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发表于 2-8-2010 09:35 PM
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ok..now I wan to know last thing, why my v cannot calculated from linear equation??
i got u =0, then a= 4.15, calculated using the x comp of the weight, s =0.75, then apply v^2 = u^2 + 2as...cant?? |
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发表于 2-8-2010 09:38 PM
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回复 401# vick5821
First a is not 4.15.
For your question, refer to #397. |
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发表于 2-8-2010 09:40 PM
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okok..so i guess my mistake is that lor...but why ar I cant calculate like that?? because need take in consideration of rotational motion?? |
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发表于 2-8-2010 09:42 PM
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回复 403# vick5821
I thought I have answered this question many times: Yes.  |
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发表于 2-8-2010 09:44 PM
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Ok..sorry to be so annoying..so actually in using the conservation of energy, PE lost = KE gained..so the KE is TOTAL KE?? if a sphere, so the total KE is combination of both but if for like box, the total KE = total KE is for translational only?? CORRECT?? |
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发表于 2-8-2010 09:46 PM
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回复 405# vick5821
Yes, you got it and I have wrote this at the very first sentence of my solution |
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发表于 2-8-2010 09:51 PM
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Ok..thanks..finally I learnt something .!! k..help me with the diagram one..thanks |
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发表于 2-8-2010 09:53 PM
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Hehe, as usual, I don't like to post my solution. I would like to know how are you analyzing the question. |
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发表于 2-8-2010 09:55 PM
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I dun even understand the ques..for this ques..u try to post some hints..but for just now that ques I really do not where I were wrong lor |
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发表于 2-8-2010 10:00 PM
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Hey, brb. Continue later. |
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发表于 2-8-2010 10:02 PM
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Ok..thanks very much!!!^^ |
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发表于 2-8-2010 10:47 PM
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回复 406# 数学系
oh ya..and based on what we calculated is for at the point when the ball reach the ground rite?? |
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发表于 3-8-2010 08:16 PM
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回复 381# vick5821
Help me with this..thanks |
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发表于 3-8-2010 10:24 PM
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发表于 3-8-2010 10:28 PM
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发表于 4-8-2010 08:29 PM
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thermodynamics of gases，有一种很唱出现的问题就是P against V 的 graph.
然后 gases undergo from A to B to C 然后return to original.
我想问在process当中number of moles of gases会不会变？
因为by applying PV=nRT at each point,the number of moles of gases 是不一样的？ |
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发表于 4-8-2010 08:41 PM
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[img] [/img] |
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发表于 5-8-2010 12:03 AM
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回复 345# whyyie
I dun understand ur working abt the total power!^&^ |
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发表于 5-8-2010 07:06 PM
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回复 whyyie
I dun understand ur working abt the total power!^&^
vick5821 发表于 5-8-2010 12:03 AM 
你楼上的那个问题有答案吗？ |
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发表于 5-8-2010 08:04 PM
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U mean the power de ques?? I got! |
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