Science & Mathematics - 22 November 2007

Statement: The function f(x) = x*x (x squared) is uniformly continuous on two of the following three sets: (0,1), Z, R. Z is the set of all integers and R is the set of all real numbers.

My answer: True

2007-11-22 04:12:56 · 4 answers · asked by Gabe 3 in Mathematics

2007-11-22 04:11:49 · 27 answers · asked by Tracy Terry 2 in Astronomy & Space

2007-11-22 04:09:40 · 6 answers · asked by Tracy Terry 2 in Astronomy & Space

By using transposition, make V the subject of this formula:

X = R ( E-V ) / V

The whole formula on the right hand side R(E-V) is over the V, thankyou.

2007-11-22 04:09:36 · 4 answers · asked by riocia 1 in Mathematics

more specifically in South West London.

2007-11-22 04:04:13 · 10 answers · asked by Beautiful - 6 in Weather

Just a question that popped in my exam... Happened to be only I missed:

The sum of the potential and kinetic energies of a system is said to be conserved when

A) Only when the resultant force acting on the system is zero
B) Only when it moves in a closed cycle
C) Only when the work done by the resultant external force is zero
D) Always
E) None of the above

(or something like that)

I can't understand why A and C are wrong anyways.

2007-11-22 03:58:40 · 4 answers · asked by RenaissanT 3 in Physics

I am wanting to get my mother a telescope but I don't have that much money. So, I am having to get her one that is $100 or less. So, which one do you think is better?

http://www.amazon.com/dp/B000LJMOX6?smid=ATVPDKIKX0DER&tag=sz-ce-20&linkCode=asn

http://shopping.discovery.com/product-65618.html?tcp=Telescopes-featured-MeadeRB70R


Also, I thought if I didn't get it for her for Christmas then I could get her the one that is about $300. So, what do you think of this one?

http://www.telescope.com/control/product/~category_id=starseeker_freeship/~pcategory=starseeker_freeship/~product_id=09741

If you know of one that is better than any of these three that are $100 or less then let me know. Or, I guess if you can find one that is a really nice one that works really great then it can be $300 or less.

Well, thank you. I really appreciate it. Again, thanks.

2007-11-22 03:57:40 · 6 answers · asked by layanne1 4 in Astronomy & Space

If the weather man says that there is a 50% chance of rain and it doesn't rain, was he right or was he wrong?

I wish I could get a job like that!

2007-11-22 03:56:18 · 29 answers · asked by Picture Taker 7 in Weather

Why don't Neon lasers or helium lasers exist on their own, and instead they are combined to form He-Ne lasers?

2007-11-22 03:56:04 · 1 answers · asked by Kush 2 in Physics

2007-11-22 03:55:23 · 4 answers · asked by Tracy Terry 2 in Astronomy & Space

Consider the following balanced equation in which gas X forms gas X2.

2X(g) --> X2 (g)

Equal moles of X are placed in two seperate containers. One container is rigid so the colume cannot change; the other container is flexible so the volume changes to keep the internal pressure equal to the external pressure. The above reaction is run each container. What happens to the pressure and density of the gas inside each container as reactants are converted to products?



Detailed Please ! =]
Thanksss !

2007-11-22 03:54:18 · 1 answers · asked by Anonymous in Chemistry

I could use some help using the subitution method to solve this problem.
4x+5y+-1=-12+2x
x-3y+2=-3-x

2007-11-22 03:45:26 · 8 answers · asked by Adventurebound75 1 in Mathematics

Tom Hanks, the navigator of a ship at sea, spots two lighthouses that he knows to be 2 miles apart along a straight shoreline. He determines that the angles formed between two line-of-sight observations of the lighthouse and the line from the ship directly to shore are 12º and 30º.
(a) How far is the ship from lighthouse A?
(b) How far is the ship from lighthouse B?
(c) How far is the ship from shore?

I'll try to draw a little illustration... \ is 12º, | is ship from shore straight away, and / is 30º
A -------2miles--------B
\| /
\| /
\| /
\| /
\ | /
\ | /
\12º | 30º/
\ BOAT /

This answer was correct, but it doesn't logically make sense to me.
sin 42º = sin 60º
2 miles x
x = 2.588 miles (a)

then I found b = 2.923 miles
and c = 2.534 miles
The #'s that I'm using don't logically match up with the picture though...

