Science & Mathematics - 14 February 2007

2007-02-14 02:00:08 · 8 answers · asked by sandy 1 in Mathematics

when a light travels from rarer medium to denser medium it moves towards the normal. why it moves towards the normal? i wud like to know the perfect answer pls!!
protons are present in a nucleus. both have the same charge. do they repel? if not why?

2007-02-14 01:59:52 · 2 answers · asked by nandhini 2 in Physics

2007-02-14 01:59:27 · 3 answers · asked by letadeta 1 in Mathematics

or cosmic mind? Thanks.

2007-02-14 01:56:58 · 4 answers · asked by sfumato1002 3 in Astronomy & Space

2007-02-14 01:54:25 · 6 answers · asked by mrbohn1 2 in Geography

Thanks everyone!

2007-02-14 01:53:07 · 19 answers · asked by Anonymous in Mathematics

2007-02-14 01:52:45 · 2 answers · asked by Sinthunathi 1 in Chemistry

2007-02-14 01:51:32 · 6 answers · asked by SweetStuff 2 in Other - Science

The Coriolis effect provides evidence that the Earth
1. has a magnetic field
2. has an elliptical orbit
3. revolves around the Sun
4. rotates on its axis
~~~~
The predictable changes in the direction of swing of a Foucault pendulum would be influenced most by a change in the Earth's _______?
1. rate of rotation
2 period of revolution
3angle of tilt
4intensity of insolation
~~~~~~~~
On June 21, where will the Sun appear to rise for an observer located in New York State?
1 due west
2 due east
3 north of due east
4 south of due east
~~~~~~~~
The greatest difference in seasons would occur on a planet that has __________.
1 a circular orbit
2 a slightly elliptical orbit
3 its axis of rotation perpendicular to the plane of its orbit around the Sun.
4 its axis of rotation inclined 45° to the plane of its orbit around the Sun.

2007-02-14 01:49:09 · 3 answers · asked by bananaboo517 1 in Astronomy & Space

2007-02-14 01:48:36 · 17 answers · asked by dallen3330 1 in Mathematics

2007-02-14 01:46:24 · 2 answers · asked by Anonymous in Engineering

Which observable change would occur in New York State if Earth's rate of rotation were one-half its present rate?
1. The Sun would rise in the southwest each day.
2. The length of a day would be longer.
3. The time needed to complete a cycle of Moon phases would be greater.
4. The seasonal changes would not occur.
~~~~
Which observation cannot be explained by a geocentric model?
1. Stars follow circular paths around Polaris.
2. The Sun's path through the sky is an arc.
3.A planet's apparent diameter varies.
4.A freely swinging pendulum appears to change direction
~~~~~~~~
Which statement provides evidence that Earth revolves around the Sun?
1.Winds at different latitudes are curved different amounts by the Coriolis effect.
2.Different star constellations are visible from Earth at different seasons of the year.
3.The Sun follows an apparent arc across the sky during the day.
4..The stars appear to circle Earth during the night.

2007-02-14 01:45:28 · 4 answers · asked by bananaboo517 1 in Astronomy & Space

The Amazing Randi, a renowned stage magician and, oddly enough, professional skeptic, has offered a 1 million dollar prize for anyone who can show any type of paranormal ability under verifiable conditions. The money is there, in escrow, just waiting to be claimed. I admit to being a skeptic, but I also admit that there are alot of phenomena we simply cant explain. But you would think that *one* person would have been able to do this. Are we just deluding ourselves, hoping that there is more than there really is?
http://skepdic.com/randi.html

2007-02-14 01:45:03 · 25 answers · asked by Rich F 3 in Paranormal Phenomena

My physics teacher said that some part was an "an ion" or something...
The first part of the ion "compound" is called?
The second part of the ion "compound" is called?

Thanks.

PS. It probably isn't a compound but I've forgotten the name for it!

2007-02-14 01:44:59 · 10 answers · asked by joy_hardyman2003 2 in Chemistry

2007-02-14 01:44:41 · 10 answers · asked by ? 2 in Astronomy & Space

could someone please help!?

x-4y= -4
3x+3y= -4

2007-02-14 01:44:02 · 6 answers · asked by Captain705 1 in Mathematics

2007-02-14 01:44:01 · 9 answers · asked by Anonymous in Weather

The density (Specific Gravity) is a valuable index of chemical composition of alloys. Although, one can calculate the composition of binary alloys of known metals from their densities (Specific Gravities) in straight forward manner, but for alloys having three or more constituents it leads to a mathematically untenable situation as we have more unknowns than the equations. The densities of such multi-component alloys are always associated to a large number of probable compositions. So, mathematically it is not possible to calculate all such probabilities and then to point out authentically with certainty as to which one particular composition does actually belong to the given alloy.



