Science & Mathematics - 16 October 2007

0 ⤊

What would be possible sources of error in this lab?

http://www.temple.edu/chem-help/from_titus/911_480.htm

the lab starts with copper metal
then makes a series of reactions with other stuff
and finally getting copper metal back

i got a 62.6% yield, but i duno what happened to the rest.

thnx

2007-10-16 10:17:09 · 1 answers · asked by Anonymous in Chemistry

8 ⤊

What happens to time inside of a black hole?

How about mass?

2007-10-16 10:16:22 · 8 answers · asked by red 2 in Astronomy & Space

0 ⤊

what clear liquid will not evaporate?

I put gemstones in a wine glass and filled it with water, the water evaporates, is there anything i can use that i don't have to continuously refill, or is that just something i have to deal with?

2007-10-16 10:13:47 · 9 answers · asked by mstlight 2 in Chemistry

2 ⤊

Is daylight "white light?" If not, what natural sources contain white light?

I am trying to research the color spectrum as it relates to bubbles and I keep finding references to white light, but no sources for it. I tried to research it on the Internet, but all I get is page after page of stuff about artifical light sources.

Thanks!

2007-10-16 10:12:39 · 2 answers · asked by Emily Dew 7 in Other - Science

0 ⤊

briefly tell me what was the space race?

i dont want this to be long and drawn out just to the point.
thanks = )

2007-10-16 10:11:49 · 16 answers · asked by Anonymous in Astronomy & Space

0 ⤊

Does anyone know what percentage of the world can use solar power?

I need to know ( with a reference) what percentage of the world has the ability to use solar power

I am not interested on whether or not they should be, I just need the facts.

Anyone have a reference as well ? Thanks

2007-10-16 10:10:14 · 3 answers · asked by CookFrNW 3 in Earth Sciences & Geology

0 ⤊

2(x+1)=3x - 3?

find the value of x

2007-10-16 10:08:54 · 4 answers · asked by Anonymous in Mathematics

1 ⤊

how many pounds is in 209 tons?

math question

2007-10-16 10:08:23 · 5 answers · asked by Anonymous in Mathematics

7 ⤊

Does the electro-magnetic force bend space-time?

2007-10-16 10:08:15 · 8 answers · asked by Mitchell 5 in Physics

0 ⤊

Math Question?

The owner of a house paints this attic wall. There is a small rectangular window in the wall. The triangle's base is 4.2 metres and the height of the triangle is 4.5 metres. The base of the small rectangle is 60cm and the height is 150 cm. a) What is the area to be painted? Do you first find the area of the triangle and then you find the area of the rectangle? I dont get it? And please note that the base and height of the triangle is different than the base and height of the rectangle. And please explain so I can understand.

2007-10-16 10:08:08 · 4 answers · asked by cherry9595 1 in Mathematics

1 ⤊

Help with geometry?

Find the measure of an angle that is 2/3 the measure of its complement.

2007-10-16 10:06:38 · 4 answers · asked by Anonymous in Mathematics

0 ⤊

P=2L+2w???

i need to solve for W
please help?

2007-10-16 10:05:40 · 3 answers · asked by Nouthesia 1 in Mathematics

0 ⤊

What are its density and and melting point of Osmium?

2007-10-16 10:03:22 · 2 answers · asked by Anonymous in Chemistry

0 ⤊

homework question!?

how many twelfths of a year is in one months???
anyone?

2007-10-16 10:02:58 · 5 answers · asked by Anonymous in Mathematics

0 ⤊

Density and volume help?

It looks long but I just have two questions:

mass of empty flask with stopper = 32.634 g
mass of flask with water and stopper = 59.479 g
density of the water = 0.9973 g/cm^3
mass of water = 26.845 g
volume of water = 26.918 cm^3

the flask is then emptied and an unknown substance is added
mass of flask with new liquid and stopper = 23.531 g
density of liquid = 0.46710 g/cm^3

the flask is emptied again and dried
pieces of metal were added
weight of stoppered flask and its metal contents = 152.047 g
then filled with water and mass = 165.541
mass of metal = 13.494
mass of water = 13.494

Is the mass of metal and water suppose to be the same?
Can anyone tell me the volume of the water?
What is the volume of the metal?
What is the density of the volume?

Can you show the work? Thanks.

2007-10-16 10:02:17 · 1 answers · asked by V 1 in Chemistry

0 ⤊

can anyone help?

Solve for x:

5(x − 1) = 3x + 8

Enter a fraction.

2007-10-16 10:02:05 · 4 answers · asked by Anonymous in Mathematics

0 ⤊

what are the formular,molar mass,and colour of pottassium per manganate?

2007-10-16 10:01:26 · 2 answers · asked by Anonymous in Chemistry

1 ⤊

What actually happens to a photon in a mirror?

I am wondering about rotation symetry etc

2007-10-16 10:01:12 · 10 answers · asked by Anonymous in Physics

0 ⤊

Again, complicated... look down.?

Here is more data. I need to find the EQUATION for this graph.

i'll write in in table form.

x= 0 | 6 | 18 | 24 | 30 |
y= 4 | 6 | 8 | 10 | 12 |

remember, the equation

2007-10-16 09:59:23 · 2 answers · asked by Knives 1 in Mathematics

0 ⤊

what are the colours of CoCl2and CoCl2.6H2O?

2007-10-16 09:59:20 · 1 answers · asked by Anonymous in Chemistry

0 ⤊

4a-4=2a+14?

find the value of a

2007-10-16 09:58:41 · 8 answers · asked by Anonymous in Mathematics

0 ⤊

At high pressure (deep in the earth), does water boil at a temperature higher or lower than 100 degrees C?

hint—ever been camping at high altitude? What happens to the boiling point at high temperatures?

2007-10-16 09:58:24 · 9 answers · asked by GeoWannaB 1 in Earth Sciences & Geology

0 ⤊

Physics: Work theorum related?

A jet is launched from an aircraft carrier wit the aid of its own engine and a steam-powered catapult. The thrust of its engines is 2.3 x 10^5 N. In being launched from rest it moves through a distance of 87 m and has a KE of 4.5 x 10^7 J at lift off. Waht is the work dsone on the jet by the catapult?

2007-10-16 09:58:06 · 1 answers · asked by smarin1987 2 in Engineering

13 ⤊

does my husband cheat on me?

I would like to know. Has he ever cheated on me? How many times? Did he regret it? Is he still doing it? Does he truly love me? Any information is appreciated.

2007-10-16 09:54:33 · 14 answers · asked by Anonymous in Parapsychology

2 ⤊

2x+ 7y=35?

Whats the answer to this problem?

2007-10-16 09:51:40 · 9 answers · asked by Anonymous in Mathematics

0 ⤊

Geometry Help?

A wooden board is placed so that it leans against a loading dock to provide a ramp.

The board is supported by a metal beam perpendicular to the ramp and placed on a 1 ft. tall support.

The bottom of the support is 8 feet from the point where the ramp meets the ground.

The slope of the ramp is 2/5 (this means that for every 2 feet it goes up, it goes 5 to the side).

Find the length of the beam to the nearest hundredth of a foot. Note that the 1 ft. support is vertical, but the metal beam is not.
_____

The answer I got was 2.24 feet.

I took the point where the support meats the beam and
the point where the beam meets the ramp and used the distance formula.

By using those points, I can make a right triangle with a base
of 1 and a side of 2. Using the Pythagorean theorem, 1^2 + 2^2 = c^2, the hypotenuse
of the right triangle is sqrt(5) or 2.24 feet. So, the length of the metal beam
is 2.24 ft

This is a good first try. Please work through this one again, showing me ALL your wor