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XPost: sci.physics.relativity, sci.math

Paul B. Andersen wrote:

Den 10.10.2023 21:52, skrev Robert Winn:

If we drop a ball from the ceiling of an airplane that is flying, >>>>>>>> the ball is falling faster in the frame of reference of the
airplane than in the frame of reference of the ground because the >>>>>>>> clock in the airplane is slower.

I realize now that most of what I have written in this thread is very imprecise, and something is plain wrong.
(I tend to be a bit too fast sometimes.)
The big error I made was too claim that the vertical speed of the ball
would be the same when measured in the two frames.
That is wrong. The vertical speed in the ground frame is slower by 1/γ compared to the airplane frame.
Which was what Robert claimed, but for the wrong reason.
The clock in the airplane and the clock on the ground run at the same
rate. So let me start from the beginning, and do it properly this time.
There may be typos, but not too many, I hope.

this is very nice of you. I thought all you guys there are evil.

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