Science & Mathematics - 18 October 2007

Please explain!
Thanks a bunch!

2007-10-18 08:09:55 · 4 answers · asked by Anonymous in Chemistry

Have they found the boundary, is it forever expanding?

2007-10-18 08:07:26 · 19 answers · asked by Anonymous in Astronomy & Space

2007-10-18 08:06:53 · 5 answers · asked by Tiffany M 1 in Chemistry

A 5.0 kg block is pushed 4.0 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of = 30° with the horizontal, as shown in Figure P5.70. If the coefficient of kinetic friction between block and wall is 0.30, determine the work done by each of the following.


(a) the force
J
(b) gravity
J
(c) the normal force between block and wall
J
(d) By how much does the gravitational potential energy increase during the block's motion?
J

2007-10-18 08:06:14 · 3 answers · asked by Anonymous in Physics

The m1 = 5.35 kg object is released from rest at a point 4.00 m above the floor, where the m2 = 3.30 kg object rests.


(a) Determine the speed of each object when the two pass each other.
m/s
(b) Determine the speed of each object at the moment the 5.35 kg mass hits the floor.
m/s
(c) How much higher does the 3.30 kg mass travel after the 5.35 kg mass hits the floor?
m

2007-10-18 08:03:55 · 2 answers · asked by Anonymous in Physics

a) KOH and HCl
b) Pb(NO3)2 and Nai
c) Na2SO4 and BaCl2
d) Na2CO3 and CaCl2
e) KOH and Mg(NO3)2
f) HCl and KIO3
g) Sr(NO3)2 and KIO3

2007-10-18 08:03:22 · 1 answers · asked by Circuiteer 1 in Chemistry

I need this answer ASAP ! thx !

2007-10-18 08:02:24 · 1 answers · asked by Anonymous in Chemistry

y=√x-1

2007-10-18 07:57:33 · 3 answers · asked by Anonymous in Mathematics

i have a statistics test i studied but i want someone to help me in getting websites to practice the book is called elementary statistics by mario f. triola the topics in the test are
1. introduction to statistics
2. summarizing and graphing data
3. statistics for describing, exploring, and comparing data
4. probability
5. probability distributions
i just want to practice to ace the test

2007-10-18 07:55:31 · 1 answers · asked by xssgx911 1 in Mathematics

1. Write a balanced equation for the formation of carbon monoxide (CO) from the elements of carbon, C, and oxygen, O2.

2. Calculate the percentage of sulfur, by weight, in sulfur trioxide, SO3.

3. A gas is contained in a balloon with a volume of 35 L at a temperature of 30 degrees C. What temperature must be reached in order for the balloon to expand to a volume of 50 L, at constant pressure?


Please show work. Any and all help is very much appreciated!! Thanks in advance! :)

2007-10-18 07:55:00 · 1 answers · asked by Kate 1 in Chemistry

(6 x 10¹)+(8 x 10°)+(1 x 10¯¹)+(3 x 10¯²)

2007-10-18 07:54:29 · 11 answers · asked by Anonymous in Mathematics

2007-10-18 07:53:39 · 8 answers · asked by Anonymous in Earth Sciences & Geology

Trying to complete yet another Algebra homework assignment, and I am stuck on 4 problems. Would someone mind helping me solve the problems, and also explain why you did what you did? THANK YOU for your help! "Answers" has been a blessing when it comes to my Algebra homework!!! :o)

1. p^-5q^-4 / 9r^-3

2. (p^-4q / r^-3)^-3

3. (m^8n^-4)^2 / m^-2n^5

4. (wz^-5 / w^-3z)^-2

THANK YOU AGAIN TO ALL YOU MATH WHIZZES!!! :o)

2007-10-18 07:53:20 · 3 answers · asked by mrsdynamite 2 in Mathematics

how else to I pull pins out of a dsub connector? I don't have an extraction tool. Any tips?

2007-10-18 07:53:02 · 5 answers · asked by samwarr 2 in Engineering

According to Dalton's atomic theory, an atom is:
a) made of smaller particles
b) a particle with a positive charge
c) the smallest particle of an element
d) in constant motion
e) a particle with a negative charge

2007-10-18 07:52:22 · 1 answers · asked by Anonymous in Physics

Pop Quiz (I learned a useless fact and want to know who else knows it).

During a typical month, what percentage of the moon can we see, and why?

2007-10-18 07:49:25 · 8 answers · asked by It's the hair 5 in Astronomy & Space

I know there are very little or no traces of melanin in blue eyes, and I'm assuming that is for light to dark blue eyes. So does anyone know what makes individuals have different shades of blue eyes? (or for any color of eye for that matter)

2007-10-18 07:49:09 · 2 answers · asked by anonymous 1 in Biology

1/(√1 + √3) + 1/(√3+√5) + 1/(√5+√7) +…+ 1/[√(2n-1) +√(2n+1)] = 100

. Solve for n
. Find n for the same sum = L (instead of 100)
I'm in the Log Chapter. So I think think prob should be solve by using log.
Thanks for your help

2007-10-18 07:44:33 · 2 answers · asked by spykid1803 1 in Mathematics

(a) Always lies at the center of the object,
(b) Is at the location of the most massive particle in the object,
(c) Always lies within the object,
(d) None of the above?

2007-10-18 07:43:48 · 5 answers · asked by Pascal 4 in Physics

a) have no energy
b)have the lowest possible energy
c) have the highest possible energy
d) are in an excited state
e) are in an unstable state

2007-10-18 07:43:01 · 5 answers · asked by Anonymous in Physics

Answer in one paragraph.

2007-10-18 07:42:53 · 1 answers · asked by Anonymous in Astronomy & Space

2007-10-18 07:42:29 · 11 answers · asked by theoneuluv08 1 in Astronomy & Space

2007-10-18 07:41:12 · 1 answers · asked by Pascal 4 in Physics

A. Proteins

B. Carbohydrates

C. Lipids

D. Enzymes

2007-10-18 07:40:40 · 5 answers · asked by Anonymous in Chemistry

1) Hydrogen cyanide is used in the manufacture of clear plastics such as Lucite and Plexiglas. It is prepared from ammonia and natural gas (CH4).

2NH3(g) + 3O2(g) + 2CH4(g) --> 2HCN(g) + 6H2O(g)

The reaction evolves 739 kJ of heat per 2 mol HCN formed. What is the value of q (in kJ)?

2) Hydrogen sulfide, H2S, is produced during decomposition of organic matter. When 0.5000 mol H2S burns to produce SO2(g) and H2O(l) -282.7 kJ of heat is released. What is this heat in kilocalories?

2007-10-18 07:40:26 · 1 answers · asked by keya_na 2 in Chemistry

I'm just not sure.

2007-10-18 07:39:11 · 7 answers · asked by Brandon's been a dirty Hore 5 in Agriculture

I want to know if you take into consideration that spirit audibles or where ever EVPs come from may not know a forward and reverse or may get reversed onto a machine that records.
Do you ever play EVPs backwards to see if they sound more like real speech.
They always sound like backmasking to me. I could link to the Youtube zeppelin backwards videos, but you can look them up if you want to hear them. They sound like all of the EVPs I have heard and they are backwards.

2007-10-18 07:38:45 · 5 answers · asked by Anonymous in Paranormal Phenomena

2007-10-18 07:36:05 · 5 answers · asked by Anonymous in Chemistry

2007-10-18 07:35:57 · 12 answers · asked by Anonymous in Chemistry

2007-10-18 07:33:48 · 7 answers · asked by Anonymous in Geography