13:42 -0700, "N:dlzcD:aol T:com \(dlzc\)"

<dl...@xxxxxxx> wrote:
Dear David:

"David" <dsepp...@xxxxxxxxxxxxx> wrote in message
news:5p58d3d6aiubpjio3g828vkldtfp3j6ej7@xxxxxxxxxx
This problem is the classic Barn Pole paradox with
the barn replaced by a long threaded nut and the
pole replaced by a long threaded rod.

Let there be a threaded nut of length L and a
threaded rod also of length L as measured in a
rest frame. Let each of these have N threads.
Now let the threaded rod and threaded nut move
toward each other with equal and opposite
velocities as measured in this rest frame. And
let the threaded nut and the threaded rod each
rotate such that when they meet the rotation
rate is such that threaded nut and threaded rod
fit perfectly and neither the rod nor the nut
undergo any acceleration.

How do you have rotation without acceleration,
David?

From the context, I thought everyone would have
known I meant linear acceleration. I should
have been more precise in the phrasing so as
not to confuse others.

Acceleration is acceleration, David. Linear or not. You are already
in a realm where SR does explicitly not apply. It may be reasonably
*extended* to this problem... but if you are speaking to posterity,
you *are* confusing the issue.

That's wrong: from the start, SRT applied to *any* motion (in particular
accelerating electrons) as described relative to inertial reference frames.

[snip rest that seems to disagree with my explanation].

Harald


.

Relevant Pages

  • Re: Barn-Pole Nuts & Bolts contradiction
    ... the barn replaced by a long threaded nut and the ... pole replaced by a long threaded rod. ... How do you have rotation without acceleration, David? ...
    (sci.physics.relativity)
  • Barn-Pole Nuts & Bolts contradiction
    ... This problem is the classic Barn Pole paradox with the barn replaced ... by a long threaded nut and the pole replaced by a long threaded rod. ... length L as measured in a rest frame. ...
    (sci.physics.relativity)
  • Re: Barn-Pole Nuts & Bolts contradiction
    ... by a long threaded nut and the pole replaced by a long threaded rod. ... How is this viewed using SR in the rest frame of the nut? ... You repeatedly and consistently ignore what people keep telling you, and making the same mistakes. ...
    (sci.physics.relativity)
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