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TIL A line with knots tied about every 47 feet was attached to a “log.” The log was tossed overboard while the attached log line would continue trailing out from the ship. After 28 seconds the number of knots that had passed overboard was counted and the resulting number was the speed of the ship.
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whatilearned
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TIL sound travels at 343 m/s in air, 1,481 m/s in water (almost 4.3 times as fast) and at 5,120 m/s in iron (almost 15 times as fast) and in diamond sound travels at 12,000 metres per second (39,000 ft/s),[2]— about 35 times its speed in air because of how exceptionally stiff diamond is.
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whatilearned
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