Science & Mathematics - 23 September 2007

let V be a vector space and let A be any subset V. there exists linear subspaces of V that contain A (for instance, V itself is such a subspace) let n = (N: N is a linear subspace of V containing A) show that n contains a smallest element. (try intersection of n) thus, there exists a smallest linear subspace of V containing A

i cant get it, please help,

2007-09-23 12:42:24 · 1 answers · asked by Anonymous in Mathematics

Problem:

g(x)=abs(2x-8)+1


abs means the absolute value.

2007-09-23 12:41:05 · 2 answers · asked by Azumi 2 in Mathematics

2007-09-23 12:40:11 · 2 answers · asked by hntersmom 2 in Earth Sciences & Geology

Tension in a string from which a 4.3 kg object is suspened in an elevator is equal to 45N.

What is the magnitude of the acceleration of the elevator?
What is its direction? (I don't know how I would go about answering this question)


m=4.3kg
T=45N
g=-9.8

F=ma=T-mg
a=T-mg/m
a=(45-42.14)/4.3
a=.66512 m/s^2

IS this correct??

2007-09-23 12:39:06 · 1 answers · asked by ? 1 in Physics

if , instead of letting the ball on the end swing and hit the others, someone shot the end ball of a stationary newton's cradle[those things ,sometimes as toys, with hanging metal balls in a row]how [assume without destroying it]would it behave?

2007-09-23 12:35:52 · 1 answers · asked by Anonymous in Physics

You're 5.0from one wall of a house. You want to toss a ball to your friend who is 5.0 fromthe opposite wall. the throw and catch each occur 1m above the groiund.
a. what minimum speed will allow the ball to clear the roof
b. at what angle should you toss the ball.

2007-09-23 12:33:55 · 1 answers · asked by vadawa13 3 in Physics

for example

3x+4x=14

how do u insert the small x's?? or is there any alternative to this?

2007-09-23 12:30:12 · 2 answers · asked by Anonymous in Mathematics

2007-09-23 12:27:13 · 3 answers · asked by Andre R. 1 in Other - Science

Is the cell wall or cell membrane on the outside of the plant cell?? Like if a cell was a cake, would the frosting be the cell membrane or cell wall??

2007-09-23 12:26:31 · 3 answers · asked by Liss 2 in Biology

2007-09-23 12:25:40 · 7 answers · asked by naz 1 in Engineering

When using a cladistic approach to systematics, which of the following is considered most important for classification?

A. shared primitive characters

B. analogous primitive characters

C. shared derived characters

D. the degree of evolutionary divergence
E. overall phenotypic similarity

I'm not sure if this should be A or C. I am leaning towards C, because these characters are unique to a particular clade and would seem to be better for classifying.

2007-09-23 12:24:29 · 1 answers · asked by Anonymous in Biology

the lean of the tower was a problem, the people of pisa decided to solve it by curving the tower...What Solutions can u think of??

2007-09-23 12:22:52 · 1 answers · asked by Anonymous in Engineering

The height above ground of a toy rocket launched upward from the top of a building is given by s(t)=(-16t^2)+96t+256.

a) What is the height of the building?
b) What is the maximum height attained by the rocket?
c)Find the time when the rocket strikes the ground.

* Pls include all steps.

2007-09-23 12:19:35 · 1 answers · asked by Anonymous in Mathematics

let V be a vector space and let m be any set of linear subspaces of V. let A be the union of the subspaces in m, that is, A = U m = (x e V: xeM for some M e m)
e=element of

show that there exists a smallest linear subspace of V that contains every M e m

tough isnt it!

2007-09-23 12:15:16 · 2 answers · asked by Anonymous in Mathematics

Find the equation of the tangent line to the graph of f at the indicated point. f(X)=1/3X times SQUARE ROOT OF (x^2+5)

Point is (2,2)

Just to make it clear
X is a variable
x^2+5 is in the square root

My answer I recieved it (1/3)x^2/(x^2+5)^(1/2)
I haven't plugged in the points yet. So don't worry about that.

2007-09-23 12:12:43 · 3 answers · asked by Phil 2 in Mathematics

Will the oceans dry up?

2007-09-23 12:12:20 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-09-23 12:11:53 · 9 answers · asked by Anonymous in Mathematics

2007-09-23 12:11:13 · 1 answers · asked by Araceli F 1 in Botany

doing a poem due tomorrow and its about a sunflower growing...i need to make it as concrete as possible(appeals to senses: sight smell sound touch taste). could u help me out here?

2007-09-23 12:06:08 · 1 answers · asked by thelovelyfey 2 in Botany

I understand the frame dragging of a spinning Black Hole caused by the warping of time and space. Once the Schwarzschild radius has been reached is time actually moving backward? I understand that it's theoretically possible to move forward in time but I thought moving backward was deemed an impossibility.

2007-09-23 12:04:15 · 5 answers · asked by Spade, Sam Spade 6 in Astronomy & Space

2007-09-23 12:02:29 · 9 answers · asked by Anonymous in Paranormal Phenomena

2007-09-23 12:00:52 · 2 answers · asked by w_rayas07 1 in Engineering

if it is please tell me

2007-09-23 11:54:52 · 4 answers · asked by Anonymous in Mathematics

ok i know wat it does but wat does it do???

2007-09-23 11:54:34 · 3 answers · asked by Anonymous in Botany

I have been on depression medication for about 3 months now. The medication I am on is called Cipralex. I was REALLY happy for the last 2 weeks but I wanted to know if I was NATURALLY happy (like if I have overcome depression) or if it was the medication. So I didn't take it for 2 days and I just died! I had nausea, headaches, diarrhea, and I was so depressed. What is wrong with me? Am I addicted to the drug or am I just depressed still?

2007-09-23 11:51:11 · 4 answers · asked by Tim Buck 5 in Medicine

write the augmented matrix of each system of equations

{4x1 - x2 + 2x3 - x4 = 4
{ x1 + x2 + 6 = 0
{ 2x2 - x3 -4x4 = 5

can explain this numbers behind x's are small i couldn't figure out how you make them small?

2007-09-23 11:50:15 · 6 answers · asked by w s 3 in Mathematics

2007-09-23 11:50:04 · 9 answers · asked by babby_bear30_99 1 in Mathematics

Barney Wilson is receiving allopurinol 0.45 2 times a day for treatment of his gout. The drug is available in 300 mg scored tablets. Your should administer_________tablets per dose.

Your help is appreciated

Have a wonderful day!

2007-09-23 11:50:01 · 6 answers · asked by tickled pink 1 in Medicine

solve the system for a,b,and c and write an qeuation for the parabola.

please help me on how to figure out a problem like this!!

2007-09-23 11:49:20 · 1 answers · asked by Joe 1 in Mathematics

2007-09-23 11:46:12 · 1 answers · asked by jojo 1 in Other - Science