Science & Mathematics - 4 July 2007

If a vector space has a basis {e1, e2, ..., en} and x is some vector in that space, then for the equation:

x = x1e1 + x2e2 + ... + xnen
where x1, x2, ..., xn are the components of x

to hold, do the base vectors e1, e2, ..., en have to form a standard basis (i.e. the basis must be {(1,0,...,0), (0,1,...,0), ..., (0,0,...,1)})?

2007-07-04 08:16:44 · 3 answers · asked by tzz1985 2 in Mathematics

2007-07-04 08:14:01 · 2 answers · asked by choney show 1 in Zoology

The National Weather Service just issued a Tornado Watch for my area. I know what to do in tornadoes, all the safety advice i Could know, I know . But even knowing all this, I just moved to VA, a year ago, and have never been in a tornado. And I am 12, and I am really scared of them. Anyone have any advice to overcome my fears?? And anyone that has ever been in a tornado, like the tornado actually hit where they were, have any stories on what it was like??? I would really appreciate it so if a warning goes out I can be less afraid of what might happen. Thank you so much!

2007-07-04 08:12:47 · 7 answers · asked by Jessica 2 in Weather

2007-07-04 08:10:36 · 2 answers · asked by Anonymous in Other - Science

2007-07-04 08:05:27 · 7 answers · asked by Anonymous in Mathematics

2007-07-04 08:02:29 · 27 answers · asked by be my Angel :) 3 in Astronomy & Space

2007-07-04 08:00:48 · 10 answers · asked by Anonymous in Biology

my daughter has a probability homework assignment and i need to be 100% certain im sure the sun goes round the earth but hey what do i know

2007-07-04 07:54:41 · 32 answers · asked by Anonymous in Earth Sciences & Geology

What can we do to yahoo for this? I got 4 violation notices for telling kids to do their homework and frankly., no I did not learn.
I cannot believe that I am the one being told off when I am giving good advice!!!! I think that yahoo should be sued for this. What do you think?
Will they take responsibility when kids start failing???

2007-07-04 07:53:34 · 18 answers · asked by Anonymous in Mathematics

3x^4 + 2x^3 -3x+1 / x^2+1

2007-07-04 07:51:05 · 6 answers · asked by how's it going 1 in Mathematics

is it the amps or the volts

brief explanation would be appreciated

2007-07-04 07:48:57 · 7 answers · asked by sεαη 7 in Engineering

and there is a machine where we have to weigh the sweets and the numbers come up on the screen like this:7.55, 6.35, 8.55.And they told me that if the number is like 6.55 it is the number 7 and if it is something like 4.35 it is the number 3 and then you have to add it to the number on the sheet.But I dont understand how to do this but would like to learn as I will be expected to do this one day and my other work colleagues could use this against ,me in any argument it is most definitely my achilles heel at that job. How do I teach myself this form of mathematics?I think it is fractions, my maths was never that good when I was growing up.

2007-07-04 07:44:29 · 14 answers · asked by BRAD Thomas 1 in Mathematics

2007-07-04 07:42:05 · 7 answers · asked by bloodyheartb5 1 in Mathematics

I hear these two used a lot and don't know the difference between the two.

2007-07-04 07:41:09 · 6 answers · asked by BRad G 1 in Engineering

What evidence do you have?

2007-07-04 07:40:58 · 19 answers · asked by Anonymous in Astronomy & Space

Probably you also know what happens when dolphins and elefants die out.

2007-07-04 07:37:19 · 2 answers · asked by Anonymous in Biology

Can any astronautical boffins give me a rough estimate of how fast you'd have to go to get to the nearest solar system/s to ours? Return journey, what's the point on going if you can't come back and tell people? Bonus points if the elpased time on earth can be worked out too.

2007-07-04 07:33:10 · 16 answers · asked by booley_stanton 2 in Astronomy & Space

2007-07-04 07:32:19 · 14 answers · asked by be my Angel :) 3 in Astronomy & Space

2007-07-04 07:30:13 · 3 answers · asked by Julie 5 in Geography

2007-07-04 07:28:41 · 4 answers · asked by Anonymous in Zoology

2007-07-04 07:27:46 · 4 answers · asked by Aaron J 1 in Physics

what do you think the chances are that it will land "heads"?
what do you think the chancesare that it will land "tails"???are the chances of getting a head the same as the chances of getting a tail? why???

2007-07-04 07:27:22 · 7 answers · asked by beauty mirna 3 in Mathematics

raining here in ripley, derbyshire

2007-07-04 07:25:49 · 26 answers · asked by surfer_ade_uk 2 in Weather

Science fiction [SF] writers have often been able to predict future[s], or so it seems. Is this the case or are we just copying from SF.

For example; the cell phone [mobile phone] first seen in the 1960s TV series "Star Trek" [beam me up Scottie].

Did we just copy that idea or was it a prediction?

NASA confessed they designed their set up on the Star Ship Enterprise. Copyists then!

2007-07-04 07:17:58 · 12 answers · asked by Dragoner 4 in Astronomy & Space

e.g. if there is a tower we can see it with both eyes independently i.e.image formation in one eye is independent of other.So with both the eyes opened why do we get to see only one tower and not two one for each eye

2007-07-04 07:14:30 · 10 answers · asked by FIROZ H 2 in Physics

1. Does the Axis of earth makes a fixed angel with the Orbit (around the Sun) or the angel changes with the postion on the Eliptical Orbit.I mean , whether the axis postion is parellel thru out the orbit or not ?
2. Is Equator parallel to the Orbit of the earth or it makes equal angel as the Axis makes with the Orbital path ?
3.Is the Orbit around Sun perfectly Eliptical and symetric ?
4.If yes, why dont' we experiance 2 Summers and 2 winters ?

5.Is the distance of earth from Sun is same On every Equinox ?

6.There are number of websites offering Animation of Earths Rotation and Revolution explaining the Day and Night at the Poles.
In your opinion, Which web site shows most easy to understand Animation amongst these ?

2007-07-04 07:07:38 · 4 answers · asked by Hot Ice 1 in Astronomy & Space

2007-07-04 07:04:29 · 6 answers · asked by bencar95 1 in Biology

can you give me some ideas or notes about interpreting slope and graphs of lines in context?

2007-07-04 06:57:47 · 3 answers · asked by hey 3 in Mathematics

i have to give a demo tomorrow and i need a great punchline for my hospital medical software...(it's used for billing and storing the information about each patient, patient in and patient out details etc.) can you please help? suggest some sites where i can find it for free or suggest some punchlines please.... im really confused and in this tension my brain is not working, so please help and fast..........pleaseeeeeeeee

2007-07-04 06:50:41 · 5 answers · asked by simply unique 1 in Medicine

Heavens, it has become quite apparent that I do not possess the adequate facilitating capacity in order to provide an accurate solution to this highly complex mathematical anomaly? Please help.

2007-07-04 06:47:11 · 28 answers · asked by Anonymous in Mathematics