We are making an attempt to establish that the ‘Archimedean method’ still holds good and may be employed successfully to determine the compositions of multi-component alloys by decoding their densities into percent elemental compositions, even without prior knowledge of constituent metals. It further suggests that the densities of alloys hold the characteristic feature – the fingerprints of alloys which may be decoded for forecasting the presence of elements and their compositions in n-component alloys.



The software we have developed successfully decodes the densities of multi-component alloys into elemental percent composition without any prpor knowledge of constituent metals. It automatically detects the presence of the metals in given alloys by decoding their densities.We are making our sincere efforts to compare our theoretical data with experimental results.

May anyone help us financially or otherwise in order to complete this task?

Our findings are likely to publish in forthcoming issue of 'Material Letters' a journal of Elsevier Pblication. For more details regarding our findigs, one may visit the following link to view the abstract free of cost :



Theoretical optimisation of constitution of alloys by decoding their densities
Materials Letters, In Press, corrected Proof, Available online 7 November 2006
B.C. Rathore, Pratibha and Bharati

http://dx.doi.org/10.1016/j.matlet.2006.10.052



Your kind responses in this regard shall be highly appreciated.

Dr. B. C. Rathore

rathorebc@hotmail.com

2007-02-14 01:43:19 · 1 answers · asked by bhuvan chandra r 1 in Other - Science

It is related to the brain

2007-02-14 01:42:45 · 24 answers · asked by Simran K 1 in Biology

6: Alexander left Miami and drove at a speed of 46 mph. Thomas left 1 hour later and drove at a speed of 60 mph. How long will it take Thomas to catch up with Alexander?
Hint: since they both go the same distance, we can set their distance expressions equal for the equation.





4.29 hours
3.29 hours
5.29 hours


7: Kyle left Miami and drove at a speed of 46 mph. Eric left 1 hour and 45 minutes later (which is 1.75 hours) and drove at a speed of 62 mph. How long will it take Eric to catch up with Kyle?


Hint: since they both go the same distance, we can set their distance expressions equal for the equation.




6.78 hours
3.2 hours
5.03 hours


8: Morgan and Thomas left Seattle at three in the afternoon, traveling in opposite directions. At six p.m., they were one hundred eighty-nine kilometers apart. If Thomas' rate of speed is two times that of Morgan's, what is Morgan's speed?


Hint: you are given a total distance. Therefore, Morgan's distance expression plus Thomas's distance expression equals the total distance.




17 kph
24 kph
21 kph


9: Megan left Seattle and traveled at a rate of thirty-one kph more than two times the speed of Isaac, who left at the same time but in the opposite direction. After 1.22 hours, they were 133 kilometers apart. What was Megan's speed?

Hint: you are given a total distance. Therefore, Megan's distance expression plus Isaac's distance expression equals the total distance. This answer depends on how you rounded throughout; select the closest or ask for help.





83 kph
23 kph
26 kph

2007-02-14 01:42:41 · 3 answers · asked by me1026 1 in Mathematics

2007-02-14 01:41:39 · 4 answers · asked by DON C 1 in Zoology

Think Biology. Any ideas would be helpful. My initial response was carbon since almost everything is made of carbon.

2007-02-14 01:40:05 · 8 answers · asked by Anonymous in Biology

This is a 5th grade science project. We have googled this a bit but have come up with pretty elaborate and overwhelming projects and sites. She will be doing this on her own and suggestions for websites or materials that a 5th grader can understand and manage are appreciated.

2007-02-14 01:36:57 · 4 answers · asked by digitsis 4 in Chemistry

2007-02-14 01:32:22 · 8 answers · asked by Anurag P 1 in Chemistry

2007-02-14 01:32:18 · 2 answers · asked by raghav m 1 in Engineering

2007-02-14 01:30:59 · 7 answers · asked by ieyza 1 in Chemistry

CH3CH2CH2COHCH2CH3 +CH3CH2CH2CH2C=O H

the last reactant ends with a aldehyde, i was just not sure how to type it out. did my best.

i think the end product would be an hemiacetal because i'm adding an alchol to a aldehyde. it would be an acetal if i added an alchol to an acetal, right?

2007-02-14 01:30:34 · 2 answers · asked by Anonymous in Chemistry

We need it for our 9th grade Science class. Please help me out. Thanks :)

2007-02-14 01:29:40 · 2 answers · asked by 6 Doors Down 2 in Physics

We need it for our 9th grade Science class. Please help me out. Thanks :)

2007-02-14 01:28:42 · 3 answers · asked by 6 Doors Down 2 in Physics

hi , i waana ask a question regarding physics,how can w e recognise , there is a coolision b/w a gas molecule, why the coolision takes place, why the rreal gas get diverted , than an idreal . gas

2007-02-14 01:27:12 · 3 answers · asked by raghav m 1 in Physics