2007-11-22 03:45:26 · 1 answers · asked by Ti-Mon 2 in Mathematics

2007-11-22 03:41:17 · 6 answers · asked by Jack 5 in Biology

what would an alien think of earth if they came over here

2007-11-22 03:36:32 · 5 answers · asked by sweety6751 1 in Astronomy & Space

Prove that 3|n(2n²+1)

Prove that 3 is divider of n(2n²+1)

2007-11-22 03:34:36 · 4 answers · asked by Anonymous in Mathematics

A moving object has a kinetic energy of 182 J and a momentum with magnitude of 28.2 kg·m/s.
(a) Determine the mass of the object.
(b) Determine the speed of the object.

2007-11-22 03:29:49 · 3 answers · asked by andyjumpman23 3 in Physics

2007-11-22 03:28:59 · 11 answers · asked by Autumn 1 in Astronomy & Space

bonus question explain how you woul measure 1 gram of water

2007-11-22 03:28:18 · 2 answers · asked by aj mc cake 1 in Physics

A 0.220 kg block on a vertical spring with spring constant of 4.20*10^3 N/m is pushed downward, compressing the spring 0.053 m. When released, the block leaves the spring and travels upward vertically. How high does it rise above the point of release?

2007-11-22 03:25:14 · 2 answers · asked by andyjumpman23 3 in Physics

2007-11-22 03:16:04 · 8 answers · asked by maria s 1 in Earth Sciences & Geology

Hi I want to write a report of about 1000 words on students misconceptions on the topic of forces for KS3 physics - children aged 11-16.

So was wondering if you could offer misconceptions regarding forces for children this age that I can add to my list that I am compiling.

thanks

2007-11-22 03:15:15 · 6 answers · asked by Anonymous in Physics

Tanya carried out an experiment in which she placed some iron wool into some blue copper sulphate solution.
In her book she wrote:
"I predict that the iron will react with the copper sulphate because iron is higher than copper in the reactivity series. I think that i will see some colour changes"

1) Describe the two colour changes Tanya would see that would show her prediction is correct.

2) Complete this word equation for the reaction:
iron + copper sulphate =

3) Tanya then repeated the experiment with zinc in place of iron. Compare the result you would expect to the result for iron.

All answers and explanations are much appreciated. Thanks

2007-11-22 03:14:42 · 1 answers · asked by Anonymous in Chemistry

Here it's cold and misty, with snow and slush on the ground and rain coming down periodically.

2007-11-22 03:12:36 · 18 answers · asked by Anonymous in Weather

Let f: (a,b) --> R (the set of real numbers) be a differentiable function at x belongs to (a,b). Prove that the limit as h goes to zero of [f(x+h)-f(x-h)]/h exists and is equal to f ' (x). Is the converse statement true?

2007-11-22 03:10:28 · 3 answers · asked by Gabe 3 in Mathematics

five people get on, then one changes her mind and gets back off. At the last stop, seven people and a goose get on, one person gets off...

What is the driver's name?

2007-11-22 03:07:38 · 3 answers · asked by Anonymous in Other - Science

Has there been any confirmed or disproved findings concerning any possible ill effects on developing fetuses associated with pregnant mothers consuming any artificial sweeteners? Has there been a study conducted to evaluate whether a link between autism and artificial sweeteners exists? Or are there statistical graphs that chart any potential correlation with the increased overall consumption of artificial sweeteners with the increase of birth defects or abnormalities?

2007-11-22 03:05:28 · 4 answers · asked by YahooAnswers 5 in Medicine

please show me how it would be done in an exam. thanks alot

2007-11-22 03:01:33 · 4 answers · asked by mhthekidd 2 in Mathematics

I know that the determinant of ((lambda)(I)-(A) has to be zero, but what about det (A)? Does it have to be zero as well?

2007-11-22 03:00:39 · 3 answers · asked by invincibleian 1 in Mathematics

bonus question how many ml are in 5cm3

2007-11-22 03:00:28 · 3 answers · asked by aj mc cake 1 in Mathematics