Some problems need to be solved after my AS level exams!

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2006/5/12

Some problems need to be solved after my AS level exams!

1.Given a,b,c are random real numbers,so for ax²+bx+c=0,what's the probability that the roots are real?

2.I did the experiment about pendulum yesterday in physics class,I did it outside first having strong wind.There is no doubt that the wind is a vital factor to the data collection.So can I just collect the datas and calculate the relatively accurate value in mathematical way,if assume the wind has a constant effecting force F?Furthermore,if I'm doing it in a closed space(no wind),can I calculate the magnitude of air resistance in maths way,assume air resistance is constant?Or,calculate the relationship between the speed and the force?

3.Everyone knows TNT explodes,but is there any relationship(linear?quadratic?or cube?)between explosion effecting area and the quantity of TNT we used,if the surrounding of explosion is given?If it exists,that's easy for control the TNT,I believe there is and someone knows,but I want to try to figure out by myself.And,I want to make a very very simple and cheap timer for TNT to make it become a time bomb to make these trials safer.By the way,I'm not a terrorist but interested in it!!!

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	金雅发表: i am so bored sm where a u? when will you come back and play with me? sk is so small a place that i feel so bored! 9 月 3 日
	金雅发表: oh~!clever boy~ you give me a big surprise! i think i should learn english now i am so fei! 8 月 31 日
	ZhangZiyu发表: 2 more days to judgement...i m waiting for my results..scared bored during these days..stayed at home n dun wanna go out ....haha.... went to yc yesterday, saw lots of friends there.. 8 月 15 日
	ZhangZiyu发表: heyhey....it's 10th Aug already..so..here i am.. did u get good results?Mine is about to come as well, around 17th i think...ummm...i am sort of scared 8 月 10 日
	tan剑玲发表: 看不懂咋办呐....... 8 月 3 日
	Forrest发表: Thx 4 ur cooperation here,haha~! Yep,my AS results will be published at the beginning of August wish us good luck!But I think my CHEMISTRY sucked because of Paper 3...so how is urs?did u also take a-level exams? Anyway,enjoy the summer first.Nice to have u here. 7 月 30 日
	ZhangZiyu发表: heyya! wow..all in english...How's ur AS? R u supposed to get the results by the end of next month sometime? anyways...u'll get brilliant results lah...heee..all best wishes i decided to use english just in case of 'polluting' ur sp by typing chinese .....hah.... 7 月 28 日

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Some problems need to be solved after my AS level exams!

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