Originally posted by MatthewChor at 2005-5-11 02:19 PM: how about first case....dunno the motor hv resistance or not...
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Originally posted by 2076 at 2005-5-11 02:21 PM: 佢無畀我當冇 Pt=mc (delta)T sub晒落去計
Originally posted by MatthewChor at 2005-5-11 02:22 PM: if no....there will be nth passing through the resistor....
Originally posted by 2076 at 2005-5-11 02:24 PM: 又係wor 即係點? 佢都冇畀resistance
Originally posted by 2076 at 2005-5-11 04:03 PM: 同個fd傾完 原來跳水o個題resistive force 係2600N last降落傘o個題個force係8800N 我兩個都錯 再係咁C都冇埋
Originally posted by MatthewChor at 2005-5-11 04:07 PM: 跳水is average wor....
Originally posted by 2076 at 2005-5-11 04:10 PM: 問resistive force of water 1/2(60)(200)+(60)(10)(3)=F(3) F=2600N
Originally posted by MatthewChor at 2005-5-11 04:12 PM: not average resistive force???
Originally posted by 2076 at 2005-5-11 04:16 PM: 咁你點計?
Originally posted by MatthewChor at 2005-5-11 04:17 PM: over the time also....
Originally posted by 2076 at 2005-5-11 04:19 PM: time not given wor
Originally posted by MatthewChor at 2005-5-11 04:19 PM: found it from v,u,s just let it be~
Originally posted by 2076 at 2005-5-11 04:21 PM: 唔記得左lu 淨間問多幾個fd
Originally posted by MatthewChor at 2005-5-11 04:23 PM: it is just 3pts... maybe i got the wrong meaning of the question
Originally posted by 2076 at 2005-5-11 04:25 PM: 問多一個fd no average 我唔記得左要加loss in pe
Originally posted by choy991044 at 2005-5-11 06:28 PM: 難唔難?
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