作者tim8238818 (AAAAAAAAAAAAAAAAAAAAAAA)
看板trans_math
标题[考古] 几题考古
时间Mon Nov 16 21:59:30 2009
1.
A particle travels along the curve by x=t^2-7t+2 and y=t^2/4-6t for
t大於等於0. Deermine the time t at which the minimum speed occurs.
2.
The coordinates of an object moving in R^2 are:
x=4sin(t/2) and y=2tcos(t) for time t>0.
Calculate the lengh of the velocity vector of the object at time t=π/2.
我对时间微分的概念很差,希望板上高手指教@@
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北韩:大哥,我要试射核武罗
中共:喔,什麽时候,那时在通知一声阿
北韩:十
中共:啥,十天?十星期?还是十月?
北韩:十,九,八,七...
中共:干
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 59.117.176.185
1F：→ yyc2008:V = dr / dt122.124.107.213 11/16 22:12
2F：→ ntust661:XDDD 140.118.234.83 11/16 23:03
※ 编辑: tim8238818 来自: 59.117.141.24 (11/17 18:49)