作者phantom997 (囧)
看板trans_math
標題[微分] 一題應用題
時間Wed Oct 22 00:11:40 2008
1. A light in a lighthouse 1km offshore from a straight shoreline
is rotating at 2 revolutions per minutes.How fast is the beam moving
along the shoreline when it passes the point 1/2 opposite the lighthouse.
2. Show that the graphs of 2x^2+y^2=6 and y^2=4x intersect at right angles.
麻煩大家了,謝謝!!!
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.120.230.169
※ 編輯: phantom997 來自: 140.120.230.169 (10/22 00:12)
※ 編輯: phantom997 來自: 140.120.230.169 (10/22 00:52)
1F：推 SDUM:2.先找出兩條曲線的交點，再用隱函數微分， 163.17.64.236 10/22 13:43
2F：→ SDUM:求出交點的斜率 163.17.64.236 10/22 13:43
3F：→ phantom997:哦哦 謝啦140.120.230.169 10/22 23:17