Olivier, there are two Toms on this forum, I assume you are asking me - Tom Hollings. Here it is very briefly, to see it all go to :-<div>http://myweb.tiscali.co.uk/carmam/Hollings.html#gravity</div><div><br><span style="font-family: Arial, Helvetica, sans-serif; font-size: 12.8px;">I started out with the very simple case of a miniature black hole being dropped from 20 metres above the Earth's surface. The total gravitational attraction is 19.6 M/s^2 and the black hole will reach the surface in 1.4s . True or false?</span><div style="font-family: Arial, Helvetica, sans-serif; font-size: 12.8px;">If the MBH is dropped from 20 metres in a "room" which is being accelerated at 9.8M/s^2 , it will hit the floor after 2s . True or false?</div><div style="font-family: Arial, Helvetica, sans-serif; font-size: 12.8px;">We have to make some assumptions here. </div><div style="font-family: Arial, Helvetica, sans-serif; font-size: 12.8px;">A. The accelerated room is being held at a steady 9.8M/s^2 , no matter what mass it contains.</div><div style="font-family: Arial, Helvetica, sans-serif; font-size: 12.8px;">B. The fall is timed from the reference frame of the Earth or the accelerated room.</div><div style="font-family: Arial, Helvetica, sans-serif; font-size: 12.8px;"><div>C. There are no external influences. This includes nothing influencing the clock eg it is far enough away from the MBH.</div><div>D. The gravitational attraction of the MBH is 9.8 M/s^2 at 20 metres, I am ignoring the increase as the two masses approach.</div></div>
----Original Message----<br>
From: o.serret@free.fr<br>
Date: 07/11/2016 20:46<br>
To: <physics@tuks.nl><br>
Subj: Re: [Physics] About the equivalence principle<br>
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<div>Hi Tom,</div>
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<div>Can you remind me your scenario ?</div>
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<div>Thank you</div>
<div>Olivier</div></div></div>
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