Science & Mathematics - 25 September 2007

What is the lowest multiple of 49 that is composed of the same digits (e.g. 444, 7777). Please explain how to get this without using a calculator.

2007-09-25 17:37:32 · 2 answers · asked by Shawn B 1 in Mathematics

2007-09-25 17:36:08 · 4 answers · asked by Anonymous in Astronomy & Space

2007-09-25 17:35:19 · 19 answers · asked by Anonymous in Paranormal Phenomena

What are the horizontal asymptotes for the following equations:

arctan(x^(4)-x^(2))

cot^(-1) (x^(2)-x^(4))

e^(1/x)

Help would be much appreciated :)

2007-09-25 17:35:09 · 5 answers · asked by tweek_2_4 2 in Mathematics

He
N2
HCl
H2

2007-09-25 17:33:15 · 1 answers · asked by Anonymous in Chemistry

5. A gas sample collected at 35.0?C and a pressure of 710 torr has a volume of 200 mL. The temperature and pressure are changed, and the gas is compressed to 150 mL. The new temperature is 40.0?C, what is the new pressure?
1.27 atm
1.08 x 103 torr
541 torr
0.712 atm

2007-09-25 17:27:39 · 2 answers · asked by Anonymous in Chemistry

water is often called the universal solvent because it deissolves most substances that are important to living things. what does this suggest about the nature of those substances?

2007-09-25 17:27:27 · 6 answers · asked by Anonymous in Physics

Ok the moon, no one owns it. How can they sell its properties?
What? ok who will live there? Or they just wanna pay and proove everyone know that they own the moon to be famous?

2007-09-25 17:26:31 · 7 answers · asked by Kelly X 1 in Astronomy & Space

Can someone please help me write an equation and solve this math problem?

A group agrees to share equally in the cost of a $48,000 piece of machinery. If they could find two more group members, each member's share of the cost would decrease by $4000. How many are presently in the group?

2007-09-25 17:25:58 · 5 answers · asked by Alexis's Love Potion #9 4 in Mathematics

Please answer.

I have to write a report.

and I have to do so now. If you are smart and you can tell me please do so. thanks. =]

2007-09-25 17:25:29 · 4 answers · asked by loverofdragons21 3 in Earth Sciences & Geology

well i remembered a jesus saying (if salt looses its saltyness how can it get its saltyness back)?.so it made me think if it loose its saltyness its just a grain of sand.

2007-09-25 17:24:35 · 6 answers · asked by mark w 1 in Chemistry

I heard it tonight on Law & Order

2007-09-25 17:21:35 · 7 answers · asked by Anonymous in Zoology

2007-09-25 17:19:56 · 4 answers · asked by Anonymous in Mathematics

how about those ufo sightings...

2007-09-25 17:18:24 · 7 answers · asked by ? 3 in Astronomy & Space

For example, since zero (0) is nothing and there are simple equations that can equal that the simplest being x - x = 0; is there a similar simple equation that would equal infinity? And if there isn't, is it possible that such an equation exists but we haven't figured it out yet?

2007-09-25 17:15:04 · 13 answers · asked by Phoenix Souvenir 3 in Mathematics

[b]1. The problem statement, all variables and given/known data[/b]

A positively charged particle of mass 7.40 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.38 T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 4.40 10-3 s, at which time it leaves the field heading due south. All during the motion the particle moves perpendicular to the magnetic field.

(a) What is the magnitude of the magnetic force acting on the particle?
N

(b) What is the magnitude of the charge of the particle?
C

[b]2. Relevant equations[/b]
v = 2* pi * r / T
F_c_ = mv^2 / r

Circumference = 2 * pi * r
B = F / (q*v*sin theta)

[b]3. The attempt at a solution[/b]

First I found r by using the first equation to be 58 m, but since it only went 1/4 of the way i took the the circumference (2 * 58 * 3.14) = 364.24 * .25 (1/4 of the circle was travelled) and then got lost

but then also tried this way which i really thought was right:

2007-09-25 17:14:11 · 2 answers · asked by flabbalicious 1 in Physics

I am so confused on my logic homework right now. Any help would be appreciated.

2007-09-25 17:14:02 · 6 answers · asked by iridescent_opal 2 in Mathematics

How do you solve a question like this:
Solve this linear system:
a-b-c=-1
a+c=2
a-2b=-7

I`m used to solving it when there`s 3 of the same variables in each equation...these are mixed up. How do I do this

2007-09-25 17:12:45 · 6 answers · asked by Laney 2 in Mathematics

2007-09-25 17:10:42 · 6 answers · asked by ohoma 1 in Mathematics

How long can the capacitors in small electronic equipment hold a charge after the equipment is turned off? Like small Radios, mp3 players, phones for example. After you turn off a radio, how long will the capacitor hold energy?

2007-09-25 17:07:37 · 4 answers · asked by Anonymous in Physics

strontium-90 has a half life od 25 years. how much time has elapsed if the following fraction remains in a sample?
1) 1/4
2) 1/32

2007-09-25 17:06:42 · 5 answers · asked by Anonymous in Mathematics

The base dissociation constant of pyridine (C5H5N) is Kb = 1.7 x 10-9.

At 25 °C, Keq = 0.0146 for the following reaction:
PCl5 PCl3 + Cl2

2007-09-25 17:05:43 · 2 answers · asked by virgo 1 in Chemistry

A force F = 72.8 N acts at an angle = 37degrees
with respect to the horizontal on a block of
mass m = 22.3 kg, which is at rest on a
horizontal plane.
The acceleration of gravity is 9.81 m/s2 :
If the static frictional coefficient is us / 0.8,
what is the force of static friction?

2007-09-25 17:01:58 · 1 answers · asked by Jessica J 1 in Physics

1. Evaluate 8x - 4y when x=2 and y=3

2. Simplify 3 - 10 + 9 x 7

3. Simplify 16 - 10 divided by 5 + 10

4 Simplify 2 + 3 x 10 divided by 5 x 3 - 9

5. Evaluate 3x + 5y when x=11 and y=4

2007-09-25 16:57:01 · 5 answers · asked by quaqua88 1 in Mathematics

I have the answers to this problems because they're in the back of my book, but can somebody explain me how to do them? They are simple but I dont know any math. :(

14 is 30% of what numer?

what is 2% of 40?

sammy sosa had 193 hits, his batting average was 0.320 (32%) this is the total of at-bats (32%) how many at-bats did he have?

2007-09-25 16:54:48 · 15 answers · asked by JESSY JAY! 3 in Mathematics

2007-09-25 16:50:40 · 14 answers · asked by Grass Hopper 2 in Weather

Slope-intercept form of 4x = -1/2y - 1?

2007-09-25 16:50:35 · 3 answers · asked by ShaZ 1 in Mathematics

I have already read - The Holographic Universe by Micheal Talbot, and Hyperspace by Michio Kaku, The Elegant Universe by Brian Greene and The Big Questions by Richard Morris. Can you name any that fall into this area or something that will blow my mind?

2007-09-25 16:47:53 · 5 answers · asked by Talent 3 in Astronomy & Space

How does a pulley make work easier if it doesn't multiply??

2007-09-25 16:44:38 · 5 answers · asked by Mwahahah!! 1 in Other - Science

y= 6x / (x+1)^2 at point (0,0)

2007-09-25 16:40:47 · 2 answers · asked by Anonymous in Mathematics