Science & Mathematics - 23 August 2007

This is a serious question. Excel only works to 30 decimal places. But is there a way to work it out without actually working it out, ie. can you simply tell how many decimal places it would be by looking at the power its raised to?

2007-08-23 21:07:01 · 7 answers · asked by boyinlove2k 2 in Mathematics

If my antenna is connected to ground through a 50 Ohm resistor, or smaller, it's okay for reception still?

2007-08-23 21:01:27 · 4 answers · asked by rusty 3 in Engineering

1) simplify the expression tan^2x - 2tanx+1/1+tan(-x)

2) use an identity to find the exact value of tan(pi/3+pi/4)

2007-08-23 21:00:31 · 2 answers · asked by BaleriaBaleyva<33 2 in Mathematics

2007-08-23 20:56:04 · 2 answers · asked by quizzical 1 in Mathematics

I spent FOREVER trying to figure out how to find the perfect square of an ellipse equation, AND I FINALLY FIGURED IT OUT! I was sooo excited. Then I looked at the original question: Find the center of the ellipse with the equation 3x^2+4y^2+18x-32y-5=0

I completed the square, and got (x+3)^2 OVER 32 + (y-4)^2 OVER 24 =1


you can obviously replace "OVER" with a fraction sign, I just had to do that so it didn't look like it was 2/32 or 2/24 or anything like that, so I hope it made sense!

My book says that the standard form of the equation of the ellipse is x^2/b^2+y^2/a^2=1, then it says b^2=a^2-c^2

I was thinking I could make my equation look like that by just finding the square roots of 32 and 24, but I thought about it, and they're not perfect squares, so they come out as really random numbers, so I'm guessing that's not what I'm supposed to do??

How do I find the center of this ellipse?! I've spent SO LONG on this problem it's frustrating me!!!!

THANKS!

2007-08-23 20:55:33 · 1 answers · asked by jamie68117 3 in Mathematics

can it be possible?this technology is an example of Alternative
in Science?
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http://vortexscience.com/
http://jnaudin.free.fr/html/vtxtech.htm
http://homepage.ntlworld.com/ufophysics/index.html

2007-08-23 20:51:44 · 3 answers · asked by kokopelli 6 in Paranormal Phenomena

imagine theres a horizontal planeA bove which the effects of gravity are not felt. any object above the plane just floats and gravity has no influence on it.
now take a chain(for e.g:made of small steel ring) of length hundred metres above the planeA and arrange it so that its in a heap just above the planeA. but take care the chain is not entangled and should be easy to stretch along its length.

now pull the lower end of the thread below the planeA and the chain runs down like a single thread and hits the ground and as links pull down on the ones they are linked to , the whole length of the chain will run like a thread and hit the ground in some time. now take planeA is 20metres above the ground surface. the terminal velocity of links when they hit ground will be around 14 metres .
now consider hundred metres of the chain weighs 100 units. the potential energy of the chain just above the planeA will be m*g*h =100 *9.8*20
=19600 units.

2007-08-23 20:47:11 · 2 answers · asked by balaji.k 2 in Physics

2007-08-23 20:44:45 · 5 answers · asked by Lina J 2 in Chemistry

2007-08-23 20:44:15 · 5 answers · asked by Lina J 2 in Chemistry

2007-08-23 20:43:38 · 4 answers · asked by Lina J 2 in Chemistry

2007-08-23 20:37:36 · 4 answers · asked by marie c 1 in Medicine

I am very interested in finding theconditions – if such conditions ever exist – that (ab)² + (ac)² + (bc)² is a perfect square.

Please help. Thanks!

2007-08-23 20:31:56 · 5 answers · asked by John J 1 in Mathematics

2007-08-23 20:24:57 · 5 answers · asked by Adawg 3 in Chemistry

2007-08-23 20:16:40 · 4 answers · asked by Anonymous in Mathematics

does this sound correct?
4 years of college
4 years of med school
3 years of internship/residency.
so 11 yrs. total and u can start making the dough.
also, how much does a General pediatrician make?

2007-08-23 20:08:46 · 6 answers · asked by Tyler 2 in Medicine

2007-08-23 20:05:34 · 2 answers · asked by ANIL E 1 in Engineering

what are the differences between constant voltage and constant current power supply?
i really have doubt about constant current power supply, as i know current produced in a circuit may be varied according to it's load. somebody can help me??

2007-08-23 20:04:51 · 11 answers · asked by A learner 1 in Engineering

Cathodic protection of steel water tank

What are the best materials could be used for cathodic protection of a water tank made of St-37 ( 2000 liters, 4mm thickness) ? Could it be protected using a single place for the cathode with multi wire connections? Should the cathodic cavity whch contains cathodic materials isolated? And what are the design concepts to design this system.

2007-08-23 20:02:52 · 2 answers · asked by Anonymous in Engineering

2007-08-23 19:53:46 · 1 answers · asked by elina 2 in Mathematics

2007-08-23 19:49:08 · 2 answers · asked by Anonymous in Geography

2007-08-23 19:47:22 · 1 answers · asked by Lorenzo H 3 in Geography

Solve for x.

2007-08-23 19:47:08 · 4 answers · asked by Anonymous in Mathematics

I have confusion over "molecular partition function" and the "parttion site" (a phrase used in acclerys"). I need clarification. Where can I get information in this regard?

2007-08-23 19:45:36 · 1 answers · asked by The Knowledge Server 1 in Chemistry

2007-08-23 19:32:27 · 2 answers · asked by peanut m 1 in Astronomy & Space

Help me with this...?
a ballA of mass 1 units travelling at velocity of 2 units collides with a ballB of mass 1.2 units which is at rest. take the collision as head on and perfectly elastic. now can u please find the velocities of the balls after the collision using law of cons of momentum...?

2007-08-23 19:29:51 · 2 answers · asked by mikel 2 in Physics

i want to know abt the practical work and all othr data....

2007-08-23 19:27:40 · 5 answers · asked by Anonymous in Chemistry

I would like to connect Line Out / Earphone to my Recording Device that only has Mic In and no Line In

Basically I just have to convert Line Out signal which is around 500mV, to Mic In which is around 2mV.

How do I do this, I just put a resistor between two connection. If so, how many do I need and how much?

2007-08-23 19:13:33 · 0 answers · asked by Anonymous in Engineering

2007-08-23 19:05:41 · 5 answers · asked by jayendra 1 in Earth Sciences & Geology

2007-08-23 19:03:02 · 11 answers · asked by Moses 1 in Astronomy & Space

2007-08-23 19:02:52 · 5 answers · asked by ectrip78 1 in Mathematics