Science & Mathematics - 8 January 2007

I need as many answers to the following as possible. Thanks!!!
-equation for volume
-SI unit for density
-equation of density
-characteristics of the bonds of the four types of matter
-how would you determine a wave's speed
-what are the two terms used for the columns in the periodic table? how many columns are there?
-What is the term for the rows? how many are there?
-period number of the actinides and lanthanides
-what is the charge of a molecular compound>
-what is magnesium's most common ion? how do you find that?
-what are the bond angles for these molecular shapes: trigonal bent and tetrahedral bent
-what determines whether a compound is polar or not?

Thank you sooo much!!

2007-01-08 11:44:14 · 5 answers · asked by Anonymous in Chemistry

2007-01-08 11:43:50 · 1 answers · asked by strbrst_2011 1 in Earth Sciences & Geology

Does light(photons) have 0 mass or infinite?(b/c it its mass would be zero, it would take no energy to slow it down, meaning, it wouldn't be traveling, unless it has infinite mass which means that it can't be slowed down even a bit but that contradicts the theory that it does have 0 mass)

2007-01-08 11:42:27 · 4 answers · asked by Anonymous in Physics

help please!

2007-01-08 11:42:02 · 8 answers · asked by Ryan T 1 in Earth Sciences & Geology

When you double a number and add five, the result is three less than twice the number. What is the number?

2007-01-08 11:40:16 · 6 answers · asked by yowezz20 1 in Mathematics

e as in the button on your calculator

2007-01-08 11:39:57 · 2 answers · asked by Anonymous in Mathematics

If you scrape off the powder on matches and packed it thightly into a copper pipe with both ends closed thightly using copper caps, would the ignition of match powder (using a fuse) be strong enough to burst through the copper pipe?

2007-01-08 11:38:33 · 5 answers · asked by Sliceathroat 3 in Chemistry

2007-01-08 11:37:18 · 10 answers · asked by jdm8090 2 in Astronomy & Space

2007-01-08 11:37:12 · 1 answers · asked by dookie 1 in Other - Science

a. 1.
b. 2.
c. 3.
d. 4.

2007-01-08 11:36:41 · 1 answers · asked by Anonymous in Chemistry

Can someone provide a simple and convincing reason why mass dosen''t always add when two system combine but momentum and energy always does?

Energies and momentum add because of conservation laws but mass is conserved as well isn't it?

Or is it the case that we are dealing with invariant mass hence is special? This sounds a bit mystical.

2007-01-08 11:36:32 · 2 answers · asked by Anonymous in Physics

A clock gains 3 minutes every hour.If the clock is set correctly at midnight on January 1,when will it next show the correct time ?

2007-01-08 11:35:49 · 6 answers · asked by pinky 1 in Mathematics

Problem: 6 different numbers are chosen from the set {1, 2, 3, ..., 44}. The winning numbers are drawn from this set. To win, all 6 numbers must be matched in any order.

Question: What is the probability of winning, P(winning)?

Note: You may use nCr and/or nPr in your answer. Please explain thoroughly.

I genuinely appreciate all and any effort.

2007-01-08 11:35:38 · 2 answers · asked by Esse Est Percipi 4 in Mathematics

2007-01-08 11:34:37 · 8 answers · asked by vicky-voos 1 in Chemistry

Simplify: 7/8+1/2 x 3/10.

2007-01-08 11:34:10 · 9 answers · asked by sticinoutt 1 in Mathematics

2007-01-08 11:33:14 · 6 answers · asked by time4c0rime 1 in Biology

ok this is a class thing so i need an answer ..... i would really appreciate if i could have a true answer........... this could bring me down

2007-01-08 11:33:08 · 7 answers · asked by me 1 in Zoology

math problem i have homework

2007-01-08 11:31:42 · 8 answers · asked by tigerbusinessad 1 in Mathematics

I read somewhere that for something near a black hole time slows down. What could cause this? and why is it that time slows down near to huge gravity fields, and time speeds up for an object travelling close to the speed of light?

2007-01-08 11:31:27 · 12 answers · asked by Anonymous in Physics

See previous details for constraints

In many answers, I see you are you are assuming that the plane is not flying, or cannot fly. Cannot take off, Or that the box is too small etc. I will clarify some more.

How about this.... The weightless box is full of air, is the size of texas, has weather etc, and could be lifted by the airplane if the airplane were flying outside of the box...

2007-01-08 11:30:16 · 6 answers · asked by John R 2 in Physics

His Conjecture is that every even number greater than 2 can be written as the sum of two primes. Prove it wrong.

for example 6=3+3 8=5+3 16=13+3

2007-01-08 11:29:22 · 8 answers · asked by Christian G 2 in Mathematics

2007-01-08 11:29:14 · 2 answers · asked by Amy 2 in Earth Sciences & Geology

2007-01-08 11:28:59 · 3 answers · asked by shiva 1 in Engineering

2007-01-08 11:28:24 · 10 answers · asked by dilmo 1 in Mathematics

if a wheel rotates once along the ground and travels 3ft 3.3/8".how many times does it rotate in one mile.and if another wheel rotates once along the ground and travels 3ft how many times does it rotate in one mile.

2007-01-08 11:28:16 · 3 answers · asked by tugboat 4 in Mathematics

2007-01-08 11:25:59 · 6 answers · asked by Anonymous in Mathematics

it says ....some relatively simple eukaryotes, such as the adder's tongue fern, may have many more chromosomes than a more complex eukaryote, such as a mammal. what might this suggest about the size and organization of chromosomes in different species?

2007-01-08 11:25:23 · 3 answers · asked by nixsie 2 in Biology

2007-01-08 11:24:00 · 3 answers · asked by clock 2 in Mathematics

2007-01-08 11:23:10 · 4 answers · asked by Anonymous in Earth Sciences & Geology

Will the whole world eventually be on one very huge network ?

2007-01-08 11:22:57 · 7 answers · asked by Anonymous in Other - Science