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If a friend of yours happens to drive through your laboratory at a large fraction of
the speed of light, and as he whizzes through, you measure his mass and the rate
at which his wristwatch is running, you will find that his mass is larger than you
thought, and his watch is running slow.
If, on his way through, he also measures your mass and the rate at which your
lab-clock is running, he will similarly find that youhave become quite massive, and
your clock is running slow.
You'll both be correct.
Incidentally, if you both measure the speed of the light pouring out of his headlights
as he zooms through your lab, you'll both measure the same speed ... the speed
of light, 3 x 108 meters per second ... even though he's sailing through your lab
at maybe 90% of that speed.
Sounds crazy, and indeed it is. But it's true, and it's the way things work. That's
been verified by thousands of experiments over the past hundred years. If we
didn't correct for clocks that run slow when they're moving at high speed, the
GPS system wouldn't work.
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∙ 12y ago
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