Science & Mathematics - 18 September 2007

2007-09-18 10:34:13 · 2 answers · asked by shay 2 in Biology

You wish to defeat Superman for your own nefarious purposes. You have obtained a 4.00 in
diameter sphere of Kyptonite (denisity = 26.7 g/cm3).

2007-09-18 10:30:37 · 1 answers · asked by Anonymous in Chemistry

Here's the question, does anyone know the answer?

The parellelogram bounded by the lines y=ax+c , y=ax+d , y=bx+c , and y=bx+d has the area 18. The parellogram bounded by the lines y=ax+c , y=ax-d , y=bx+c , and y=bx-d has the area 72.

Given that a ,b ,c and d are positive integers, what is the smallest possible value of a+b+c+d?

If possible, could you explain how you got your answer so I could learn?
Thanks! :)

2007-09-18 10:30:15 · 2 answers · asked by Anonymous in Mathematics

Having a problem with this math problem

Y= 1 / x-3 ^2

2007-09-18 10:28:14 · 5 answers · asked by joemelle k 2 in Mathematics

-Thinking Critically-
When subtracting or adding two numbers in scientific notation, why do the exponents need to be the same?
-Applying Concepts -
You are converting 68 km to meters. Your answer is 0.068 m. Explain why this answer is incorrect and the likely source of the error.

Please help? and thank you!

2007-09-18 10:27:11 · 3 answers · asked by R3B3LL10N 1 in Chemistry

what set or sets of numbers does 1/3 and -√ 9.16 belong to?

2007-09-18 10:26:44 · 4 answers · asked by Anonymous in Mathematics

This question has been asked before, but there were no definitive answers.

For those of you who have not heard about the experiment, a candle is lit and placed in a water-filled dish. A glass jar is then place over the candle and left. After a few seconds the flame goes out and water is 'sucked' into the jar. The commonly heard explanation is that the candle burns the oxygen that makes up ~20% of the air we breathe creating a vacuum that sucks up the water.

However, this does not seem to be a good explanation for me for the following reasons.

1. The candle is burning oxygen at a fairly constant rate, but the water is only sucked up AFTER the candle is extinguished.

2. Carbon dioxide is a product of the reaction, and is also a gas. Surely it takes up the same volume as the 'burned' oxygen.

So can anyone offer me a good explanation for this phenomenon?

2007-09-18 10:25:55 · 1 answers · asked by Tom 3 in Other - Science

Don't make me build one of these to check the answers!!!

http://s223.photobucket.com/albums/dd78/floodtl/?action=view¤t=Resistors.jpg

2007-09-18 10:24:37 · 4 answers · asked by Anonymous in Physics

solve for x

2^x = 3 / 5

2007-09-18 10:21:48 · 4 answers · asked by Arianna A 1 in Mathematics

2007-09-18 10:20:14 · 1 answers · asked by tati 2 in Biology

Does not have to be in kilometers give me a mesurement i can change to kilometers or tell me a site that could help me. Thanks

2007-09-18 10:19:08 · 6 answers · asked by New Yorker94 1 in Astronomy & Space

Just need help on these last problem and I m done with my homework! I m having problem making an equation for them.

1) Jack, Kay, and Lynn deliver advertising flyers in a small town. If each person works alone, it takes jack 4 hours to deliver the flyers and it takes lynn 1 hour longer than it takes kay. Working together, they can deliver all the flyers in 40% of the time kay working alone. How long does it take Kay to deliver all the flyers alone?

2) Kiran drove from tortula to cactus a distance of 250 mi. She increased her speed by 10mi/h for the 360 mi trip to dry junction. If the total trip took 11 hours what was her speed from tortula to cactus?

2007-09-18 10:17:14 · 3 answers · asked by Pipos 1 in Mathematics

Went in for a headache, and did a basic check-up. What do these notations mean?

Bp-135/78
P-69
R-16
T-10.8

2007-09-18 10:16:57 · 4 answers · asked by ezeman_2000 1 in Medicine

#1. what is the volume in cm^3 o a regular cylinder measuring 5.78 cm tall and 9.2 mm in diameter?

#2.what is the mass of the object above(#1) if it is pure gold?

