Science & Mathematics - 16 October 2007

find a formula for T(n)the general term for 3,2.8,2.6,2.4,2.2


i dont want to look a complete fool if he asks me how to solve this can someone help me please ?

2007-10-16 06:22:08 · 21 answers · asked by elite 3 in Mathematics

1)find the lengths of the tangents from point (3,4) to the circle x^2 +y^2 = 4

i think the answer is sqrt 21 not sure on working though


2) find the lengths of the tangents from point (5,7) to the circle x^2 + y^2 - 2x - 4y - 4 = 0

i think the answer is 4 sqrt 2 not sure on working again though

2007-10-16 06:21:53 · 2 answers · asked by Anonymous in Mathematics

astronauts in an orbiting spacecraft are said to be weightless, but obviously there is force due to gravity on them. How do they stay in orbit and avoid falling, or are they falling?

2007-10-16 06:12:02 · 9 answers · asked by purple_peaches_06 2 in Astronomy & Space

Often times in my life if I imagine something happening it happens. This is a perfect example and this kind of stuff happens ALLL the time...Last Night I was going downstairs to use the bathroom and when I turned the basement light on it flickered for a long time like a strobe light and it sort of freaked me out...I thought for a minute Oh Great, the Poltergeist are back (Because I am often haunted by poltergeist, shadow people, etc) But, I was sitting in the bathroom (sorry) and my daughters bedroom door is right next to the bathroom, I heard her in there singing and was going to tease her about singing herself to sleep. Decided not to. Then when I was on my way upstairs I was thinking again, what if there's something down there, what if it did something and scared her. Then a few minutes later she came upstairs and said something locked her door (which was not all the way closed when i was down there) and she felt pricklies and a hand on her arm. This ALWAYS HAPPENS!

2007-10-16 06:11:01 · 16 answers · asked by Anonymous in Paranormal Phenomena

2007-10-16 06:04:58 · 17 answers · asked by krishna_leelakrishna 2 in Physics

I am soooo lost Please help!!!...This is a system of equations with 3 variables.
4x + 3z =4
2y - 6z =-1
3x +4y 3z =9
I have the answers just can't figure out how they got there.
(3/4,1/2,1/3)

2007-10-16 05:55:36 · 5 answers · asked by calired67 4 in Mathematics

My doctor told me to take 12 tablets of Prednisone all together in one time!!!!! Is that okay..

2007-10-16 05:55:22 · 5 answers · asked by Anonymous in Medicine

AM, FM, Shortwave , Long Wave, Sideband??

2007-10-16 05:54:53 · 5 answers · asked by I B 1 in Paranormal Phenomena

is there any website to show when is the next shooting stat coming??? realy want to see... thanks.
from vancouver

2007-10-16 05:54:20 · 8 answers · asked by tete0918 1 in Astronomy & Space

On the ph scale there is acids and bases so why is water in the middle and neutral other than the obvious answer that it is neither an acid or a base.

2007-10-16 05:49:45 · 7 answers · asked by Anonymous in Chemistry

and see a good picture of how they look like??

2007-10-16 05:48:22 · 3 answers · asked by Anonymous in Astronomy & Space

If you could , would you pilot into the center of a black hole?
What do think you would find if you did?

2007-10-16 05:47:00 · 11 answers · asked by LOST IN SPACE 1 in Astronomy & Space

plzzz help mee, i dnt get it

tanx

2007-10-16 05:43:37 · 6 answers · asked by -x-lollie-x- 1 in Mathematics

Prove this identity:

tan^2(α)-sin^2(α)=sin^2(α)*tan^2(α)

*this is not tan^2α,this is tan(α)*tan(α)

2007-10-16 05:43:23 · 3 answers · asked by Amir B 1 in Mathematics

2007-10-16 05:39:19 · 12 answers · asked by Anonymous in Mathematics

What is the least number of people that could be represented by each percentage. Remember, there is no such thing as a "part of a person" in this exercise. The person is alive and whole.
#1. 27.85%
#2. 26.58%
#3. 17.72%
#4. 12.03%
#5. 7.59%
#6. 8.23%

The percentages add up to 100%. The population number is not known by me. I do not have the answer. I am looking to have somebody who understands math to explain how this problem is to be solved and to provide the solution.

2007-10-16 05:38:10 · 5 answers · asked by old nuff 2 B yer grandpa 2 in Mathematics

2007-10-16 05:37:12 · 9 answers · asked by Anonymous in Mathematics

This is to find resistivity of constantan. Can anyone tell me where i am going wrong.

Done the experiment at college today.
R=pl/a
p=rl/a so to put my figures in resistance =0.03 per cm cross sectional area = 0.167mm(sq.) and my results are just no where near Constantan (Eureka) 49 × 10-8
Please help is this just error or am i just not getting something.

2007-10-16 05:37:02 · 4 answers · asked by master 2 in Physics

2- If there is only a peak in the voltage (without any
reputation in time) , is it possible to filter it by
one RC circuit ? if yes how ? how could we define the
frequency in this case ?

2007-10-16 05:36:02 · 4 answers · asked by Anonymous in Physics

2007-10-16 05:33:48 · 7 answers · asked by Anonymous in Astronomy & Space

1 herbivores
2 filter feeders
3 carnivores
4 omnivores

2007-10-16 05:33:02 · 6 answers · asked by deji a 1 in Biology

1 glycerols
2 monosaccharides
3 fatty acids
4 amino acids

2007-10-16 05:32:21 · 6 answers · asked by deji a 1 in Biology

decide whether the discovery should be considered reasonable or surprising.

A solar system has several planets similar in composition to the jovian planets of our solar system but similar in mass to the terrestrial planets of our solar system.

2007-10-16 05:30:53 · 11 answers · asked by bromine 1 in Astronomy & Space

1 monosaccharides
2 glycerols
3 fatty acids
4 amino acids

2007-10-16 05:30:50 · 5 answers · asked by deji a 1 in Chemistry

2007-10-16 05:30:35 · 11 answers · asked by dont sip on haterade 3 in Astronomy & Space

1. Show that the equation ax^2 + (a + b) + b = 0 has real roots for all the values of a and b.

2. Find the coordinates of the point that divides the line joining L(-3,-4) to M(3,5) externally in the ratio 3:1

2007-10-16 05:27:37 · 4 answers · asked by polol 2 in Mathematics

Find the equation of the line passing through the point B(1,-3,0) and perpindiculat to the plane x + 2y - z = 10

Show me the correct answer and your work for best answer. Thanks

2007-10-16 05:21:26 · 2 answers · asked by bob b 1 in Mathematics

What part of an elephants body almost takes up 1/3 of their weight? I'm stuck between their fat, bone, or tusks. Any help is greatly appreciated.

2007-10-16 05:15:22 · 1 answers · asked by Mike H 2 in Zoology

A 300 turn coil area of 25 cm^2 is placed in an 80 mT magnetic field. If the coil carries a current of 3.3 A, what is the magnitude of the maximum magnetic torque it could experience?

a) 20 N*m
b) 6.0 N*m
c) 0.13 N*m
d) 0.20 N*m
e) 0.060 N*m

please help

2007-10-16 05:09:39 · 2 answers · asked by Anonymous in Physics

A velocity selector for ions uses perpendicular electric and magnetic fields. If the electric field used were 800 V/m, what magnetic field would allow the selection of a velocity of 4000 m/s??

a) 0.040 T
b) 0.080 T
c) 0.16 T
d) 0.20 T
e) 0.50 T

2007-10-16 05:06:57 · 2 answers · asked by Anonymous in Physics