Science & Mathematics - 13 December 2007

I'm about ready to get a 10 inch scope, and I am fond of Nebulas. So.. I'd be pretty cool to know.

What are the most enjoyable to observe?

Thanks.

2007-12-13 03:32:11 · 5 answers · asked by Jansen J 4 in Astronomy & Space

i need dis answer a.s.a.p thanks

2007-12-13 03:31:35 · 3 answers · asked by j.o.b killa 1 in Biology

I know the classic definition, but can somebody give me a real-life application of the principle. Thanx!

2007-12-13 03:28:55 · 3 answers · asked by Anonymous in Physics

So what is the possible effect in our lives or in our environment?

2007-12-13 03:26:53 · 3 answers · asked by Jeff 1 in Chemistry

2007-12-13 03:25:28 · 2 answers · asked by Chris G 1 in Chemistry

2007-12-13 03:24:46 · 4 answers · asked by Tara x0x 1 in Weather

Ok i am really confused on these questions. Please help Best answer obviously gets the 10 points!!!!

25: Cans of dog food hold 3/4 lb. per can. How many cans can be filled with 6 lb. of dog food?
18
4
8
16


26: One can of concentrated orange juice makes 3/8 gal of juice when mixed with water. How many cans are needed to make 24 gal of juice?
30
25
64
49


27: A movie theater seats 324 people. If the theater is currently 2/3 full, how many people are in the theater?
216
268
603
252


28: A stock was listed at 32 and 1/4 points and fell 3/4 point during the week. What was its ending value?
31 1/2 pts
31 7/8 pts
32 2/3 pts
32 1/2 pts


29: Andrea biked 1 and 2/3 mi, then turned around to go home. After pedaling for 3/5 mi, how far was she from home?
11/15 mi
2 5/12 mi
1 1/15 mi
1 1/4 mi


30: Sandra drove for 5 and 3/10 mi to a city park, then she headed back home. After driving 1 and 1/5 mi on her way, how far was she from home?

2007-12-13 03:22:33 · 4 answers · asked by Anonymous in Mathematics

Alright, just had my Calc II final today, and there were two questions I wasn't too sure of.

The first: ∫ ln(x)/(x^(1/2)) on the interval of 0 to 1 - does it converge? I'm fairly certain that l'hopitals' doesn't work here, as plugging in 0 would give negative infinity over 0. If it does converge, the definite integral should be around -4 if I did my math correctly.

The second problem: does the sequence (1 + 3/n)^2n converge? If so, what value does it converge to? I wasn't sure how to approach this one, though I figured that the number in the parenthesis is always going to be > 1, therefore raising it to an increasing power will give a number that doesn't converge...although as the sequence continues on it will head towards 1... heh I think I might have answered my own question there, I must've been thinking of series while doing the problem at first.

2007-12-13 03:22:19 · 3 answers · asked by Anonymous in Mathematics

3) Positive hydrogen atoms react with nearby negative hydrogen atoms

Which of the following is the correct formula for the element when in its natural state?
1) H
2) H2
3) Mg2

Water is a polar molecule because:
1) the one Oxygen has more pull on the electrons than the Hydrogens.
2) the single Oxgen atom is larger than the two Hydrogen atoms combined.
3) the one Oxygen has less pull on the electrons than the Hydrogens

Multiple bonds form because each atom in a molecule needs more than one electron to form an octet.
1) True
2) False

Which of the following is the correct formula for the element when in its natural state?
1) Na2
2) Na
3) Br

2007-12-13 03:22:16 · 5 answers · asked by sammy 1 in Chemistry

At "Beyond Belief '07: Enlightenment 2.0" (http://thesciencenetwork.org/BeyondBelief2/) Prof. Peter Atkins made the case that, just as theology must step aside in view of the power of the scientific method, it is time for philosophy to do the same.
I have a lot of respect for Prof. Atkins. However, I am at heart both a philosopher and a scientist. Still, I do agree with him that much of philosophy is obfuscation, pessimism and just a damn nuisance!

I wonder what other scientists think of philosophy?

And to those scientists who are interested in philosophy: can you please point out those philosophers who are actually contributing usefully to human thought?

2007-12-13 03:22:02 · 16 answers · asked by Ayn Sof 3 in Other - Science

I've seen knock out gas on movies and in batman series, but are they real? If so what kinda are there and are they really that powerful? Whats the chemical composition of them?
Also if possible how would i get them or make them?

2007-12-13 03:20:20 · 3 answers · asked by Anonymous in Biology

2007-12-13 03:19:38 · 2 answers · asked by Monica c 1 in Earth Sciences & Geology

I have been toiling over this for a while...*how* do you find the slope of a negative value for x in the graph of the parabola y = (1/100)x^2??