2007-09-18 10:14:38 · 2 answers · asked by Koala J 1 in Mathematics

i was wondering if you could add 5y+5y cubed???? I need imediate answers!!!!!!!!!!!!

2007-09-18 10:13:07 · 9 answers · asked by Anonymous in Mathematics

arsenic (III) sulfide forms a sol with a negative charge. Which of the following ionic substances should be the most effective in coagulating this sol? KCl MgCl2 Al2(SO4)3 Na3PO4 i am very confused lol

2007-09-18 10:12:06 · 1 answers · asked by Anonymous in Chemistry

I really need help with my biology. I think I've got it but one question, I just don't get.
http://img.photobucket.com/albums/v252/d...
(Question 25)
and
http://img.photobucket.com/albums/v252/d...

helppp?

2007-09-18 10:12:00 · 2 answers · asked by Anonymous in Biology

what is the answer

2007-09-18 10:11:42 · 3 answers · asked by daddys_girl 2 in Mathematics

Somebody gives you a penny one day. Then twice that the next day. Then twice that the next day. How much money do you have on the 25th day? How do I do this? I tried writed it down but I got to something like 25632 and that was only the fifteenth day!

2007-09-18 10:11:19 · 4 answers · asked by Ted (Guitar Legend) 3 in Mathematics

please help me factor this

and please show steps so i can understand

2007-09-18 10:10:34 · 1 answers · asked by Anonymous in Mathematics

what attracted you to science, was it a failure of proof in religion like it was for me, or do u believe in religion while keep an open mind to science at the same time. or do you perfer science over religion and how has it changed your life?
athiest? agnostic? skeptic?

what is your favorite topic in science, and a brief explanation about why. whos is your favorite scientist. throughout history there have been great people whos hard work changed the world through there work. form contemporary scientists of the enlightenment like newton, or classical philosiphers like plato. or my personla hero Carl Sagan who brought the Cosmos to everyone, with the idea "we are a way for the cosmos to know its self

i would like to hear your thoughts

2007-09-18 10:10:12 · 5 answers · asked by darkpheonix262 4 in Other - Science

2007-09-18 10:10:10 · 4 answers · asked by M.K 2 in Astronomy & Space

2007-09-18 10:07:31 · 3 answers · asked by j. s 1 in Weather

what is a good algebraic expression for the product of 5 and a number?

what is a good verbal expression for 2nwith a small 3 next to n plus 12?

15 divided by 3 x 5-4 squared

and lastly how do you evaluate :

2xy-z with a small 3
over z

thanks for anyone that can honestly give me the rights answers and 10 points to person who gives mostly correct answers. thanks!

2007-09-18 10:05:11 · 7 answers · asked by Anonymous in Mathematics

Ok, living in the northern hemisphere, I know that when you flush the toilet or let the water drain out of the bath, the water rotates counterclockwise as it is funneled down the drain. I also know that in the southern hemisphere the water goes down counterclockwise.

What happens at the equator?

As an added bonus question, what would happen if you were flying in a commercial jet OVER the equator and you flushed the toilet at that exact moment. Would the water change directions?

2007-09-18 10:04:59 · 6 answers · asked by dan 4 in Earth Sciences & Geology

-2x (4+5y) - 5x + 2y

2007-09-18 10:00:42 · 2 answers · asked by drakehardacre 1 in Mathematics

To construct the midpoint of a segment, you must actually construct a(n):
a) number line
b) ruler
c) perpendicular bisector
d) angle bisector

Which of the following bisects an angle?
a) point
b) segment
c) ray
d) perpendicular bisector

2007-09-18 09:59:45 · 1 answers · asked by Anonymous in Mathematics

2007-09-18 09:59:02 · 4 answers · asked by oraine g 1 in Earth Sciences & Geology

What is a easy way to learn all the musles in the body???

2007-09-18 09:58:36 · 3 answers · asked by Anonymous in Astronomy & Space

To test the quality of a tennis ball, you drop it onto the floor from a height of 4m. It rebounds to a height of 2m. If the ball is in contact with the floor for 12ms, what is the magnitude of its average acceleration during that contact?

2007-09-18 09:57:05 · 1 answers · asked by sophia 2 in Physics