Science & Mathematics - 17 November 2007

2007-11-17 18:21:31 · 3 answers · asked by Lara J 1 in Chemistry

The Moon is orbiting earth because of earth's gravity just like earth orbits the sun but why does it stay at a distance?? Why doesn't Gravity pull the moon towards us??

2007-11-17 18:03:42 · 7 answers · asked by Anonymous in Astronomy & Space

Year......Population
1750.....790
1800.....980
1850.....1260
1900.....1650
1950.....2560
2000.....6080

a) Use the exponential model and the population figures for 1750 and 1800 to predict the world population in 1900 and 1950. Compare with actual figures.

b) Use the exponential model and the population figures for 1850 and 1900 to predict the world population in 1950. Compare w/ actual figures.

c) Use the exponential model and the population figures for 1900 and 1950 to predict the world population in 2000. Compare with the actual population and try to explain the discrepancy.

2007-11-17 18:01:13 · 7 answers · asked by Anonymous in Mathematics

2007-11-17 17:56:09 · 5 answers · asked by +-+-+-+-+- 4 in Astronomy & Space

How do I simplify

ln [square root[(x-1) / ((square root)(x+1))]]


Also how to simplify

ln [(x^x+1 / (1-x^3)) * (2^x / 7x)]

2007-11-17 17:50:22 · 6 answers · asked by Anonymous in Mathematics

2007-11-17 17:31:20 · 2 answers · asked by Tung P 2 in Mathematics

This is the only time I have ever taken adderall so there is no "build-up" It was a 7.5 because I split a 15 mg in half and only took the one half. Thanks.

2007-11-17 17:26:41 · 0 answers · asked by Anonymous in Medicine

What can you do with energy?

2007-11-17 17:13:30 · 4 answers · asked by Anonymous in Physics

please help me with this..
i search a lot of sites, but mostly all the same.
thanks

2007-11-17 17:05:00 · 5 answers · asked by sweetheart93 2 in Other - Science

details like their mission names, launch/arrival years, target planets n stuff

2007-11-17 17:03:06 · 2 answers · asked by Boosy 1 in Astronomy & Space

What did they do to you?

2007-11-17 17:00:02 · 17 answers · asked by Anonymous in Astronomy & Space

1 What is the surface area of the figure?
(If necessary, round your answer to two places after the decimal point. Use meters for your answer--but do not write units in your answer.)
https://ecot.iqity.net/clsresshr/class.com/ewew_content/prealg1b/exammedia/020314.gif

i have no idea how to do that.

2 What is the surface area of the figure?

(If necessary, round your answer to two places after the decimal point. Use meters for your answer--but do not write units in your answer. Use 3.14 as your value for pi.)

https://ecot.iqity.net/clsresshr/class.com/ewew_content/prealg1b/exammedia/020312.gif

and how to find the volume of them too! does anyone care to explain :( 10 points for you :( c'mon. pweez.
PLEASE DO NOT JUST GIVE ME THE ANSWER. as helpful as it may seem, i would rather know how to do it than just pass the test!

2007-11-17 16:59:14 · 2 answers · asked by ehh 2 in Mathematics

of the product jn is 9, what is the units digit of k ?

2007-11-17 16:59:14 · 5 answers · asked by Anonymous in Mathematics

2007-11-17 16:54:52 · 4 answers · asked by Andrew R 1 in Weather

Find the probability. Probability is the number of desired outcomes divided by the total possible cases. Find these parts seperately.

2007-11-17 16:54:39 · 2 answers · asked by petrified005 1 in Mathematics

2007-11-17 16:53:09 · 10 answers · asked by Anonymous in Earth Sciences & Geology

I mean if global warming is causing floods and stuff, why would there will be water shortages? I mean wouldn't it be a good thing if there were water all around us, and we could use that to make it clean and give people. In africa and stuff? So why would there be water shortages? Sorry, but I just wanted to know and I don't know much about climate stuff.

2007-11-17 16:52:01 · 20 answers · asked by maaamaaamia 1 in Earth Sciences & Geology

Last summer my firend and I were on a porch and she was like convered in mosquitos and the were buzzing around me but leaving me alone. I didnt use any repellent

2007-11-17 16:48:33 · 22 answers · asked by MaterialMu$e 3 in Zoology

does drift mean wind?

