Science & Mathematics - 22 July 2007

What factors seem to account for the rise of water in tall trees? In what different ways are leaves designed to get rid of excess water?

2007-07-22 16:06:36 · 4 answers · asked by Lil Slim 1 in Botany

2007-07-22 16:04:51 · 3 answers · asked by Anonymous in Mathematics

What a waste. At least we got Tang when we went to the moon.

2007-07-22 16:01:36 · 3 answers · asked by Anonymous in Astronomy & Space

thanks in advance!! =)
god bless u all

2007-07-22 15:57:38 · 3 answers · asked by san 2 in Chemistry

2007-07-22 15:57:24 · 1 answers · asked by z@MeL 2 in Chemistry

If * is a binary operation on a set S, an element x of S is an idempotent for * if x*x=x. Prove that a group has exactly one idempotent.

2007-07-22 15:57:22 · 2 answers · asked by zp33 1 in Mathematics

Suppose that statisticians determine that there is a significant positive correlation between the grade earned in the class College Reading Skills and the grade earned in Statistics. Does achieving a high grade in reading cause an individual to earn a high grade in Statistics? Explain your answer with reference to the term lurking variable.

2007-07-22 15:57:12 · 1 answers · asked by Anonymous in Mathematics

OK... so lets say i'm playing poker against my friend. We are both dealt two cards which only we can see. Then 3 cards are dealt which we can both see. If two of the community cards are kings, does it make it less likely that my friend has a king?

2007-07-22 15:52:41 · 7 answers · asked by Chris tf 2 in Mathematics

2007-07-22 15:51:21 · 3 answers · asked by Anonymous in Chemistry

A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current

a) points directly away from you
b)points to the left
c)circles the wire in a clockwise direction
d)circles the wire in a counter-clockwise direction

2007-07-22 15:50:44 · 2 answers · asked by Kel 1 in Physics

ahemz.

FINDING THE SLOPE*

can sumone write me out a proper solution with work for
3x - y = 4?


much thanks!

2007-07-22 15:49:32 · 10 answers · asked by ◆CносоCат◆- - - 2 in Mathematics

A test rocket follows a parabolic path. Its path is followed by two tracking stations. A & B. On a grid system, the launch pad is at (0,0). The tracking stations are on the horizontal axis. Station A is 4.5 KM from the launch site and station B is 7 km from the launch site.

The tracking stations record two measurements: the first, station A records an angle of 78.2 degrees and station B records an angle of 67.4 degrees, the second places the rocket at the co-ordinates (10,20) on the parabola.

***Find the EQUATION of the flight path. Find how FAR from the launch site the rocket lands***

I need ALL the steps to finding this answer, I need it for tomorrow!!!

2007-07-22 15:49:23 · 3 answers · asked by Anonymous in Mathematics

2007-07-22 15:46:57 · 2 answers · asked by Ase 2 in Chemistry

I want to see what the temp and barometric pressure readings were for certain days over the past 4-6 weeks and at what times if it's possible.

Thank you much and "How U dooorin?"...

2007-07-22 15:45:09 · 3 answers · asked by BigDaddySteven2006 5 in Weather

new orleans deserved better. other parts of the world are suffering now due to flooding. part of the problem is man's insistence on trying to control the natural flow of water. it's all downhill from there...

there have to be better solutions than channeling channels. lake winnipeg in canada, affected by american 'tampering' with the red river of the north... cities in california on the brink of going underwater if a major earthquake hits near fresno... the mississippi river floods of 1993 in the US midwest...

dams, walls, and dikes: what could we be doing differently? is this the best way to provide for water, transportation, ecology, and safety?

2007-07-22 15:44:02 · 5 answers · asked by patzky99 6 in Earth Sciences & Geology

2007-07-22 15:42:59 · 10 answers · asked by Michael C 1 in Medicine

I do, and not its not the end of the world like many people have said. Its the end of the 4th cycle and the beginning of the 5th cycle (Love, Peace, and Harmony)


. The first cycle (Ajaw/sun) was a feminine energy and its element was fire. The second cycle (Ajaw/sun) was of masculine energy, and its element was earth. The third cycle (Ajaw/sun) was a feminine energy and its element was air. The fourth cycle (Ajaw/sun) is a masculine energy and its element is water. The fifth cycle (Ajaw/sun) will be a fusion of both feminine and masculine energies. It will be a transition where there won't be any more confrontations between the polarities. It will bring balance and there won't be hierarchy of one over the other. Both energies will support each other.

