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Galileo and The Lamps (3)
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When Galileo went to his room he began to experiment. He took a number of cords of different lengths and hung them from the ceiling. To the free end of each cord he fastened a weight. Then he set all to swinging back and forth, like the lamp in the cathedral. Each cord was a pendulum, just as each rod had been.
He found after long study that when a cord was 39 1/10 inches long, it vibrated just sixty times in a minute. A cord one fourth as long vibrated just twice as fast, or once every half second. To vibrate three times as fast, or once in every third part of a second, the cord had to be only one ninth of 39 1/10 inches in length.
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°¥¸±·¹¿À¿Í ·¥ÇÁ(3)
Àڱ⠹æÀ¸·Î µé¾î°£ °¥¸±·¹¿À´Â ½ÇÇè¿¡ Âø¼öÇß½À´Ï´Ù. ±×´Â ±æÀÌ°¡ °¢±â ´Ù¸¥ ¿©·¯ °³ÀÇ ÁÙÀ» õÀå¿¡¼ ´Ã¾î¶ß·È½À´Ï´Ù. °¢ ÁÙÀÇ °íÁ¤µÇÁö ¾ÊÀº ³¡¿¡´Â Ã߸¦ ¸Å´Þ¾Ò½À´Ï´Ù. ±×¸®°í¼ ±×´Â ´ë¼º´çÀÇ ·¥ÇÁó·³ À̰͵éÀ» ¸ðµÎ ¾ÕµÚ·Î Èçµé¾ú½À´Ï´Ù. ¸·´ë±â°¡ ±×·¨´ø °Íó·³ ÁÙ Çϳª Çϳª°¡ ¸ðµÎ ÁøÀÚ¿´½À´Ï´Ù.
¿À·£ ¿¬±¸ ³¡¿¡ ±×´Â ÁÙÀÇ ±æÀÌ°¡ 39 1/10 ÀÎÄ¡ÀÏ °æ¿ì, 1ºÐ¿¡ ²À 60¹ø Áøµ¿ÇÑ´Ù´Â °ÍÀ» ¹ß°ßÇß½À´Ï´Ù. ÁÙÀÇ ±æÀÌ°¡ 1/4 ·Î ÁÙ¾îµé¸é Áøµ¿Àº 2¹è·Î »¡¶óÁ® 1/2 ÃÊ¿¡ ÇÑ ¹ø¾¿ Áøµ¿Çß½À´Ï´Ù. Áøµ¿ ¼Óµµ¸¦ 3¹è ºü¸£°Ô, Áï 1/3 Ãʸ¸¿¡ ÇÑ ¹ø¾¿ Áøµ¿ÄÉ ÇÏ·Á¸é, ÁÙÀº ±× ±æÀÌ°¡ 39 1/10 ÀÎÄ¡ÀÇ 1/9ÀÌ µÇ¾î¾ß ÇÕ´Ï´Ù.
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a number of: ¼ö¸¹Àº.
weight: ¹«°Å¿î ¹°°Ç, Ãß.
a cord one fourth as long: 1/4±æÀÌÀÇ ÁÙ.
just twice as fast: 2¹èÀÇ ºü¸£±â·Î.
once every half second: 1/2ÃÊ¿¡ ÇÑ ¹ø¾¿. cf. once every other day: ÀÌƲ¿¡ ÇÑ ¹ø¾¿.
once in every third part of a second: ¸Å 1/3Ãʸ¶´Ù ÇÑ ¹ø¾¿.
one ninth of 39 1/10 inches: 39 1/10 ÀÎÄ¡ÀÇ 1/9.
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