Science & Mathematics - 19 October 2006

2006-10-19 17:21:57 · 8 answers · asked by Anonymous in Botany

2006-10-19 17:20:57 · 5 answers · asked by Anonymous in Biology

The length of a card is three times as long as its width. The perimeter is 264 inches. What are the dimensions of the card?

2006-10-19 17:18:20 · 10 answers · asked by Anonymous in Mathematics

I've been given the following "Digits" are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

How many 3 digit strings are there..
if any digit is allowed in any place?
if the digits are all different?
that do not start with 0 but can have any digit in the other places?
that start and end with different digits?
that have two or three digits that are the same?
the sum of whose digits is divisible by 9?
that have at least one 3?
that have at least one odd digit?

2nd part

How many strings of 9 upper-case English letters are there..
*if letters can be repeated?
if no letter can be repeated?
that start with Q, if letters can be repeated?
that start with Q, if no letter can be repeated?
that start with Q and end with X, if letters can be repeated?
that start with Q and end with X, if no letter can be repeated?
that start and end with a vowel (A, E, I, O, U), if letters can be repeated, also if they can't be repeated???

2006-10-19 17:13:44 · 2 answers · asked by bsj 1 in Mathematics

2006-10-19 17:11:09 · 8 answers · asked by MJ 1 in Mathematics

Three masses located on a x - y plane have the following coordinates; a 5 kg mass has coordinates given by (2, -3) m; a 4 kg mass has coordinates (-4, 2) m; a 2 kg mass has coordinates (3, 3) m. Find the coordinates of the center of mass to two significant figures. Explain how you got your answer.

2006-10-19 17:10:30 · 3 answers · asked by Anonymous in Physics

need to know an easier way to find the wavelength and frequency than the book tells me how to do it. 11th grade chemistry honors class.

2006-10-19 17:10:01 · 7 answers · asked by ariley725 1 in Chemistry

I mean, nobody can see Pluto. It's just a small icy rock on the outer part of the solar system. There are moons and asteroids that are easier to see with a telescope than Pluto. Why would anyone care if Pluto is no longer considered a planet? Why this attachment to something they have never seen?

Any chance Yahoo can just set up a canned response that says, "Pluto is now considered a Kuiper Belt Object rather than a planet" whenever this question comes up? Nah, I suppose not....

2006-10-19 17:09:24 · 14 answers · asked by Anonymous in Astronomy & Space

2006-10-19 17:09:08 · 2 answers · asked by E-man 1 in Medicine

need the answer ASAP!

2006-10-19 17:05:30 · 2 answers · asked by Red Panda 6 in Chemistry

2006-10-19 17:03:57 · 12 answers · asked by TehEagle 1 in Physics

And if Newton theory of gravitation was not exact ,why did Einstein use His Universal G constant in his Field Equation expression?

2006-10-19 17:03:05 · 3 answers · asked by goring 6 in Physics

2006-10-19 16:58:43 · 6 answers · asked by David H 4 in Astronomy & Space

2006-10-19 16:53:59 · 4 answers · asked by Anonymous in Geography

http://i22.photobucket.com/albums/b338/ravenatic520/Acertainnucleus.jpg
A certain nucleus, at rest, transforms into three particles. Two of them are detected; their masses and velocities are shown in the above link. (a) In unit-vector notation, what is the translational momentum of the third particle, with a mass of 11.7*10^-27 kg?

2006-10-19 16:53:25 · 2 answers · asked by Anonymous in Physics

2006-10-19 16:53:12 · 16 answers · asked by Adam 1 in Chemistry

2006-10-19 16:51:43 · 6 answers · asked by David H 4 in Geography

find any points of discontinuity of the functions in problems. Specify whether or not the discontinuity is removable. Use N for "non0rmovable" and R for "removable"

2006-10-19 16:50:02 · 4 answers · asked by MJ 1 in Mathematics

2006-10-19 16:48:23 · 5 answers · asked by .::EZ::. 2 in Earth Sciences & Geology

2006-10-19 16:48:00 · 9 answers · asked by Anonymous in Geography

ok im trying to help my little cousin on her algebra hw, but i got stuck on this one, can any of you please help us??!!But just give us the equations to solve it and we'll be ok...THANKS!! ok heres the problem:
A postal clerk sold some fifteen-cent stamps and some twenty-five cent stamps. Altogether, 10 stamps were sold for a total cost of $1.70. How many of each type of stamp were sold?

2006-10-19 16:46:19 · 15 answers · asked by Crystal 2 in Mathematics

I am looking to purchase relatively large slabs of black obsidian. I need these for a project, to experiment with the Stone Age methods of knapping. My idea is to see if it is possible to produce a long blade-like implement from obsidian, and to see if such an implement would be as effective as a contemporary steel machete in crop harvesting.

This will allow me to infer a bit about ancient agricultural techniques, most specifically those for clearing land.

2006-10-19 16:42:58 · 2 answers · asked by Anonymous in Earth Sciences & Geology

A 4.5 kg dog stands on an 18 kg flatboat, and is 6.1 m from the shore. He walks 2.4 m along the boat towards the shore, and then stops. Assuming there is no friction between the boat and water, find how far the dog is from the shore.

Imagine the dog moves leftward and the boat moves rightward, but does the center of mass of the boat + dog system move?

2006-10-19 16:41:47 · 4 answers · asked by Anonymous in Physics

2006-10-19 16:40:14 · 12 answers · asked by Anonymous in Geography

2006-10-19 16:39:44 · 5 answers · asked by Anonymous in Biology

2006-10-19 16:38:28 · 12 answers · asked by Julia Z 2 in Chemistry

Enter the equation that represents the problem.

2006-10-19 16:37:27 · 7 answers · asked by chokala 1 in Mathematics

2006-10-19 16:35:38 · 10 answers · asked by Miss Terry 1 in Other - Science

There is a maximum depth at which a diver can breathe through a snorkel tube because as the depth increases, so does the pressure difference, tending to collapse the diver's lungs. Since the snorkel connects the air in the lungs to the atmosphere at the surface, the pressure inside the lungs is atmospheric pressure.

What is the external-internal pressure difference (in Pa) when the diver's lungs are at a depth of 6.1 m (about 20 ft)? Assume that the diver is in fresh water. (A scuba diver breathing from compressed air tanks can operate at greater depths than can a snorkeler, since the pressure of the air inside the scuba diver's lungs increases to match the external pressure of the water.)

2006-10-19 16:35:17 · 2 answers · asked by Anonymous in Physics

How do you determine this when given a list of elements? Please help!!!

2006-10-19 16:34:43 · 6 answers · asked by SuperCee 2 in Chemistry