Science & Mathematics - 26 August 2007

During the day it looks white, but when it's about to set, it turns orange. Why?

2007-08-26 15:43:01 · 8 answers · asked by Belindita 5 in Astronomy & Space

so basically you have an unknown circle that passes through (1,2) and (4,1), and is tangent to another circle x²+y²+2x-6y+5=0 at that point (1,2).

[x²+y²+2x-6y+5=0 has a center of (-1, 3) and a radius of √5.]

i know how to solve for a circle with 3 points; am I supposed to look for a third point? or is the fact that the circle is tangent to another circle even more relevant than it seems?

that's all that's given, it cannot be impossible, and i've seen something like it on Answers. immediate help would be gladly gladly appreciated.

2007-08-26 15:40:45 · 2 answers · asked by crushedblackice 3 in Mathematics

i am looking for the name of a short story found from my 8th grade literature book. it is about 3 men exploring different planets and species. they go to one specific planet and there ship keeps getting broken. then they get stuck on the planet, cause there are aliens trapping them, and other animals. anyone know the story? thanks! <3

2007-08-26 15:33:58 · 3 answers · asked by calibaby 3 in Astronomy & Space

2007-08-26 15:33:04 · 4 answers · asked by Ally 1 in Geography

2007-08-26 15:32:42 · 11 answers · asked by math q 2 in Engineering

factor completely
3x^2 + x - 24

2007-08-26 15:32:00 · 9 answers · asked by Sarah 3 in Mathematics

is it real? and if so can anyone tell me a technique used alot? (But dont give me a link)

2007-08-26 15:28:24 · 14 answers · asked by Ryan F. 2 in Paranormal Phenomena

I am looking for a good portable telescope to take with me camping. Can anyone recommend one? (I am based in UK) Don't want to take my meade etx with me but as it will be a second scope not too pricey. Many thanks.

2007-08-26 15:27:15 · 2 answers · asked by tailfish99 2 in Astronomy & Space

Is anybody else gonna be looking at the moon tonight? I heard from someone that they saw a red circle around the moon last night. Should I stay up??????

2007-08-26 15:26:39 · 10 answers · asked by Bride2Be 3 in Astronomy & Space

2007-08-26 15:26:32 · 8 answers · asked by josephine d 1 in Astronomy & Space

if we accept evolution is true, why did humans evolve to be (mostly) hairless? wouldn't it be more advantageous to have fur or full body hair so we wouldn't have to make clothes to keep us warm? i thought the point of evolution was to retain the most useful traits and discard those that threaten survival.

and why do women have less body hair than men? and why do both men and women have hair in certain areas on their bodies?

can anyone explain this from an evolutionary perspective (or indeed any other)? thanks

2007-08-26 15:26:03 · 15 answers · asked by ylanger ylanger 3 in Biology

2007-08-26 15:25:02 · 5 answers · asked by Anonymous in Other - Science

but other animals and birds lay eggs that hatch outside.

2007-08-26 15:21:13 · 8 answers · asked by Anonymous in Biology

ok, has anyone else got this email... or is it just wondering around our family? ok, are we really going to be able to see mars tonight and is it going to be as big as the full moon to the naked eye?

2007-08-26 15:18:12 · 5 answers · asked by Anonymous in Astronomy & Space

2007-08-26 15:17:20 · 7 answers · asked by appletard 2 in Astronomy & Space

East? South? West? North?????

2007-08-26 15:13:55 · 10 answers · asked by Czan N 1 in Earth Sciences & Geology

2007-08-26 15:13:33 · 6 answers · asked by LuvDylan 5 in Weather

if it's true, then what time can you see in central time?

2007-08-26 15:09:22 · 7 answers · asked by clever_username 3 in Astronomy & Space

i live in birmingham (england) and seem to be plagued with large spiders. are you?

