Science & Mathematics - 25 July 2007

2007-07-25 17:17:56 · 3 answers · asked by Cleveo7 1 in Astronomy & Space

For each of the following processes: state whether it is exothermic or endothermic, identify whether the reactant or products have the higher enthalpy, and state whether heat would be released to or absorbed from the surroundings.

(a) burning kerosene
(b) melting ice
(c) condensing steam at 100 degrees Celsius

And could you please give reasons as well...thanks! :)

2007-07-25 17:14:47 · 5 answers · asked by ♥ Victory ♥ 3 in Chemistry

What are some websites pertaining to numerology and the meanings of numbers?

2007-07-25 17:10:18 · 1 answers · asked by ? 1 in Mathematics

2007-07-25 17:09:23 · 17 answers · asked by cmc 1 in Mathematics

Nostradamus predicted it to be the year 3786 or 3797, so who thinks it's sooner? any info??

2007-07-25 17:06:56 · 9 answers · asked by Moreaux 1 in Astronomy & Space

A Wheel makes 32 revolutions/min. Find in radians the angle through which the wheel turns in 3 seconds. How long will it take to turn 25 degree

2007-07-25 17:04:53 · 4 answers · asked by Kesari 1 in Mathematics

Please give me a FORMAL proof. MANY THANKS.
Prove that if a≠0 then |a+(1/a)|≥2

2007-07-25 17:02:03 · 3 answers · asked by gabriel 1 in Mathematics

A BLUE WHALE OR A T-REX?

2007-07-25 17:01:15 · 8 answers · asked by Anonymous in Zoology

2007-07-25 17:00:01 · 12 answers · asked by cmc 1 in Mathematics

2007-07-25 16:55:49 · 14 answers · asked by that_kid_brandon 1 in Biology

2007-07-25 16:51:45 · 10 answers · asked by cmc 1 in Mathematics

I dont get how to find the measure of an arc.
http://i15.photobucket.com/albums/a372/cowqtie101/mathgeo.jpg
I dont get why the answer to find the measure of arc BC is 54...and i dont get how to find the measure of angle ADB..HELP

2007-07-25 16:51:16 · 3 answers · asked by Egyptian_princess 1 in Mathematics

Food for Thought

2007-07-25 16:48:37 · 17 answers · asked by El Rey 2 in Astronomy & Space

This should be easy peezy for those of you who are in the 15th grade level.

How would I find out how many MINUTES are in a given month?

Are you able to show / tell how you generated your answer?

Start with July '07.

Good Luck & Thanks Again!

2007-07-25 16:47:51 · 7 answers · asked by earthball50@sbcglobal.net 3 in Mathematics

I poured some coke into a bowl and put it in the freezer, something I had done many times before to make a Coke-Slushie of sorts. Anyway, this particular time, I took the bowl out too soon and I saw that the coke was still liquid, but when I dipped my finger into it (to see how cold it was) the whole thing suddenly froze. It turned into ice right before my eyes, soft, mush-like ice. Is there a scientific explanation for this?

PS: I’m pretty sure I wasn’t hallucinating (like a dear friend of mine had suggested,) I’m also sure my freezer isn't possessed, I checked ;)

2007-07-25 16:45:29 · 10 answers · asked by Anonymous in Physics

I am just really pressed for time to get all this work done and my little girl is down with a high fever. I just need some help I cannot figure out for the life of me what they are and I am so beat.


A ball is thrown vertically upward, from the top of a building 80 m high with an initial velocity of 10 m/s. After t s, the height h is given by
When is the ball at a height of 65 m?



A ball is thrown vertically upward, from the top of a building 30 m high with an initial velocity of 5 m/s.
After t s, the height h is given by
When does the ball hit the ground?



A ball is thrown vertically upward, from the top of a building 30 m high with an initial velocity of 5 m/s. After t s, the height h is given by
When does the ball hit the ground?

2007-07-25 16:44:19 · 3 answers · asked by kenogirlmd 2 in Mathematics

2007-07-25 16:42:18 · 12 answers · asked by cmc 1 in Mathematics

can anyone explain why saturn and other gas giants will float in water?
which planets will besides saturn?

2007-07-25 16:38:57 · 10 answers · asked by Kara 2 in Astronomy & Space

2007-07-25 16:37:01 · 7 answers · asked by beeboppinbippity 1 in Mathematics

"Peter and Danny are standing on a merry-go-round which is turning counter-clockwise, as viewed from above. Peter throws a ball directly towards Danny. Does the ball get to Danny? If not, where does it go?"
I think the ball could not goes to Danny because thier linear velocities are different.The ball doesn't have centripetal force, so it won't rotate. But then, where would it go? would it go depends on the position where the two boys stand? it's really confusing and I don't have enough of physics conception. Please explain to me in detail. Thank you.

2007-07-25 16:36:55 · 2 answers · asked by Anonymous in Physics

2007-07-25 16:32:42 · 5 answers · asked by Anonymous in Weather

A d.c. motor draws a current of 50A at 230V. If 200W is dissipated in the form of heat in the motor, how much power is available for mechanical work?

2007-07-25 16:29:52 · 4 answers · asked by Anonymous in Physics

How come the star never changes? The whole sky moves but not the north star???? I don't undterstand?

2007-07-25 16:28:09 · 10 answers · asked by Wondering 2 in Astronomy & Space

okay welllll i have a algebra 2 math final tomorrow and I really don't know how to do these two problems, just please try to help me as much as you can, thanks if advance! :)

x^2 -2x-8=4

and

1- 4 over x+6 = 4 over x

2007-07-25 16:22:25 · 1 answers · asked by Anonymous in Mathematics

∫1,0 39sqrt(1-x^2)

n=10
n=100
n=1000

2007-07-25 16:22:05 · 2 answers · asked by latina_babygirl002 1 in Mathematics

2007-07-25 16:16:41 · 5 answers · asked by vijaysai 1 in Geography

When I hit a ball on a wall, the ball comes back. Can somebody pl explain the physics behind. Why doesn't the ball just lose its horizontal velocity and drops down, or why doesn't it lose both its horizontal and vertical velocity and sticks to the wall.
Thanks

2007-07-25 16:13:25 · 2 answers · asked by learner 1 in Physics

I can ♥

2007-07-25 16:05:40 · 8 answers · asked by »cottoncandy 6 in Astronomy & Space

If we talk about the the far side of the spaceit is infinite,and a number is infinite but imaginary,and the diff.bet. them is infinite also.for me it is an evidence that Lord GOD is existing,it mysterious

2007-07-25 16:05:02 · 3 answers · asked by Marlou G 1 in Astronomy & Space

In a simple amplifier circuit. I'm aware of the functional differences, but I'd be okay so long as the the potential never exceeded the former zener diode's breakdown voltage, right?

2007-07-25 16:01:31 · 4 answers · asked by jsprplc2006 4 in Engineering