Science & Mathematics - 1 November 2007

2007-11-01 03:09:09 · 3 answers · asked by Anonymous in Mathematics

∫ tan(√x) / (x)
{tan of root x divide by x.}

2007-11-01 03:05:50 · 8 answers · asked by Anonymous in Mathematics

A recent survey found adults over 50 wear glasses. In a random sample of 50 adults over 50, what is the mean and standard deviation of the number who wear glasses?

2007-11-01 03:05:26 · 3 answers · asked by Anonymous in Mathematics

z is less than or equal to 2, given that z is less than or equal to 4.

2007-11-01 03:04:22 · 3 answers · asked by sushiis4me 2 in Mathematics

I live overseas so a tutor is pretty much out of the question for me. Can anyone recommend any good books or websites that are interesting for beginners? Thank you in advance for your help.

2007-11-01 03:01:50 · 7 answers · asked by Anonymous in Physics

The B2 Spirit, the F-117 Nighthawk, and the F-22 Raptor, are all reputed to have a radar signature of a small bird, while the F-35 Lightning II is rumoured to be virtually invisible to radar.
So, if terrestrial aircraft are this stealthy, why do flying saucers show up as HUGE radar images, particularly when the radar is passive and only responds to transponders?
If they want to be seen so badly, why do they not just land in times square.
Or if they are so careful not to be noticed, then why do they blatantly advertise themselves?
Perhaps they do not have radar where they come from.
I find it hard to believe that a civilization as advanced as they must be to have conquered interstellar distances, have not stumbled upon echo-location.

2007-11-01 02:57:37 · 4 answers · asked by Anonymous in Other - Alternative

In a machine shop with 100 automatic machining centres, a maintenance technician serves an 8 hour shift. If there is on average 12 machine breakdowns per 24 hours and if a Technician is away from the workshop 1 hour whenever he or she inspects a breakdown, how many technicians are needed on any given shift to have no more than 1% chance of a Breakdown going undetected? Assume breakdowns are detected only from the workshop

2007-11-01 02:53:24 · 1 answers · asked by aquarius16thuk 1 in Engineering

Does any one believe that 12/21/12 21st century is the end of the world?

2007-11-01 02:51:24 · 7 answers · asked by Anonymous in Mathematics

This is a general knowledge question on a parents quiz, for my kids school?

Help anyone???

2007-11-01 02:50:24 · 24 answers · asked by bakebeanie 2 in Chemistry

I found out that my dad has not been doing this. He said he takes it when his pressure is high. I want to tell him why it's important that he takes his pill every day.Can you help me to explain?

2007-11-01 02:42:52 · 4 answers · asked by audrey 1 in Medicine

And does it work please as I have severe needle phobia xxx

2007-11-01 02:41:20 · 6 answers · asked by ~♥Hunky Homer's Twin♥~ 1 in Medicine

2007-11-01 02:38:40 · 5 answers · asked by miracle2speed 1 in Botany

Or do you know anyone from the Ozarks? If so PLEASE help! I am writing a cultural resume on the Ozark region and I need information. Let my know what the lifestyle and values are like.

2007-11-01 02:37:09 · 2 answers · asked by melbosue1972 1 in Geography

When we travel by car or a bus down the ghat road or a slope bridge, we have a feeling of stomach being pulled down or a hollow effect for a moment? There must be a science behind it. Please try to answer my question or clarify this point!

2007-11-01 02:33:37 · 2 answers · asked by V. SIVAGANGAILAKSHMI 1 in Physics

2007-11-01 02:30:40 · 3 answers · asked by nicole c 1 in Chemistry

After the problems at Scaled Composites and Armadillo Aerospace, is it possible to make a go of spaceflight when disaster seems at times to be lurking around every corner?

2007-11-01 02:24:47 · 5 answers · asked by mesun1408 6 in Astronomy & Space

we have a circle with the center ( x-center , y-center ) and the radius ( r-circle ).
so how can we find the end points on this circle ( x-end , y-end ).
for example x-center = 20 , y-center = 20 , r-circle = 10 , what is the x-end and y-end. ( ( x-center , y-center ) is the central point and ( x-end , y-end ) is on of the points on circumference )

2007-11-01 02:23:38 · 3 answers · asked by Sepehr 2 in Mathematics

2007-11-01 02:16:27 · 2 answers · asked by Grinning Football plinny younger 7 in Zoology

Of the problem y=ln(cos(ln theta))

2007-11-01 02:11:32 · 2 answers · asked by The Anonymous 1 in Mathematics

2007-11-01 02:06:19 · 7 answers · asked by Anonymous in Mathematics

2007-11-01 02:06:06 · 4 answers · asked by Anonymous in Biology

2007-11-01 02:01:03 · 32 answers · asked by Anonymous in Astronomy & Space

Mars is 1.524 AU away from the sun..
I have to use formula of "d=constant/p"
Please help.. and please show me your calculation.
9 hours ago - 3 days left to answer.

2007-11-01 01:59:22 · 3 answers · asked by Anonymous in Astronomy & Space

The following paragraph was inside a news article on Yahoo today.
"Like the much larger, supermassive black holes found at galaxy centers, stellar-mass black holes have such powerful gravity fields that not even light can escape them. Astronomers estimate their mass by measuring their gas emissions and the gravitational effect on the stars they orbit."

I understand how they would have a gravitational effect on the stars they orbit and even other bodies.

But how can GAS escape if the gravitational field is so powerfull that not even light can escape?

This does not make any sense at all.

The full article can be found at

http://news.yahoo.com/s/afp/20071031/sc_afp/usastronomy2_071031201428

2007-11-01 01:57:58 · 7 answers · asked by Answerman 4 in Astronomy & Space

I recently took advantage of a local nursery's sale featuring "you pay no sales taxes".

I bought rose bulbs at $11.55/bag, and violet bulbs at $13.65/bag, as well as some gardenia at $21.45, camellia at $30.03 and japanese maple at $50.05. The final bill came to $600.92.

How many gardenia did I buy?

2007-11-01 01:56:26 · 4 answers · asked by CubeScience 3 in Mathematics

2007-11-01 01:55:38 · 3 answers · asked by joan b 1 in Chemistry

because the light seemed like it was following us. It would stay still for a few minutes and just blink its lights like crazy. then it would start moving up and down, side to side, zig zagging, very very fast! then it would move across the sky and then kind of dim out... what could this possibly be???

2007-11-01 01:48:22 · 10 answers · asked by Anonymous in Astronomy & Space

First off...I have always been told that NOTHING can escape a black hole. But, in my experience, I have found that there is usually at least one loophole, or exception to the rule, in everything.

I saw a documentary the other night on PBS about neutrino detection and learned that they were not (or hardly at all) affected by electromagnetism and gravity. And that they could travel through matter almost completely undisturbed. This got me thinking about if they could potentially escape, or at least be minimally disturbed, by black holes. Or maybe even pass straight through them completely undisturbed.

My understanding of black holes is that they have an immense gravity and nothing as of yet can be proven to escape them. But my understanding of gravity is that anything with a mass will be affected by it. So...if neutrinos have (practically) zero mass, and they have been proven to not be (practically) affected by gravity, what would happen near a black hole

2007-11-01 01:45:09 · 6 answers · asked by Toledo Engineer 6 in Physics

The solution to the equation, ln(3^x)=a , for a < 0, is:

(a) x =3a (b) x = a/ln(3) (c) 3/a (d) a/3

2007-11-01 01:29:47 · 4 answers · asked by ABD A 1 in Mathematics

2007-11-01 01:27:51 · 1 answers · asked by Pansy 4 in Medicine