As an example, could you guys give me an explanation as to **how** you would get the answer for the point (-100, 100)???

2007-12-13 03:18:58 · 5 answers · asked by netsurfer733 2 in Mathematics

Recently I was checking out an electrical failure at a friend's house and put a meter on the output of each of the breakers to see if failure had occurred in one, even tho they were not tripped. I was amazed to see that one of the two sides of the power read over 123 volts to neutral and the other read just at 120 volts.- American "110/220" house power. Appliances must work within a 110-125 range measured to ground but I expected the legs to be almost identical. I admit I haven't measured a bunch of them, so I ask here. [I contacted TXU Electric, but under deregulated power in Texas, they won't answer it referring it over to Oncor, the spun off power delivery company.]

2007-12-13 03:17:47 · 4 answers · asked by Mike1942f 7 in Engineering

What is scale model?
i have to do project in my chemistry class about a birthstone
and the teacher said dont make a poster but scale model. and it had to be a 3-d model of my birthstone???

what does that mean ??? scale model and how it looks like?

2007-12-13 03:16:38 · 6 answers · asked by beauty mirna 3 in Chemistry

4) 3^2 - 2x = 1


Thank you

2007-12-13 03:15:05 · 2 answers · asked by Anonymous in Mathematics

i'm very claustrophobic and i was wondering this.

2007-12-13 03:14:17 · 35 answers · asked by Mainee 1 in Other - Science

The heights of 600 students were measured. The mean was found to be 65 inches with a standard deviaton of 2.5 inches. If the heights are approximately normally distributed, then 95% of the students should be between which 2 heights?

________ and ________

How many of the students should be less than 5 feet tall?


Thank You very much..

2007-12-13 03:13:57 · 2 answers · asked by azen 1 in Mathematics

2007-12-13 03:13:43 · 4 answers · asked by Paul 2 in Engineering

2007-12-13 03:09:43 · 3 answers · asked by Godfrey A 1 in Mathematics

North and South have Poles and are relativity fixed as being top and bottom of the globe, but East and West have no such markers, so how can we determine which parts of Earth are East (Japan/China etc) and which are West (USA) on a constantly spinning circular object?

I expect it has something to do with the rising/setting of the Sun, but this happens all over the planet, so how exactly are East and West defined?

2007-12-13 03:03:58 · 10 answers · asked by Innocuous pen... 4 in Geography

please help me answer these questions step-by-step..
1) Find two numbers whose sum is 9. If the product of one by the square of the other is a maximum.

2)The sum of the bases and the altitude of a trapezoid is 36 inches longer than the other. Find all three dimensions if the area is a maximum.

3)Find the shortest distance from the curve (y²=x³) to the point (8,0).

Help me please... T_T

2007-12-13 03:02:14 · 1 answers · asked by shebi 1 in Mathematics

a) spontaneous
b) incomplete
c) exothermic
d) endothermic

2007-12-13 03:00:32 · 6 answers · asked by Anonymous in Chemistry

Why does the temprature remain unchange at the melting point when a solid melt into liquid?

2007-12-13 03:00:24 · 4 answers · asked by Y T 1 in Chemistry

this should be SOO simple and i therefore am guessing that there is a glitch in the answers cause I dont see where i went wrong...maybe, i dunno...
Given that
sin theta = y /r
cos theta = x/r
tan theta = y/x
PROVE the following identity:
[ (1 + cot^2 theta) / (csc^2theta) ] = 1

can anyone help?? i cant get the LS to equal the RS :S
also, a slightly more difficult identity, i was having trouble:

prove:
[ (csc theta) / (1 + csc theta)] + [ (csc theta) / (1 - csc theta)]
= [(2 sin theta) / cos^2 theta)]

please help...i dont know where i am going wrong!! i would appreciate anyone's help! thanks ^_^

2007-12-13 02:57:57 · 9 answers · asked by Anonymous in Mathematics

2007-12-13 02:57:54 · 16 answers · asked by Anonymous in Other - Alternative

I need to know if Orlando, Florida's biome is a temperate deciduous forest, or a tropical rain forest.

2007-12-13 02:54:51 · 3 answers · asked by moomaid2004 1 in Earth Sciences & Geology

2007-12-13 02:52:50 · 1 answers · asked by girl 4 in Medicine

How can the Doppler effect be used to identify whether a star is approaching or moving away from Earth?

2007-12-13 02:50:10 · 2 answers · asked by Anonymous in Other - Science

i can't understand how a gumamela plant reproduce, they can be fertilized because they have both male and female organs but they don't form fruits. so how will they get there seed to grow and form a new plant if they don't even produce fruits???

2007-12-13 02:49:35 · 2 answers · asked by Anonymous in Botany