2007-08-26 15:07:46 · 10 answers · asked by ptrcknicol 2 in Zoology

2007-08-26 15:01:10 · 12 answers · asked by bleh 2 in Biology

Find BC

2007-08-26 14:59:55 · 4 answers · asked by Kevin P 1 in Mathematics

2007-08-26 14:56:48 · 4 answers · asked by Brittany 1 in Mathematics

Help

2007-08-26 14:55:46 · 11 answers · asked by Crazy sock puppet 1 in Geography

I wish to find the value of the infinite power tower y = x^x^x^x^x.... for x = √2. I check to see if y could be 4, so that we have

y = 4 = x^x^x^x^x... = x^y = (√2)^4 = 4

thus proving that y = 4 is the value yielded when x = √2. Can you show why this is necessarily erroneous?

If you say, "well, if I plug this into my calculator for x^x^x^x... powers", remember, you're not really computing an INFINITE power tower, but a finite one. Who says we can expect to smoothly converge to the value in the infinite case?

2007-08-26 14:51:30 · 3 answers · asked by Scythian1950 7 in Mathematics

here they are, please help with those you know. thank you soo much.

1. The sum of the first n terms of an arithmetic sequence {U sub n} is given by the formula S (sub n)= 4n^2 - 2n. Three terms of this sequence , U (sub 2) , U (sub m), U (sub 32), are consecutive terms in a geometric sequence. Find m.

2. The function f is defined for x > 2 by F(x)= ln (x) + ln (x - 2) - ln (x^2 - 4).
a) espress F(x) in the form ln [ x / (x +a) ].
b) find an expression for F^-1 (x).

please help with those you know. Thank you so much

2007-08-26 14:50:17 · 2 answers · asked by Anonymous in Mathematics

Two cars cover the same distance in a straight line. Car A covers the distance at a constant velocity. Car B starts from rest, maintains a constant acceleration, and covers the distance in the same time as car A.
Both cars cover a distance of 450 m in 220 s. Assume that they are moving in the + x direction.

(c1) What is the algebraic expression for the acceleration aB of car B? Express your answer in terms of the car's displacement L and the time t.
(c2) What is the acceleration aB of car B? Include an explicit plus or minus sign along with your numerical answer.

2007-08-26 14:48:36 · 1 answers · asked by Anonymous in Physics

Two cars cover the same distance in a straight line. Car A covers the distance at a constant velocity. Car B starts from rest, maintains a constant acceleration, and covers the distance in the same time as car A.
Both cars cover a distance of 450 m in 220 s. Assume that they are moving in the + x direction.

(a1) What is the algebraic expression for the final velocity vB of car B? Express your answer in terms of the car's displacement L and the time t.
(a2) What is the final velocity vB of car B? Include an explicit plus or minus sign along with your numerical answer.

2007-08-26 14:47:12 · 1 answers · asked by Anonymous in Physics

You have a recipe that calls for 8 cups of water. How many liters of water do you use?

I know one cup is 8 fluid ounces and 1 liter is 1.057 qts but I dont know how to put it together or if its in the problem. Can you help me step by step please?

2007-08-26 14:46:04 · 3 answers · asked by Anonymous in Mathematics

any one know how to do either of these prob?? thank you...

2. the triangle ABC has an obtuse angle at B, BC= 10.2, A=x and B=2x. (the A and B have a little curved line over them)
a) find AC in terms of cos x
b) given that the area of triangle ABC is 52.02 cos x, find angle C. ( the C has a curved line over it)

3. The position vectors of points P and Q are {2, -3, 1} and {2, 2, -4 } respectively. the origin is at O. find...
a) the angle POQ
b) the area of the triangle OPQ

please help. thanks

2007-08-26 14:43:14 · 1 answers · asked by Anonymous in Mathematics

According to the Old Farmer's Almanac, the hours of daylight in Fairbanks, Alaska, rangefrom approximately 3.5 hours in mid-December to approximately 12 hours in mid-June. Write an absolute value inequality that represents the hours of daylight in Fairbanks. <

2007-08-26 14:36:33 · 2 answers · asked by Anonymous in Mathematics