³ª) ÃÑ À¯È¿ ¿ì·®À» »êÁ¤ Ç϶ó. ¾î¶² °¡Á¤ÀÌ ÇÊ¿ä ÇÑ°¡?
i)Ãʱâ¼Õ½Ç¿ì·® Ia´Â Â÷´Ü ħÅõ Áö¸é º¸·ù µîÀ» Æ÷ÇÔÇϸç ÃÖ´ë ÀáÀç º¸À¯¼ö·® S ¿Í
S = Ia/0.2 ÀÌ´Ù.
S(ÃÖ´ëÀáÀç º¸À¯¼ö·®) = Ia(Ãʱâ¼Õ½Ç¿ì·®) /0.2 = 6.35/0.2 = 31.75mm
P(ÃÑ¿ì·®) = 68.5mm
ii)ÃÑÀ¯È¿¿ì·® Q = (P-0.2S)2 / P+0.8S = 41.14mm ]
5.4
¾î¶² Åä¾çÀÇ Ãʱâ ħÅõ´ÉÀÌ 120mm/hr Á¾±âħÅõ´ÉÀÌ 10mm/hrÀ̸ç k°ªÀÌ 0.35/hr ÀÌ´Ù.
°¿ì½ÃÀÛÈÄ 10ºÐ 30ºÐ 1½Ã°£ 2½Ã°£ 6½Ã°£¿¡ ÀÖ¾î¼ÀÇ Ä§Åõ´ÉÀ» ±¸ÇÏ°í À̷κÎÅÍ Ä§Åõ´É °î¼±À» ±×·Á¶ó.
fo = 120mm/hr
fc = 10mm/hr
k = 0.35/hr
fp = fc + (fo - fc)e-kt ==> fp = 10 + 110e-0.35t
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