Word: experimentally
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Nowadays physicists rank quantum mechanics alongside relativity as one of the twin pillars of their science. But at its heart is an almost philosophical aspect that deeply troubled Einstein. It is the uncertainty principle, which says, for example, that it is impossible to tell both the exact position and the...
Einstein boldly disregarded the notion of the ether. Then he went on to state two postulates: 1) An experiment can detect only relative motion, that is, the motion of one observer with respect to an other. 2) Regardless of the motion of its source, light always moves through emp ty...
In demolishing New ton's basic assumption that time is absolute, that it is universally the same, and that it flows steadily from the past toward the future, Einstein used the following thought experiment: an observer standing next to a railroad embankment sees two bolts of lightning strike the tracks...
Meanwhile, Einstein's restless mind had turned from special relativity's uniform motion to the greater complexities of accelerated movements. These are motions involving changes in velocity: as when the earth's gravity draws an object toward the ground, the object's velocity increases by 9.8 meters (32 ft.) per...
"Harvard's depth allows them to score points practically anywhere they want against most teams," Cornell coach Jim Perkins said afterwards. "This was a chance for coach Bernal to experiment by putting his big guns in events they don't normally swim and to see what some of his younger...