Science & Mathematics - 20 December 2007

i need the answer.

2007-12-20 13:11:26 · 17 answers · asked by Anonymous in Geography

simplify.

1. 5 sqrt 3 -4 sqrt 7



2. 2 sqrt 12 +4 sqrt 27

10 PTS TO THE ANSWER AND SHOW WORK PLEASE!

2007-12-20 13:10:15 · 4 answers · asked by God Bless America!~ 4 in Mathematics

Using g = m/r^2?
What is the acceleration due to gravity at an altitude of 1.00 x 10^6 above the earth's surface, given that the radius of the earth is 6.38 x 10^6 m?
How do i go about solving that?

2007-12-20 13:07:38 · 2 answers · asked by Voldemort 2 in Physics

2007-12-20 13:04:16 · 9 answers · asked by Anonymous in Mathematics

2007-12-20 13:04:14 · 4 answers · asked by lildude3216 2 in Mathematics

2007-12-20 13:00:07 · 2 answers · asked by spongeboblorapants 1 in Astronomy & Space

2007-12-20 12:59:33 · 6 answers · asked by loops 1 in Engineering

2007-12-20 12:58:02 · 3 answers · asked by Kohzlick 3 in Astronomy & Space

2007-12-20 12:55:37 · 9 answers · asked by rache0116 3 in Astronomy & Space

for boating and sailing purposes

2007-12-20 12:52:57 · 3 answers · asked by Anonymous in Geography

This evening around 5:30/6 something fell out of the sky north of Clay Rd. in Houston. Does anyone know what it was? An article or something that may have been posted?

2007-12-20 12:51:22 · 5 answers · asked by Amanda D 3 in Astronomy & Space

a 100kg crate is resting on level ground, with a cluster of helium balloons tied to the top. The helium balloons provide an upward force of 100 N.
a) Draw a freebody diagram of the forces on the crate.
b) Calculate the force of gravity on the crate.
c) If you must apply a 1000 N force to get the crate to move, what is the coefficient of static friction newt(s)?
d) If you apply a horizontal 1100 N force to the box, what will be its rate of acceleration?(consider friction)

2007-12-20 12:51:17 · 5 answers · asked by Alonso 1 in Physics

For Algebra 2 and etc. is it absolutely mandatory that you need a graphing calculator? If it is what kind do you have? (If you have one.) I wanted to know this because I bought a TI-84 plus today, and i was wondering if I didn't need one because i already have a TI-34 2nd. Also if it was better to by a TI-84 plus silver addition, TI-85 plus or TI-85 plus silver addition. Thanks!

Have a Merry Christmas and a Happy New Year!

2007-12-20 12:50:47 · 11 answers · asked by Anonymous in Mathematics

I search it on Google and get a bunch of useless crap.. >_< Please Help :D :D

2007-12-20 12:48:53 · 3 answers · asked by ~D@$H~ 2 in Botany

A year is the time it takes the Earth to go round the Sun. A day is the time it takes the Earth to rotate on its own axis. A month, until we began messing about with the calendar, was the time it took the Moon to go through it's phases. The week appears to have no logical definition. Was seven days pre-Genesis? Or did the bible define the week?

2007-12-20 12:48:32 · 9 answers · asked by Ken G 1 in Astronomy & Space

2007-12-20 12:47:00 · 5 answers · asked by P Srey 1 in Physics

geometry

2007-12-20 12:46:11 · 1 answers · asked by Tiá»?u Bảo 2 in Mathematics

2007-12-20 12:46:10 · 13 answers · asked by fpmessenger5 1 in Zoology

2007-12-20 12:43:53 · 8 answers · asked by Anonymous in Mathematics

2007-12-20 12:42:32 · 1 answers · asked by nicole 15 1 in Physics

i can't figure out some of these questions..so if u guys know the answers..reply as soon as possible..thanks!!

1. how does the structure of a chloroplast enable it to build up a concentration gradient of protons?

2. what are the energy-carrying end products of the light harvesting reactions?

3. explain the function of accessory pigments.

THANKS ALOT!!!

2007-12-20 12:42:26 · 1 answers · asked by let_it_rain 3 in Botany

2007-12-20 12:42:08 · 7 answers · asked by Anonymous in Mathematics

2007-12-20 12:40:24 · 1 answers · asked by Anonymous in Geography

2007-12-20 12:39:21 · 1 answers · asked by coolseantadlock 1 in Physics

A 31 kg cannon ball is fired from a cannon with muzzle speed of 864 m/s at an angle of 32.9 degrees with the horizontal.
Gravity is 9.8 m/s/s.
A.) Use conservation of mechanical energy to find the maximum height reached by the ball.

B.) A second identical ball is fired at an angle of 132 degrees.
What is teh total mechanical energy at the maximum height of the second ball. Answer in units of J.

Please show your work and thanks for the help!
Happy Holidays!!!!!

2007-12-20 12:34:49 · 1 answers · asked by Anonymous in Physics

2007-12-20 12:34:40 · 8 answers · asked by Anonymous in Mathematics

2007-12-20 12:34:29 · 7 answers · asked by Anonymous in Astronomy & Space

2007-12-20 12:32:44 · 3 answers · asked by La_Liona 4 in Weather

And how about other systems that we know about? For example, very few exoplanets are transiting, so those that are, is it coincidence or what?

2007-12-20 12:32:01 · 3 answers · asked by the boy from tortuga 4 in Astronomy & Space

in biological terms

2007-12-20 12:30:00 · 6 answers · asked by The Exotic Dr. Congo 3 in Biology