Science & Mathematics - 20 November 2007

Which ones are true?

1. The Moon lost its atmosphere because of its low gravity.
2. The We think the Earth and Moon are both about 4.6 billion years old.
3. The Earth has an atmosphere of nitrogen and oxygen because of the processes of life and death.
4. Differentiation in the early molten Earth caused heavier elements like iron to sink while the lighter elements and rocks stayed on the surface.
5. Tides on the Earth have slowed its rotation.
6. At the present time the main heat source for the Earth's core is radioactivity.

2007-11-20 12:57:15 · 10 answers · asked by Angelical Abby 4 in Astronomy & Space

Find the lcd help!!!?
find the lcd for the list of rational exprssions

4/x^2+8x+12, 2x-7/x^2-x-6

2007-11-20 12:56:19 · 3 answers · asked by Anonymous in Mathematics

roberto bought 3 stamps. in how many different ways can 3 stamps be connected to each other explain?

2007-11-20 12:55:32 · 5 answers · asked by Anonymous in Mathematics

HELP!!!!!

2007-11-20 12:51:52 · 6 answers · asked by Anonymous in Geography

The measure of an angle is 3 times the measure of its supplement.

Can anyone explain to me how to solve this and what the answer is? Thank you!

2007-11-20 12:51:04 · 8 answers · asked by Kelly 3 in Mathematics

2007-11-20 12:50:58 · 5 answers · asked by STUDY 3 in Physics

Please explain

2007-11-20 12:50:22 · 4 answers · asked by Bobby S 3 in Mathematics

I've heard it's a good insulator but how could that be if snow is cold. ???

2007-11-20 12:48:36 · 3 answers · asked by Anonymous in Weather

A 56.0 kg ballet dancer stands on her toes during a performance with four square inches (26.0 cm2) in contact with the floor. What is the pressure exerted by the floor over the area of contact in the following cases?(a) if the dancer is stationary(b) if the dancer is leaping upwards with an acceleration of 5.00 m/s2

2007-11-20 12:45:18 · 1 answers · asked by Anonymous in Physics

an ideal spring of unstretched length .2 m is on a frictionless table. One end is fixed on wall and other is attached to mass M=8kg. M is attached to string over pulley and block of mass m=4kg hangs from other end of string. In equilibrium, length of spring is .25m and m is .7m above the floor.
Calculate tension in string
Calculate force constant of spring

2007-11-20 12:45:07 · 1 answers · asked by rachhar123 1 in Physics

that number?

2007-11-20 12:44:26 · 6 answers · asked by Anonymous in Mathematics

It's a math question on this packet I'm given over thanksgiving. There's fifty questions and I don't understand/can't find the answer for five of them. =/

I'd really appreciate the help!

2007-11-20 12:42:41 · 5 answers · asked by Steph 2 in Mathematics

2007-11-20 12:42:27 · 3 answers · asked by STUDY 3 in Physics

2007-11-20 12:41:06 · 1 answers · asked by hulkholgan21 1 in Physics

2007-11-20 12:39:27 · 4 answers · asked by AMTRAK 2 in Biology

the equation is y = - ln x. I keep on getting -e^y=-x and i keep getting the x intercept is (1,0). My book says it's (-1,0). How do you get it algebraically? Thx!

2007-11-20 12:38:54 · 1 answers · asked by Service_Ace 1 in Mathematics

Would it appear as large as our moon does in our sky?

2007-11-20 12:38:40 · 3 answers · asked by Professor Armitage 7 in Astronomy & Space

there are only two please help me. :)

http://i230.photobucket.com/albums/ee247/memorex456/scan0002.jpg

http://i230.photobucket.com/albums/ee247/memorex456/scan0001.jpg

2007-11-20 12:34:19 · 5 answers · asked by Reden 2 in Mathematics

A 71.0 kg diver steps off a diving board and drops straight down into the water. The net force when in the water is an upward 1440 N. If the diver comes to rest 4.7 m below the water's surface, what is the total distance between the diving board and the diver's stopping point underwater?

(answer in meters)

2007-11-20 12:33:15 · 1 answers · asked by JJ 1 in Physics

A 60 kg ice skater moving to the right with a velocity of 3m/s throws a 0.150 kg snowball to the right with a velocity of 30m/s relative to the ground.
What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and the ice. Answer in units of m/s.
-----------------------------------------------------------------------------------
A second skater initially at rest with a mass of 58kg catches the snowball.
What is the velocity of the second skater after catching the snowball in a perfectly inelastic collision? Answer in units of m/s


Help on this would be much appreciated, thanks in advance!!!

2007-11-20 12:33:14 · 1 answers · asked by Anonymous in Physics

2007-11-20 12:32:16 · 1 answers · asked by Kiko Z 1 in Physics

2007-11-20 12:29:02 · 4 answers · asked by luv2bfit 5 in Weather

An object of a given weight is pulled at a constant velocity with a given force by a rope that makes a given angle of with the horizontal. Calculate (a) the
horizontal component of the force exerted by the rope and (b) the force of friction between the sled and the ground.

2007-11-20 12:26:29 · 1 answers · asked by Anonymous in Physics

the videos i saw didn't leave that bit of info

2007-11-20 12:25:11 · 5 answers · asked by Anonymous in Zoology

2007-11-20 12:25:01 · 2 answers · asked by Anonymous in Mathematics

I've searched lots and can't find sites on tiger body parts. It's really annoying and i didn't know what to do.
So i came here to ask if anyone knows any sites that talk about tiger body parts because i need it for my homework.
It would be really helpful if someone got me a site where it talks about each of the tiger body parts(Ex: eye, legs, mouth, tail, nose)

2007-11-20 12:22:53 · 3 answers · asked by Anonymous in Zoology

(b-7) squared


(-1 + 5a) squared

Nsquared - 8n + 16

and...

49xsquared + 56x +9

*Don't tell me I should be doing these myself...If someone tells me the answers to these four problems, I will be able to do the rest of them

Thanks!

2007-11-20 12:20:11 · 5 answers · asked by wavves 4 in Mathematics

I keep on hearing about how people go directly into medical school after high school, and im just wondering why we dont do the same? I mean i know technically you dont have to have a degree to get into medical school except for the class requirements and i think at least 90 hours. what is the point of this? its a waste of money, and a waste of time. ideally you should have a degree before applying to medical school and i think this just puts up so many challenges for a lot of people who, if they could, be really good doctors.

2007-11-20 12:18:50 · 4 answers · asked by Anonymous in Medicine

I'm on Mars.

2007-11-20 12:18:04 · 7 answers · asked by Anonymous in Physics

1. In convex hexagon ABCDEF, all six sides are congruent, A and D are right angles, B and C and E and F are congruent. The area of the hexagonal region is 2116((square root of 2) + 1) Find AB.

2. Find the number of ordered pairs of positive integers (a,b) such that a + b = 1000 and neither a nor b has a zero digit.

3. When rolling a certain unfair six-sided die with faces numbered 1, 2, 3, 4, 5, and 6, the probability of obtaining face F is greater than 1/6, the probability of obtaining the face opposite is less than 1/6, the probability of obtaining any one of the other four faces is 1/6, and the sum of the numbers on opposite faces is 7. When two such dice are rolled, the probability of obtaining a sum of 7 is 47/288 . Given that the probability of obtaining face F is m/n where m and n are relatively prime positive integers, find m+n

These are not my homework. they are problems from hmmt, if you can solve these, you should be proud of yourself.

2007-11-20 12:13:56 · 6 answers · asked by Air Jersey 2 in Mathematics