Science & Mathematics - 18 December 2007

We're working on solving systems of equations by using augmented matrices in school. Is there someone who could try to explain it to me (again) so that I get it? It seems like a always do something wrong. If it'll help, you can im me on aol (akaneko07@aol.com) or msn (doesdeathbecomeme@hotmail.com) I just really want to understand this...

2007-12-18 10:48:42 · 1 answers · asked by Doesdeathbecomeme? 1 in Mathematics

who was the first map maker for the super contenet of Pangea

2007-12-18 10:48:13 · 6 answers · asked by Anonymous in Geography

When Fg = G*m1*m2/r^2

How can i prove Fg = m*g by

deriving from upper equation?
Do i need to plug in mass and radius of earth?

2007-12-18 10:44:29 · 1 answers · asked by Anonymous in Astronomy & Space

2007-12-18 10:43:37 · 2 answers · asked by Jenn G 4 in Geography

My dad just said that any map can be drawn with only 4 colors, and the same color will not be touching itself. (I.E. There is no regional political map where 5 things intersect) Can anyone prove this wrong?

2007-12-18 10:38:53 · 4 answers · asked by metroidfan220 4 in Geography

can you help me find the equation for the inverse of the relation...?

1.) y = 2x

2.) y = -x + 5

2007-12-18 10:37:29 · 1 answers · asked by Juan C 6 in Mathematics

As part of some lecture notes I'm trying to calculate the following:

x = (1/N) (Mod R)

where N = 1073741827

and R is 4294967296

How do I solve this? The answer is given as 1789569707.
Is this the only answer?

thx

2007-12-18 10:37:06 · 2 answers · asked by Anonymous in Mathematics

2007-12-18 10:36:48 · 3 answers · asked by Alexander 6 in Physics

I need this for my essay and i have no idea what im doing please help!

2007-12-18 10:36:13 · 4 answers · asked by IMMLIKECOOOL=] 2 in Geography

2007-12-18 10:35:41 · 4 answers · asked by Bakhtiar H 1 in Zoology

Please help! Specific answers please!

2007-12-18 10:35:28 · 5 answers · asked by Anonymous in Earth Sciences & Geology

i know that when the number after the decimal repeats you have to put a line over it to state it is repeating, but what if its like this?

0.26666667

what do you do with the 7 at the end??
help

2007-12-18 10:25:57 · 4 answers · asked by Anonymous in Mathematics

A 5 kilogram wooden block, is placed on an adjustable wooden inclined plane.
a.) What is the angle of inclination above which the block will start to slide down the plane.
b.) At what angle of inclined will the block then slide down the plane at a constant speed.

Thanks

2007-12-18 10:25:51 · 2 answers · asked by ♥♫♪ The Cool one ♥♫♪ 2 in Physics

A child and sled with a combined mass of 48.6 kg slide down a frictionless hill that is 8.02 m high. If the sled starts from rest, what is its speed at the bottom of the hill?

and

A person doing a chin-up weighs 755 N, disregarding the weight of the arms. During the first 25.0 cm of the lift, each arm exerts an upward force of 381 N on the torso. If the upward movement starts from rest, what is the person's speed at this point?

2007-12-18 10:24:42 · 1 answers · asked by Anonymous in Physics

please help answer any of the 3 quesitons thank you

1. A 2.38 kg mass with an initial velocity of
v
1 = aˆı, where a = 3.67 m/s collides with
and sticks to a 2.89 kg mass with an initial
velocity of v1 = bˆj, where b = −4.8 m/s.
Find the final speed of the composite mass.
Answer in units of m/s.

2. Three point mass particles are located in a
plane:
4.25 kg located at the origin,
7.2675 kg at [(6.24 cm), (12.48 cm)],
and 3.02175 kg at [(18.6576 cm), (0 cm)].
How far is the center of mass of the three
particles from the origin? Answer in units of
cm.

3. A(n) 17 kg ob ject, initially at rest in free
space, “explodes” into three segments. The
masses of two of these segments are both 6 kg
and their velocities are 6.3 m/s. The an-
gle between the direction of motion of these
segments is 46 degrees.
What is the speed of the third segment?
Answer in units of m/s.


PLEASE SHOW WORK SO I CAN LEARN IT

THANK YOU

2007-12-18 10:23:05 · 1 answers · asked by mimi j 1 in Physics

I know Earth's rotation affects the seasons, but does Earth's revolution around the sun affect the seasons?

2007-12-18 10:22:34 · 29 answers · asked by jamie68117 3 in Astronomy & Space

A 65.0 kg diver steps off a diving board and drops straight down into the water. The net force when in the water is an upward 1250 N. If the diver comes to rest 4.0 m below the water's surface, what is the total distance between the diving board and the diver's stopping point underwater?

2007-12-18 10:21:04 · 1 answers · asked by Anonymous in Physics

Why do high heels give more pressure than work boots?

2007-12-18 10:15:30 · 4 answers · asked by Anonymous in Other - Science

2007-12-18 10:15:04 · 1 answers · asked by Anonymous in Biology

A 40.0 cm diameter wheel accelerates uniformly from 205 rpm to 395 rpm in 6.0 s. How far will a point on the edge of the wheel have traveled in this time?
in meters

2007-12-18 10:12:56 · 2 answers · asked by joe s 1 in Physics

1.20 fl oz. = ____ cups.
2.7920 ft = ____mi

Is each measurement reasonable? If not, give a reasonable measurement.
1. A glass of milk holds about 8 pt.
2. A phonebook is 3/4 ft wide

Choose an appropiate unit of measure. Explain you choice.
1. weight of a whale
2. sugar in a cookie recipe
3. length of a mouse

2007-12-18 10:12:55 · 1 answers · asked by Anonymous in Mathematics

2007-12-18 10:12:17 · 26 answers · asked by How To Save A Life 2 in Astronomy & Space

meaning, animal that is really brave, courage, w/ pride but emotionally soft

2007-12-18 10:10:18 · 5 answers · asked by bigbird1427 2 in Zoology

2007-12-18 10:08:10 · 1 answers · asked by msj2uk 3 in Zoology

i just need some idea's im doing a venn diagram and i need atleast five things tornados and hurricanes have in common. thanks!

2007-12-18 10:03:26 · 5 answers · asked by Anonymous in Weather

2007-12-18 09:59:36 · 4 answers · asked by rory2ryan 1 in Biology

(A)Two students on roller skates stand face to face then push each other away. One student has a mass of 96kg and the other student has 60kg.

Find the ratio of the magnitude of the first student's velocity to the magnitude of the second student's velocity.

(B) A 2080 kg car moving east at 10.1 m/s collides with a 3270 kg car moving 3.99m/s east. The cars stick together and move east as a unit after the collision at a velocity of 6.27 m/s.

What is the decrease in kinetic energy during the collision in units of m/s?

2007-12-18 09:59:35 · 3 answers · asked by Catalina 2 in Physics

2007-12-18 09:58:57 · 21 answers · asked by -x-lollie-x- 1 in Mathematics

I have a project in Physics about The Day After Tomorrow. And my group was assigned to talk about the tsunami scene. We have to talk about how they form and stuff.
Itd be cool to mention something about Alfred Wegener since this is about plate tectonics, and my last name is Wegener. I asked my father about a long time ago and hes out of town so i cant talk to him about this.

2007-12-18 09:56:25 · 2 answers · asked by me yo 2 in Geography

for a project. need answers ASAP!

2007-12-18 09:51:08 · 1 answers · asked by Megan 2 in Zoology