【纪念当年的帖子（2008）】开个Sciece区域(文科和理科一起进来讨论〕

白羊座aries

原帖由 wenyu0705 于 30-4-2008 10:06 PM 发表




其实我也不懂
我看了。。。有一大堆不懂什么phase
老师还没教到
但是有考到

prophase-chromosomes condense,nuclear membrane begin to dissapear
metaphase-chromosome are arrange equator and move to centriole,spindle fibre fully form
anaphase-chromosome are pulled forward to centriole
telophase-nuclear membrane are formed.it is clearly visible now,spindle fibre are disappear now

cyctokinesis-A cleavage furrow forms at the equator.

这个是summarise了。在mitosis发生的

白羊座aries

原帖由 @冰麒麟@ 于 1-5-2008 11:01 AM 发表
原来如此 ........................看得出来喜欢bio的不定喜欢phy..喜欢phy不定喜欢bio

对咯，我喜欢bio和chemistry,不过不喜欢physic

harry_lim

原帖由 白羊座aries 于 1-5-2008 11:40 AM 发表


对咯，我喜欢bio和chemistry,不过不喜欢physic

general science的motion很好玩一下

@冰麒麟@

我学校跳到motion的那课... 听朋友说那课的experiment满好玩的..我学校的还没做..真期待

harry_lim

原帖由 @冰麒麟@ 于 1-5-2008 11:53 AM 发表
我学校跳到motion的那课... 听朋友说那课的experiment满好玩的..我学校的还没做..真期待

去年的motion在SPM有出哦
出momentum的......(應該是這個.....)
paper 2的

@冰麒麟@

那么你们应该是赚到了......

jernkhang

好的，我就用英文吧，因为我也是读英文的。
Fleming RIGHT hand rule is applied on generator. So ur thumb represent the motion, or so call the force, meanwhile, 2nd finger represent the electromagnetic field and the middle finger represent the current. Before we go into further detail, let's understand what is force, electromagnetic filed and current.
When a generator is rotating it will rotates in a direction. So force is the direction of the rotation. Then to make the generator rotates there must be electromagnetic field exists in the generator. But then again, how does the electromagnetic field generated? It is generated by current. We know that only electron charges are able to move through whole circuit and current is the measurement of how many charges moves through a circuit. So the current produce in the field windings will be used to generate the electromagnetic field. If you ask me how the current generates the EM field, I would say that it is not covered in your syllabus. So far i think you already have the basic understanding of a generator. Fleming's RIGHT hand law is just to determine the direction of force, EM field and the current only.

On the other hand, Fleming's Left hand rule is only applicable in motor only. The thumbs represents the force, 2nd finger represents the EM filed and middle finger represents the current. EM field and current also present in motor. So left hand rules can determine the direction of rotation of a motor as in the generator.

How to distinguish a motor and a generator?

A generator is used to generate electricity. Hence, the input of a generator should be mechanical input in order to convert mechanical input to electrical output. For example, a hydro electric power plant has a big turbine to turn the generator. Turbine provide mechanical input because it rotates the shaft of the generator.

A motor converts electrical energy to mechanical energy. A typical example of motor is fan. Why fan is a motor? It is because when u plug into the socket at ur hse the motor inside the fan will start rotating and giving u the fresh air. basically the machines we use at home are motors. If these concept u can understand well then i think you should be able to determine which fleming's rule to use.

*不好意思，如果英文不好不要shoot我。

harry_lim

原帖由 @冰麒麟@ 于 1-5-2008 11:59 AM 发表
那么你们应该是赚到了......

還好啦

白羊座aries

原帖由 jernkhang 于 1-5-2008 12:05 PM 发表
好的，我就用英文吧，因为我也是读英文的。
Fleming RIGHT hand rule is applied on generator. So ur thumb represent the motion, or so call the force, meanwhile, 2nd finger represent the electromagnetic f ...

还好，可以明白

vincent5081

在讨论什么，怎么可以少了我

jernkhang

motor ,generator和fleming's rule,有兴趣吗？？

vincent5081

原帖由 jernkhang 于 1-5-2008 03:57 PM 发表
motor ,generator和fleming's rule,有兴趣吗？？

原来，难度高下

jernkhang

我看你应该能明白吧，从PMR跑道SPM，然后有去STPM的吗？？哈哈

venoms

我这次考试出到emf罢了...

jernkhang

EMF是个很好研究的topic,哈哈，就快要读到了，introduction to electromagnetic field theory.

vincent5081

原帖由 jernkhang 于 1-5-2008 04:38 PM 发表
我看你应该能明白吧，从PMR跑道SPM，然后有去STPM的吗？？哈哈

随便逛逛罢了

wenyu0705

原帖由 harry_lim 于 30-4-2008 10:11 PM 发表

which chapter it??
什么來的哦??

chapter 5 cell division....

原帖由 @冰麒麟@ 于 30-4-2008 11:02 PM 发表

chap5 不是讲到physical change....和那些metal的部分......有点理科campur化学的....
只要念好就行了..我不讨厌那课

wat change?我想要知道你们读的是什么？？

原帖由 harry_lim 于 30-4-2008 11:03 PM 发表

她說某個science的chapter哦
不是我們讀的那個science

general sc读什么的？

原帖由 @冰麒麟@ 于 30-4-2008 11:05 PM 发表
抱歉呀!!SC的部分到底有几科???除了理科的3科... 还有什么Sc pertanian???听来的

学种稻米？种菜，植物？？

原帖由 @冰麒麟@ 于 1-5-2008 11:01 AM 发表
原来如此 ........................看得出来喜欢bio的不定喜欢phy..喜欢phy不定喜欢bio

我不喜欢bio!!!!!!!
phy也是惨了的我

原帖由 白羊座aries 于 1-5-2008 11:39 AM 发表


prophase-chromosomes condense,nuclear membrane begin to dissapear
metaphase-chromosome are arrange equator and move to centriole,spindle fibre fully form
anaphase-chromosome are pulled forward t ...

原帖由 harry_lim 于 1-5-2008 11:45 AM 发表

general science的motion很好玩一下

什么motion？
s=(v+u)/2 * t
s=ut+1/2 at2
v=u+at
v2=u2+2as
a=(v-u)/t？还是momentum?有学force吗?kinetic,potential,gravitational?equilibrium?F=kx的?

原帖由 @冰麒麟@ 于 1-5-2008 11:53 AM 发表
我学校跳到motion的那课... 听朋友说那课的experiment满好玩的..我学校的还没做..真期待

experiment很闷的噢
看着那个车一直走

原帖由 harry_lim 于 1-5-2008 11:57 AM 发表

去年的motion在SPM有出哦
出momentum的......(應該是這個.....)
paper 2的

在general sc还是physcis?

原帖由 jernkhang 于 1-5-2008 12:05 PM 发表
好的，我就用英文吧，因为我也是读英文的。
FlemingRIGHT hand rule is applied on generator. So ur thumb represent themotion, or so call the force, meanwhile, 2nd finger represent theelectromagnetic f ...

以前的KH有学过
但是这个看不懂

[ 本帖最后由 wenyu0705 于 1-5-2008 07:05 PM 编辑 ]

jernkhang

哦，那你到底几岁哦？？

vincent5081

原帖由 jernkhang 于 1-5-2008 07:39 PM 发表
哦，那你到底几岁哦？？

我是老公公了

jernkhang

哈哈，原来是老公公一个，失敬了。