Science & Mathematics - 30 August 2007

Belgium
Benin
Burkina-Faso
Burundi
Cameroon
Canada
Central African Republic
Chad
Comoros
Democratic Republic of Congo
Djibouti
France
Gabon
Guinea
Haiti
Ivory Coast
Luxembourg
Madagascar
Mali
Monaco
Niger
Republic of Congo
Rwanda
Senegal
Seychelles
Switzerland
Togo
Vanuatu

2007-08-30 12:26:11 · 23 answers · asked by Anna D. 1 in Geography

express in a single logarithm

ln(a + b) + ln(a - b) - 3 ln(c)
e^(a+b)+e^(a-b)-3e^(c)
(a+b)(a-b) cancel each other?
leaving 3e^(-c)?
or is my thought not correct?

2007-08-30 12:24:01 · 3 answers · asked by m_carl 1 in Mathematics

The class I am in right now is mixed with the BC calculus and the teacher wants the AB kids to learn BC stuff as well. The problem is if I learn both I'm afraid I might fail the class because just doing AB seems easier. Should I just take calculus in high school or learn it in college? Will this make me look bad? Please help.

2007-08-30 12:20:14 · 9 answers · asked by crimsonxskies 1 in Mathematics

can some one help me list these units in order from largest to smallest
1dm3
1uL
1mL
1L
1cL
1dL

2007-08-30 12:10:24 · 1 answers · asked by Anonymous in Chemistry

Any suggestions for keeping cooler in school, it is 95 degrees outside and cooler than inside in the classrooms. I have been bringing an iced water bottle, any other good suggestions?

2007-08-30 12:09:26 · 7 answers · asked by Anonymous in Weather

2007-08-30 12:09:08 · 5 answers · asked by Anonymous in Mathematics

Find the domain of f:

f(x)=ln(6-6x^2)

2007-08-30 12:07:04 · 2 answers · asked by Lauren 1 in Mathematics

Write the answer in standard form.

2007-08-30 12:01:22 · 7 answers · asked by bealsey1 2 in Mathematics

Find (-3+5i)-(-4+6i)

2007-08-30 11:59:43 · 3 answers · asked by bealsey1 2 in Mathematics

A ball with radius 0.1 m falls vertically downward while rotating with angular velocity, ω. The ball hits the ground at 10 m/s and bounces with the same vertical speed. The coefficient of friction, μ is 0.9 (same for static and kinetic friction).

What is the horizontal velocity of the ball after bouncing if:
i) ω = 400 rad/sec
ii) ω = 500 rad/sec?

The mass moment of inertia of the ball is
I = 2/5 * mr^2
m = 1 kg (if needed)

2007-08-30 11:58:47 · 3 answers · asked by Dr D 7 in Physics

A pyramid has a rectangular base 10 cm by 25 cm and four triangular faces; two opposing faces both with altitude 13 cm and the other two faces with altitudes of 20 cm and 15 cm. What is the volume of the pyramid, in cubic cm?

It's for Math Counts. Please do not solve it for me, because I want to solve myself. Instead, explain the steps to me, such as using examples.

Please list the steps too.
Such as 1) Add all altitudes and find average, etc...

I will choose a best answer if it is the one that helps me the most. Thank you~

2007-08-30 11:57:48 · 2 answers · asked by Nyan 2 in Mathematics

2007-08-30 11:56:00 · 11 answers · asked by BBHunter 5 in Biology

(3x^2y + 4z^2y) - (-9x^2y + 11z^2y) + (7x^2y + 11x^2y)

2007-08-30 11:55:55 · 9 answers · asked by shellyeph 1 in Mathematics

It can't be man-made, living or breathing.

2007-08-30 11:55:22 · 2 answers · asked by Anonymous in Geography

2 x 2 matrix

find as many square roots as you can of A= top column 4 0 bottom column 0 9


hint: if A = top column a b bottom column c d
c d
write the equations that a,b,c,d would have to satisfy if A is the square root of the given matrix

2007-08-30 11:52:59 · 1 answers · asked by Shukie L 1 in Mathematics

How do you "factor by grouping" in Pre-Calc?

My pre-calc packet asks me to "factor by grouping".. and I am a bit confused.

Here are some of the questions that tell me to "factor by grouping":
1. x^3 - x^2 + 2x - 2
2. 2x^3 - x^2 - 6x + 3
3. 6x^3 - 2x + 3x^2 - 1

If you could explain it to me it would really help, thanks!

2007-08-30 11:52:46 · 3 answers · asked by AJ B 1 in Mathematics

(1) About 17 % of kids will attend an overnight summer, 11/50 will attend a day camp,ad 0.59 will attend no summer camp at all.Which roup of kids is the gratest?



plzplzplzplzplz

2007-08-30 11:52:10 · 6 answers · asked by Anonymous in Mathematics

∞
∫dx / (x^2 - 1)
0

2007-08-30 11:46:28 · 4 answers · asked by Dr D 7 in Mathematics

2007-08-30 11:43:20 · 7 answers · asked by Anonymous in Astronomy & Space

One cubic meter (1.0m^3) of aluminum has a mass of 2700kg, and 1m^3 iron has a mass of 7860kg. What would the radius of a solid aluminum sphere be if it has the same mass as a solid iron sphere with a radius of 2.4 cm. Answer in cm.
Please tell me whats the answer and how u got it.!!!
thanks in advance

2007-08-30 11:37:17 · 2 answers · asked by Anonymous in Mathematics

www.keypress.com/Documents/dg3/ PracticeYourSkills/DG_PYS_01.pdf

2007-08-30 11:36:13 · 2 answers · asked by simbainkempner 1 in Mathematics

2007-08-30 11:34:58 · 4 answers · asked by bhs2paint 2 in Engineering

I could swear that there's a few buzzing about in the bathroom, but they aren't native, are they? Or were they always here?

2007-08-30 11:34:00 · 18 answers · asked by Buzzard 7 in Zoology

2007-08-30 11:33:22 · 3 answers · asked by Pynkk 1 in Medicine

It's about 2 - 3 cm long. Black, it has quite a long thin abdomen which it curls up like a scorpion when threatened and large mandibles

2007-08-30 11:33:08 · 8 answers · asked by tootnuts 3 in Zoology

An automobile traveling 105 km/h overtakes a 1.50 km long train traveling in the same direction on a track parallel to the road.
1). If the train's speed is 75 km/h, how long does it take the car to pass it? in hr

2). How far will the car have traveled in this time? in km

3). What are the results if the car and train are traveling in opposite directions? in km

Please i really need to know how to do this and also please show the work Thanks :)

2007-08-30 11:28:40 · 2 answers · asked by Nikita 1 in Physics

1. you have a box of sand and a can of water. each has a mass of 1kg. which weighs more?

2. on earth, an astronaut weighs 60kg. how much will she weigh on the moon?

3. the gravity on jupiter is 2 1/2 times greater that of the earth. how much would the 60-kg astronaut weigh if she could land on jupiter? how much mass would she have?

4. what must airplanes and rockets do to fly through the air?

2007-08-30 11:27:53 · 2 answers · asked by piinkpolkadots 1 in Astronomy & Space

2007-08-30 11:27:29 · 10 answers · asked by MAEGATAR@!#$% 1 in Earth Sciences & Geology

(-2x)^3 * (-3x)^2

Thanks!

2007-08-30 11:26:05 · 3 answers · asked by burgerbabe84 2 in Mathematics

How can I show that, if a subset A of R^n is compact, then every open cover of A contains a finite subcover?

Thank you

2007-08-30 11:23:23 · 2 answers · asked by Anabela 1 in Mathematics