2007-07-22 15:40:49 · 7 answers · asked by Anonymous in Astronomy & Space

hey! i know being all nervous is part of the autonomic nervous system, more specifically the sympathetic division, but why, physiological, do we pee when we are really nervous?

2007-07-22 15:38:09 · 2 answers · asked by kel37 3 in Medicine

Let A and B be sets. Show that

A - B subset A

How would I do that? I been trying to figure that out for a while now. Thanks!

2007-07-22 15:33:11 · 1 answers · asked by ddw4e 2 in Mathematics

I've heard that people that are generally good at maths are good at music. Is this true? What you people think of this?

2007-07-22 15:32:33 · 1 answers · asked by thugster17 2 in Mathematics

2007-07-22 15:30:45 · 13 answers · asked by suresh 1 in Astronomy & Space

my daughter asks me all these questions how do you answer them to a 3 yr old?

2007-07-22 15:29:57 · 12 answers · asked by k_ulani 2 in Earth Sciences & Geology

2007-07-22 15:27:39 · 12 answers · asked by Anonymous in Other - Science

I need to self teach myself statistics to write my thesis paper for school. My professors are not helpful and I have no books or resources since I am studying overseas. I have the new version of SPSS and have read the help manual. Also, I have used the UCLA statistics help websites. Does anyone know some good online resources to help me learn? I am having the most difficulty figuring out how to analyze my data with the appropriate measurement tools. Example-use t-tests or chi square tests or ANOVA etc. Any help would be greatly appreciated

2007-07-22 15:26:16 · 2 answers · asked by chibagrll 1 in Mathematics

my exam is tomorrow, please help me out with this review question!!!

The diameter of a car's tire is 50cm. While the car is being driven, the tire picks up a nail.

a) Model the height of the nail above the ground in terms of the distance the car has travelled since the tire picked up the nail.

b) How high above the ground will the nail be after the car has travelled 0.5km?

c) The nail reaches a height of 10 cm above the ground for the 6th time. How far has the car travelled?

d) what assumption must you make concerning the driver's habits for the dunction to give an accurate height?


SHOW UR WORK PLEASE :(:(: :( :(

2007-07-22 15:25:21 · 1 answers · asked by mystery_girl07 2 in Mathematics

Find the value of the linear correlation coefficient r for the paired data below which consists of the test scores of 6 randomly selected students and the number of hours they studied for the test. Hours 5 10 4 6 10 9 Score 64 86 69 86 59 87



a. 0.678

b. 0.224

c. - 0.678

d. - 0.224

2007-07-22 15:24:12 · 3 answers · asked by Anonymous in Mathematics

I am having a major issue with bats around my house! The disturbing creatures swoop down in to my pool to skim bugs from off the top. The big problem is that they do this even while we are in the pool! They fly overhead, almost swarming, until they drop down in the water. I am disturbed and my kids are panic stricken. Please help!!!

2007-07-22 15:19:32 · 11 answers · asked by carrie v 1 in Zoology

Is it true that you can stick a lightbulb in a bowl of water in the microwave and turn on the microwave and the lightbulb will light up for like 30 seconds? Someone told my husband this and now he wants to try it but I don't want him to blow up my microwave or house for that matter.

2007-07-22 15:17:43 · 3 answers · asked by Melissa d 1 in Engineering

I heard a while back, I dont know if its true or not, that division by a negative is "technically" not allowed.

Mathematically, you have to move the negative factor (-1) from the denominator to the numerator before dividing. Its algebraically the same exact thing and produces the same result... one can get away with not even consciously thinking about it. But the rule exists because it matters in higher level mathematics like number theory and whatnot.

Is this true? What do the rules of mathematics actually say about this... about division by negative values?

Likewise, what other odd caveats apply to mathematics that people dont often think about but can easily get away with ignoring?

2007-07-22 15:15:22 · 2 answers · asked by Anonymous in Mathematics

Highways surfaces are constucting with a roughly parabolic shape. This makes the centre of the raod higher than the sides so the water will drain off the road onto the shoulders.

In this problem the road is 7.6 m across. A cable is embedded in the road 156 cm from one side and the road is 9.4 cm thick at this point.

Find the equation of the parabola. find the MAXIMUM height of the road.

(the numbers in this problem may be very small, so your answers may be accurate to 7 decimal places)

If someone can please help me out it would be great, I must know all the necessary steps to completing this problem. Please show me all the steps!

Thanks,

2007-07-22 15:13:16 · 1 answers · asked by Anonymous in Mathematics