Science & Mathematics - 3 December 2007

just imagine if the sun's light was a constant(no day and night) we would easliy lose track of time, would't it be great!

2007-12-03 09:02:56 · 5 answers · asked by trphuong 1 in Astronomy & Space

1. indicates the shell to which the subshell belongs.
2. may be s, p, d, or f.
3. gives information about the maximum number of electrons the subshell may hold.
4. more than one of the above answers are correct.
5. none of the above answers are correct.

2007-12-03 09:01:42 · 1 answers · asked by Anonymous in Chemistry

Dmitri needs 7 liters of a 29% solution of sulfuric acid for a research project in molecular biology. He has two supplies of sulfuric acid solution: one is an unlimited supply of the 35% solution and the other an unlimited supply of the 14% solution. How many liters of each solution should Dmitri use?

a. 35% solution: 2 liters; 14% solution: 15 liters
b. 35% solution: 5.5 liters; 14% solution: 1.5 liters
c. 35% solution: 4.5 liters; 14% solution: 2.5 liters
d. 35% solution: 5 liters; 14% solution: 2 liters

2007-12-03 09:00:52 · 3 answers · asked by . 1 in Mathematics

Thank you for your help

2007-12-03 09:00:31 · 3 answers · asked by nygirl 1 in Medicine

x^2 + y^2 = 4

ok , so here is my work. well, sort of. I did it in my head since it's a easy one. LOL.
dy^2/dx = -2x

so from here, do we take a square root for both sides?

2007-12-03 08:58:16 · 3 answers · asked by Anonymous in Mathematics

{-7y = x + 44
{2x + 6y = -32

a. (5, -7)
b. (-5, -6)
c. (4, -6)
d. no solution

2007-12-03 08:57:15 · 2 answers · asked by . 1 in Mathematics

1) What is a common method of locomotion used for both land and aquatic animals? Name one aquatic and oone terrestrial animal that uses it. [[I was thinking swimming]]
2) Three methods of obtaining oxygen [[I already have 2, gills & lungs, would skin be one? In animals such as certain frogs and other amphibians]]

Thanks for your imput!

2007-12-03 08:57:09 · 1 answers · asked by Loose Like Wizard's Sleeve 3 in Zoology

Ok people I have this two problems that I have an idea of how to workout but the answers I get differ from what the book says, so I need someone's help, please!!!

A 55 g ice cube at 0°C is heated until 45 g has become water at 100°C and 5 g has become steam at 100°C. How much energy was added to accomplish the transformation?

How much energy is required to heat 40g ice at -10°C to steam at 110 °C?

2007-12-03 08:56:29 · 3 answers · asked by kryptobud2003 2 in Physics

I'm looking for a way to get down a mountain a little bigger than the grand canyon. It takes about six hours by foot using trails that barely exist and maybe two feet wide.

An about how much would you think it would cost. I thought maybe several rope ladders but might not be best because of length issues.

Food and backpacks would also be carried down.

Here is a picture of what im talking about. COPPER CANYON

http://farm2.static.flickr.com/1344/540618667_5178e9b377.jpg?v=0

What do you think would be best.

2007-12-03 08:54:30 · 4 answers · asked by Anonymous in Earth Sciences & Geology

Given a slab of material that is 1.2 m^2 and 2.4 × 10^-2 m thick
(a) what is the thermal resistance if the material is asbestos? (b) What is the thermal resistance if the material is iron?
(c) What is the thermal resistance if the material is copper?

2007-12-03 08:49:58 · 1 answers · asked by Jerry M 1 in Physics

A birch tree loses 667 mg of water per minute through transpiration (evaporation of water through stomatal pores). What is the rate of heat lost through transpiration?

2007-12-03 08:48:26 · 1 answers · asked by Bob P 1 in Physics

Ice at 0.0°C is mixed with 6 × 10^2 mL of water at 23°C. How much ice must melt to lower the water temperature to 0.0°C?

2007-12-03 08:47:50 · 1 answers · asked by Bob P 1 in Physics

2007-12-03 08:47:16 · 0 answers · asked by jumpshotcap 1 in Medicine

2007-12-03 08:45:10 · 5 answers · asked by Anonymous in Mathematics

How many valence electrons does Molybdenum (element #42) have?

2007-12-03 08:42:33 · 4 answers · asked by ThunderGoalie30 1 in Chemistry

2007-12-03 08:41:53 · 2 answers · asked by Veronica 1 in Zoology

2007-12-03 08:41:15 · 3 answers · asked by Anonymous in Mathematics

2007-12-03 08:40:58 · 9 answers · asked by ilovesoccer 1 in Mathematics

1)
x = 7
2x + 6y = 44
-x + 7y - 2z = 22

2)
x = 3
5x + 4y = -9
-x + 4y - 2z = -25

2007-12-03 08:40:10 · 1 answers · asked by wrongnumber 1 in Mathematics

The third term of an arithmetic sequence is 58 and the sixth term is 139. 2 marks.
a) What is the common difference?

b) What is the first term?

2007-12-03 08:38:40 · 2 answers · asked by John Cikkaaaaa 1 in Mathematics

2007-12-03 08:37:43 · 5 answers · asked by Veronica 1 in Zoology

2007-12-03 08:35:36 · 3 answers · asked by Veronica 1 in Zoology

wat are some supplies i would need 2 bring on a camping trip in the forest

2007-12-03 08:34:29 · 2 answers · asked by B Dub 3 in Botany

how long will it take them to travel 4.2 light years- the distance to the nearest star?

Please show me your calculations...

2007-12-03 08:31:53 · 5 answers · asked by Anonymous in Astronomy & Space

A solid cylinder (radius = 0.150 m, height = 0.120 m) has a mass of 6.50 kg. This cylinder is floating in water. Then oil ( = 725 kg/m3) is poured on top of the water until the situation shown in the drawing results. How much of the height of the cylinder is in the oil?

2007-12-03 08:28:41 · 1 answers · asked by Anonymous in Physics

What is my final grade for my class if this is how he grades?
1) Introductory Assignment: 2% of total grade.
2) Four exams: 20% each, or 80% of total grade.
3) Writing Project 18% of total grade

Here are the grades....
Writing Project (Out of 100.00) 100.00
Introductory Assignment (Out of 100.00) 100.00
Exam 1 (Out of 99.90) 85.10
Exam 2 (Out of 100.00) 80.00
Exam 3 (Out of 99.84) 94.36
Exam 4 (Out of 100.00) 64.00

2007-12-03 08:27:20 · 4 answers · asked by curt 1 in Mathematics

The height of a certain waterfall is 33.3 m. When the water reaches the bottom of the falls, its speed is 25.8 m/s. Neglecting air resistance, what is the speed of the water at the top of the falls?

2007-12-03 08:26:51 · 1 answers · asked by Anonymous in Physics

0 x (any numerical value) = 0
undefined x (any numerical value) = undefined
0 x undefined = ?????

2007-12-03 08:25:43 · 8 answers · asked by Heero 2 in Mathematics

I have a question that asks to find the length and width of an object with an area of 108 sq feet and a diagonal mesurement of 15 feet. I know it needs to be solved as a system. This is what I have
xy=108
x^2+y^2=15 (should it be ^2 also?? or is it already?) help!!
So sub one equation into the other, which, how ect. Thanks

2007-12-03 08:24:03 · 2 answers · asked by Happy Killa Pants 2 in Mathematics

2007-12-03 08:22:02 · 4 answers · asked by NICH178 2 in Astronomy & Space