2007-11-17 16:44:31 · 7 answers · asked by Anonymous in Earth Sciences & Geology

This is a question of space science, regarding certain materials that have either been tested in space, or theorized to last an unestimable period of time.

Is there any kind of material which, if crafted into an orbital space station, would be durable enough to last for millions of years without regular maintenance?

On Earth, there are so many other factors that do not exist in space. There considerations for such things as gravity, dust, microorganisms, erosion and chemical weathering, physical impact and destruction. In space, these factors are cut completely out almost. Is it possible to build a spacecraft that could exist by itself in space, unmanned, for millions of years without ever fracturing? Could the craft remain durable and functional over millions of years, without any period maintenance?

2007-11-17 16:43:09 · 5 answers · asked by Brett Y 1 in Astronomy & Space

this is about the skeletal system of a human.

2007-11-17 16:40:02 · 4 answers · asked by rose 2 in Biology

the information content of a bit pattern is 1010101010101011. Using an even parity scheme algorithm, derive the value of the checksum field of a two-dimentional parity scheme. Minimum-length checksum field should be use. two-dimensional parity checks can correct and detect? can a double-bit error be detected and corrected?

2007-11-17 16:38:58 · 2 answers · asked by Anonymous in Mathematics

I asked this question last night and got an answer. The answer is totally appreciated, but my gut feel is there is something mathematically wrong here... I was expecting the wind speed to be upwards of 40km/hr, not .7km/hr. Would someone be able to review the math used in the answer? Thank you kindly.

The Original Question...

Convert CFM to KMPH?
ok... I have a fan with a 36" diam capable of moving 10,354cfm. The fan is mounted in a round tube that tapers down to a 2'X2' square tube. Through the 2' x 2' section of tube, approximately what sort of wind speed can I expect? Also, can you provide a formula that can help me calculate this for different CFM values.

The Answer I got...

2' x 2' = 4 square foot cross section
10354 ft3/min / 4 ft2 = 2588.5 ft/min
2588.5 ft/min * 0.000305 km/ft = 0.7894925 km/hr

This, of course, asuumes 100% efficiency. I hope this helps you.

2007-11-17 16:33:44 · 4 answers · asked by seanb_111 1 in Engineering

2007-11-17 16:31:06 · 2 answers · asked by JO 1 in Medicine

2007-11-17 16:29:18 · 33 answers · asked by Anonymous in Astronomy & Space

2007-11-17 16:24:21 · 12 answers · asked by iluvorlando95 2 in Mathematics

I used to completely believe in the afterlife but now I don't know anymore. My mom (who is dead) never left me any signs or anything to prove that she is still here. So if you have, please share your experiences. Thanks.

2007-11-17 16:14:54 · 47 answers · asked by Anonymous in Paranormal Phenomena

Lee is rolling along her 4 kg skateboard with a constant speed of 3 m/s when she jumps off the back and continues forward with a velocity of 2 m/s relative to the ground. This causes the skateboard to go flying forward with a speed of 15.5 m/s relative to the ground. What is Lee's mass?

2007-11-17 16:13:11 · 3 answers · asked by Light Up the Sky 1 in Physics

Valentina, the Russian Cosmonaut, goes outside her ship for a spacewalk, but when she is floating 15 m fro her ship, her tether catches on a sharp piece of metal and is severed. Valentina tosses her 2 kg camera away from the spaceship with a speed of 12 m/s

How fast will Valentina, whose mass is now 68 kg, travel toward the spaceship?

Assuming the spaceship remains at rest with respect to Valentina, how long will it taker her to reach the ship?

2007-11-17 16:11:56 · 1 answers · asked by Light Up the Sky 1 in Physics

Anthony and Sissy are in a rollerskating dance championship. While 75 kg Anthony rollerskates backwards at 3.0 m/s, 60 kg Sissy jumps into his arms with a velocity of 5 m/s in the same direction.

How fast does the pair roll backwards together?

If Anthony is skating toward Sissy when she jumps, could their combined final velocity be larger or smaller than your answer to part a? Why? show calculations

Thanks in advance!

2007-11-17 16:09:56 · 1 answers · asked by Light Up the Sky 1 in Physics