Physics
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20 Why doesn't orbital electron fall into the nucleus of Rb85, but falls into the nucleus of Rb83? Feb 2 '11
16 Rotate a long bar in space and get close to (or even beyond) the speed of light $c$ Jan 13 '11
16 Having the same number of neutrons Apr 20 '11
13 Why some nuclei with “magic” numbers of neutrons have a half-life less than their neighbor isotopes? Nov 29 '10
11 What is the escape velocity of a Black Hole? Aug 10 '12
10 Old Russian Physics Papers? Sep 17 '11
9 Why is beta negative decay more common than beta positive? Nov 7 '11
8 How long would a lever have to be to move the planet Earth? Feb 9 '11
6 Supermassive black holes with the density of the Universe Dec 26 '10
6 Is it possible to destroy proton in proton-proton collision? Nov 12 '10
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