Science & Mathematics - 15 October 2007

Since Lot of Probes Are Lost. Presumably Destroyed By The Aliens

2007-10-15 17:34:29 · 6 answers · asked by engelfeurs 2 in Astronomy & Space

A cannon with a muzzle speed of 995 m/s is used to start an avalanche on a mountain slope. The target is 2000 m from the cannon horizontally and 809 m above the cannon. At what angle, above the horizontal, should the cannon be fired? (Ignore air resistance.)
what degree?

2007-10-15 17:33:36 · 1 answers · asked by Anonymous in Physics

express each ratio as unit rate:

625 miles in 9 days

116 meters in 12 seconds

176 new employees in 22 years

34 yards for 6 costumes ?

55 pages in 25 minutes

$3015 from 36 people

HELP PLEASE! I WILL DEARLY APPRECIATE IT! this is my homework & i don't get it & its due tomorrow! thanks!

2007-10-15 17:33:19 · 2 answers · asked by jmacsgirlie75 2 in Mathematics

Thermochem. Problem?
im working on a series of problems that are based off each other, ive got the first 2 correct but i cant seem to solve the third.

When 3.5g of sodium hydroxide (NaOH) was dissolved in 100g of water a value of 10.5oC was obtained for ΔT.

1. [1pt]
Calculate the molarity of the sodium hydroxide solution.
Correct: 0.875

2. [1pt]
Calculate the heat (calories) produced by the solution of 3.5 g of NaOH.

Correct: -1032.4125



3. [1pt]
Calculate the number of calories that would be produced if one mole of sodium hydroxide was dissolved. (ΔHsolnNaOH)


#3 is the one i cant solve, i think i have to do a ratio but it doesnt take my answer i seem to get or -1179.9 as answers but it doesnt take it.

2007-10-15 17:06:56 · 1 answers · asked by mzglobicki2 1 in Chemistry

in other words... If we start with a cell that has 24 chromosomes or 12 pairs, how many chromosomes will be found in the two cells that are produced at the end of the cell cycle?

2007-10-15 17:06:54 · 3 answers · asked by bjagd02 1 in Biology

I want to write an article of how to conserve our water and send it to the Editor of our big nespaper as an idea to publish to help our city survive and stretch our main water source until it rains this winter.
If you have some ideas, please share them,
(like the 3 to 5 minute shower instead of 30 minutes under the tap!)
and please read the ones before you so we dont' have a bunch of repeat ideas.
Thanks!

2007-10-15 17:06:44 · 3 answers · asked by susieque 4 in Earth Sciences & Geology

A Rocket is tracked by a radar station 6 miles away. When the rocket is 4 miles high its velocity is .5 miles/second. What is the rate of change of the angle.

2007-10-15 16:57:51 · 1 answers · asked by robscianni 1 in Physics

It says:
2y-a/3=a+3b/4

and one that says:

Two airplanes leave Dallas at the same time and fly in opposite directions. One airplane travels 80 mph faster than the other. After three hours, they are 2940 miles apart. What is the speed of each airplane?

PLEASE HELP ME!!!!!

2007-10-15 16:57:28 · 4 answers · asked by JesusFreak777 2 in Mathematics

2007-10-15 16:54:16 · 4 answers · asked by Apo B 1 in Biology

Explain in terms of entropy.

2007-10-15 16:51:15 · 3 answers · asked by Elerth Morrow ™ 5 in Biology

2007-10-15 16:49:40 · 5 answers · asked by Anonymous in Earth Sciences & Geology

2x(squared)+8x+6

3x(squared)-12x+9

4x(squared)-x-14

2007-10-15 16:48:41 · 5 answers · asked by Arête 3 in Mathematics

2007-10-15 16:42:51 · 9 answers · asked by Oscar 1 in Mathematics

I've Already Answered the First Part Of the Question.

In this question I have already answered the "when are the roots complex part."
When I take the discriminant out of the quadratic formula and plug the formula in; I find that all discriminant results that are less than 0 result in a complex number.

But I am at a loss of how to sketch this?

Is it an odd circle shape on the complex plane or something?

2007-10-15 16:42:48 · 5 answers · asked by ? 3 in Mathematics

a pessenger jet in the air increases its speed does the downward force of air on the top of te wings

increase or decrease? does the net lifting force of the air on the wing increase or decrease? (Explain)

2007-10-15 16:39:35 · 1 answers · asked by playboy_kardy25 1 in Physics

I'm stuck on these problems. I know the answer. Just not how to get there. Please help!

1.) x^3 + 4x^2 - 3x - 2 = 0

2.) 16x^4 - 4x^3 - 16x^2 + x + 3 = 0

3.) 3(square root ->3x+14) = 15 - 2 | x - 2 |

WILL GIVE BEST ANSWER.

2007-10-15 16:39:09 · 1 answers · asked by charmedrules10 2 in Mathematics

This is the dream of many on earth. It is the dream spoken of in fables and myths. It is the dream shown only in the movies.

Will it be really possible for us to build a flying car? A flying car like the one seen in the movie Chitty Chitty Bang Bang?

2007-10-15 16:37:39 · 5 answers · asked by Forward 6 in Engineering

..

2007-10-15 16:36:46 · 9 answers · asked by Nicole W 2 in Biology

I don't know but can you explaing why the Alkali metals form cations having a charge of +1 when they react.

My other question is why Halogens form anions having a charge of -1 when they react

Thank you

2007-10-15 16:35:37 · 1 answers · asked by Anonymous in Chemistry

2007-10-15 16:35:26 · 4 answers · asked by Anonymous in Earth Sciences & Geology

Latest scientific theory revolutionizes creation theories.

2007-10-15 16:34:42 · 4 answers · asked by Robert S 7 in Astronomy & Space

Hey guys. I need help with my AP Human Geography Homework. I've looked everywhere for the answer, but I can't find it. Anyway, here's the question, "After WWII, the Soviet Union took over all or a portion of what seven European countries?" Thanks for you help!!

2007-10-15 16:32:08 · 3 answers · asked by ishtar_hecate 2 in Geography

2007-10-15 16:30:12 · 5 answers · asked by jermaine t 1 in Biology

2007-10-15 16:28:07 · 3 answers · asked by houstonman20042002 1 in Mathematics

I am wondering if a coiled ribbon type spring has equal the storage potential, or greater, then let's say a rod coil spring, such as what is used on automobile suspensions.

2007-10-15 16:27:29 · 1 answers · asked by sportsman72901 2 in Physics

PLEASE HELP....IM SO NEW TO THIS SUBJECT IVE READ SO MANY ARTICLES AND I NEEED TO DO A ESSAY AND ITS DUE TOMORROW!! THANKS YOU VERY MUCH!!!!

2007-10-15 16:25:55 · 2 answers · asked by Anonymous in Earth Sciences & Geology

Suppose the spring has a spring constant of 492 N/m and the box has a mass of 2.0 kg. The speed of the box just before it makes contact with the spring in 0.36 m/s.

What is the magnitude of the spring's displacement when the spring is fully compressed?

2007-10-15 16:25:40 · 1 answers · asked by txsweetpea512 1 in Physics

2007-10-15 16:24:49 · 2 answers · asked by Terri L 2 in Biology

2007-10-15 16:23:37 · 9 answers · asked by Terri L 2 in Biology

The reference book im reading is not the same as what my teacher says and im confused now

2007-10-15 16:23:22 · 3 answers · asked by Dabidu 4 in Earth Sciences & Geology