Science & Mathematics - 27 November 2007

and Johannes Kepler. Begin by explaining why Tycho rejected the Copernican system. Pick up the story with Kepler emphasizing his connection with Tycho, and how he improved upon the Copernican model. You should address the following questions: What different assumptions did Kepler make? What did he have to work with that Copernicus did not? How did that help?

2007-11-27 14:34:29 · 1 answers · asked by sojo3 1 in Astronomy & Space

example: -3x + 2y = 8. if a negative x term is not correct, what should i do instead?

2007-11-27 14:34:09 · 6 answers · asked by Ash 1 in Mathematics

An auto race is hed on a track. A car completes one lap in a time of 18.9s with an average tangential speed of 42.6m/s. Find the average angular speed and the radius of the track.

2007-11-27 14:33:58 · 1 answers · asked by Anonymous in Physics

a screen containing 2 slits 0.100 mm apart is 1.2 m from th viewing screen. LIght of wavelength is 400 nm *violet light* falls on the slits from a distant source.
a. approx how far apart will the interference fringes be on the screen?
b. if instead wavelength= 700 nm *red lights* how far apart will interfernece fringes be?
c. describe what would be seen if white light was used ?

please help test tomorrow

2007-11-27 14:32:36 · 2 answers · asked by Anonymous in Physics

According to Einstein, the speed of light can "neither be reached nor exceeded by any real body."

Why are photons so special that they get to go that fast?

2007-11-27 14:32:20 · 4 answers · asked by John K 3 in Physics

i really need it for my essay that is due tomarrow

2007-11-27 14:31:23 · 8 answers · asked by Anonymous in Zoology

they were found cloned and put into the world today? what do you expect a real size to be and why would they not just blow up if they could breath fire?

I just figure I'd ask this in zoology because it is a diffrent croud.

and this is only ASSUMING they exsisted.

most discriptive answer gets 10 pts

2007-11-27 14:31:16 · 7 answers · asked by DRAGON 5 in Zoology

A. Mitochondria for energy for the virus
B. Liposomes to isolate themselves from water
C. Food particles
D. Viral particles

2007-11-27 14:30:23 · 5 answers · asked by Jennifer E 1 in Biology

A superball with a mass of 47.3g is dropped from a height of 3.6m. it rebounds to a height of 3.2m.?
The acceleration of gravity is 9.8m/s/s. What is the change in its linear momentum during the collision with the floor? Answer in units of kg m/s.

2007-11-27 14:26:54 · 1 answers · asked by njbadboy4life2005 3 in Physics

2007-11-27 14:25:44 · 4 answers · asked by aimers 2 in Astronomy & Space

2007-11-27 14:24:59 · 25 answers · asked by Drunvalo 3 in Astronomy & Space

what do the titles
d4, d5, d8, etc stand for and how do you find them??

for example, in my txt book it says that
Cr(H2O)6 (3+) is d5

Thank you!

2007-11-27 14:24:09 · 2 answers · asked by Anonymous in Chemistry

Two particles, of masses m and 3m, are moving toward each other along the x-axis with the same initial speeds of 7.27 m/s. Mass m is travelling to the left, and mass 3m is traveling to the right. They undergo a head-on elastic collision and each rebounds along the same line as it approached.

Find the final speed of the heavier particle. answer in m/s

i have no idea what to do.

2007-11-27 14:24:00 · 1 answers · asked by njbadboy4life2005 3 in Physics

Do you think there is life out there that, through technology beyond our comprehension, is aware of the existence of humans on the planet Earth?

When you really think about it, is it that crazy an idea?

2007-11-27 14:23:48 · 10 answers · asked by Zezo Zeze Zadfrack 1 in Astronomy & Space

It's a pre-calculus question

2007-11-27 14:23:23 · 1 answers · asked by Raquel - 3 in Mathematics

As [Ar] 4s2 3d10 4p3

2007-11-27 14:22:44 · 1 answers · asked by Edward 2 in Chemistry

a wind blowing from the southwest exerts a 213-pound force on a sailboat that is on a heading of 85 degrees. Find the vector that represents the force propelling the boat, and its norm.

2007-11-27 14:22:21 · 1 answers · asked by CP 3 in Mathematics

Okay, so here's the problem, and I've tried EVERYTHING. I just don't understand it!

How much force do you need apply to the (horizontal) top of a box to push it over?

The box is 27kg, is 1.3 m tall and is .83 m long. Any help?

2007-11-27 14:21:40 · 4 answers · asked by motelman94 1 in Mathematics

2007-11-27 14:19:47 · 1 answers · asked by Anonymous in Chemistry

A ball player hits a home run, and the baseball just clears a wall 8.00 m high located 132.8m from the home plate. The ball is hit at an angle of 38.8 degrees to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1.1 m above the ground. The acceleration of gravity is 9.8 m/s^2.

What is the initial speed of the ball in units of m/s?

How much time does it take for the ball to reach the wall in units of seconds?

Find the speed of the ball when it reaches the wall. Answer in units of m/s

2007-11-27 14:17:28 · 1 answers · asked by Anonymous in Physics

2007-11-27 14:14:29 · 3 answers · asked by Anonymous in Mathematics

My son is a grad student in analytical chemistry at the U of Minn-Twin Cities and he recently published his first article in the "Analytical Chemistry Journal." They accepted the article exactly the way he wrote it! NO revisions, NO editing, NO changes! It's in this month's volume. No one, including myself, has ever heard of that! Have you?

He's been working on tips for STM and came up with something better and cheaper than any one else before.

No correct answers for this. Just bragging about my first born to people who might know something about STM. Sorry if you don't approve the use of this medium to do that. I'm just so proud!

2007-11-27 14:13:54 · 2 answers · asked by ThisIsIt! 7 in Physics

2007-11-27 14:13:02 · 3 answers · asked by Ed D 1 in Geography

Ok so my science class is doing this project where we have to find the physical science of things. Like for example what's physical of an electric toothbrush or like the physics of how a scyscraper is built. What im having trouble finding is the physics of an owl flying. Like what's physical about that? The way it flaps it's wings? Please help i need this.

2007-11-27 14:12:34 · 1 answers · asked by Scented Marker 2 in Engineering

Arite the question title was kinda lame. leme explain it.. i wana know why sometimes the heartbeat increases all of a sudden even if you are just sitting doing nothing? It usually happens to me and afterwards my skin goes dead pale .. it lasts only for a while though, any ideas?

2007-11-27 14:12:28 · 3 answers · asked by ●๋• illSting ●๋• 3 in Medicine

There are, of course, zillions of prophecies and silly ideas about the year 2012.

But is there any scientific basis to the idea of a 'polar shift' or something to do with the Earth's magnetic field?

Thanks!

2007-11-27 14:12:25 · 6 answers · asked by Zezo Zeze Zadfrack 1 in Astronomy & Space

does anyone know when the 4th season of ghost hunters comes on? i know it's probabley in 2008 but what month mayb what day? thanx 4 answering!!!

2007-11-27 14:09:43 · 7 answers · asked by animallover 2 in Paranormal Phenomena

it's not for homework but i am trying to get a better idea of it because i don't really understand it. My teacher just taught us it in class today but to get a better idea of it i looked it up online and everything is so detailed.

I just want to know:
- the basic idea
-and how you draw dot structures of molecules or ions using it

2007-11-27 14:09:35 · 1 answers · asked by MusicLuvr 5 in Chemistry

2007-11-27 14:08:48 · 4 answers · asked by darkliquid_dreams 2 in Geography

2007-11-27 14:07:28 · 2 answers · asked by atljasmine4 1 in Chemistry