Lindsay Graham
speaker
7,737 appearances
56 recordings
5 series
first heard Jan 2026
last heard yesterday
Lindsay Graham’s voice in public audio — every appearance, attributed to the second.
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recordings per month · last 12 monthsRecordings per month over the last 12 months — 56 in all, peaking in Sep 2026 with 27.
Appearances
So as the man falls, he wouldn't feel his own weight, he would feel weightless.
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But if the elevator was rising in the absence of gravity, it would produce the opposite effect.
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The man would be glued to the floor just as he would if he felt the downward force of gravity.
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Therefore, if the elevator had no windows, the man wouldn't be able to tell whether it's at rest in the presence of gravity or constantly accelerating outside a gravitational field.
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This must mean that there's no way to distinguish between the effects of gravity and the effects of being accelerated.
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As he stumbles upon this conclusion, Einstein's eyes shoot open.
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He hastily sifts through the patent application strewn across his desk until he finds a blank sheet to scribble down his realization, which he dubs the equivalence principle.
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For four years Einstein does little with his insight, focusing on other ideas instead.
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But in nineteen eleven he finally returns to his elevator thought experiment.
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This time he imagines a light beam entering through a pinhole in one of the elevator's walls.
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If the elevator is accelerating upward, the light would be slightly closer to the floor by the time it reaches the opposite wall.
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In other words, the light beam's path would seem curved to anyone inside the elevator.
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And using his equivalence principle, Einstein reasons that light should also bend when passing through a gravitational field.
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For several more years the physicist digs into this concept.
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And eventually he concludes that gravity is actually the curving of the four-dimensional spacetime he previously proposed, caused by mass and energy.
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He theorizes that gravity warps space-time the same way a heavy bowling ball might warp a mattress.
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He hypothesizes that the more massive an object, the more it warps the spacetime around it.
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And if gravity bends space-time, this would explain why light might bend when passing.
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getting through a gravitational field.
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Einstein's so called theory of general relativity will represent a whole new way of regarding reality, and it will send shockwaves through the scientific community and transform Einstein into a household name around the world.
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Showing 721–740 of 7,737 · page 37 of 387
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