Science & Mathematics - 25 September 2006

I did a lab with potatoes, soaking them in salt solutions of 2g/100ml of water, 4g/100ml, and 6g/100ml. After that i added 5 drops of hyrdrogen peroxide to each potato and timed how long it bubbled for. The salt solution with 6 grams bubbled the longest. What does this data mean?

2006-09-25 13:35:44 · 2 answers · asked by Poj23 2 in Biology

Can anyone solve this problem for me please?

(-2b - 9)/(b2 + 7b + 12) = b/(b + 3) + 2/(b + 4)

2006-09-25 13:35:26 · 3 answers · asked by reid296 2 in Mathematics

In the show Jimmy Neutron:Boy Genius, in one of the episodes Jimmy has created an infinite storage cube that anything can be put into it and it will never run out of space.

Is such a device possible?Or is it like the easter bunny,santa clause and the boogie man;they'll never be real?

2006-09-25 13:32:33 · 7 answers · asked by Maurice H 6 in Astronomy & Space

2006-09-25 13:32:29 · 4 answers · asked by nolan 1 in Biology

I beleive it exsits and out of all people at my shcool, my Science teacher should. Do You?

2006-09-25 13:32:03 · 32 answers · asked by ♥ Hello 3 in Weather

2006-09-25 13:30:30 · 10 answers · asked by Chris H 1 in Mathematics

2006-09-25 13:29:33 · 10 answers · asked by rene_trejo 1 in Weather

plz give me the # thats supposed to be where the ? mark is
a. 2/3 = ?/15


b. 3/5 = ?/15

c. ?/3 = 8/12 ?= what?

2006-09-25 13:28:26 · 9 answers · asked by Anonymous in Mathematics

ok...
-392 is less than or greater than -389???
first one to get it wright get's ten points!!!!!!!!
lol i just love myself! j/k!

2006-09-25 13:28:06 · 6 answers · asked by anime♥girl 2 in Mathematics

A passenger on a train traveling at 135 km/h walks toward the back of the train at a rate of 7 km/h. What is the passenger's rate of travel with respect to the ground?

2006-09-25 13:26:17 · 8 answers · asked by wootsublime_gurlwoot 1 in Mathematics

AND !!!!!!!!!!

How does it explain the past and predict the future of life on earth?

2006-09-25 13:24:28 · 6 answers · asked by Anonymous in Biology

2006-09-25 13:24:16 · 3 answers · asked by nolan 1 in Biology

2006-09-25 13:22:27 · 9 answers · asked by nolan 1 in Biology

I know two bodies orbiting each other are considered planet + moon if the center of gravity is inside one of the objects, which becomes the planet. However, isn't this definition rather arbitrary? Is there a logical reason for saying the center of gravity has to be inside one of the orbiting bodies, or were astronomers saying, "Look, we have to draw the line somewhere, so this is where we'll draw it"?

Also, based on this definition, how close are the Earth and the Moon to being binary planets? Considering the size of the moon relative to the Earth, while the center of gravity may still be inside the Earth, it must be pretty close to the surface.

2006-09-25 13:21:21 · 6 answers · asked by Anonymous in Astronomy & Space

An object rests on an inclined surface. If the surface is made steeper, what does the normal force on the object do?

Increase
Decrease (i think this is right, but just checking)
Stay the same
Normal Force is zero (pretty sure its not this)
cannot be determined (pretty sure its not this)

2006-09-25 13:20:35 · 3 answers · asked by stylesofbeyond40 1 in Physics

So if the question was
2/3X+Y/3=-1/3 Would that answer be -1/3
3/5Y-X/5=-6/5 Dont know this one
4/5=-1/3X-3/4 Dont know this one

2006-09-25 13:18:09 · 9 answers · asked by TheOnE 1 in Mathematics

an organic chemistry student tries to synthesize an allotrope of carbon in which 6 carbon atoms form a single ring. the molecular formula for this compound would be C6. The student was unsuccessful. Why?

2006-09-25 13:17:12 · 4 answers · asked by Anonymous in Chemistry

2006-09-25 13:16:32 · 4 answers · asked by Roscoe P Coletrain..yip yip 3 in Earth Sciences & Geology

2006-09-25 13:14:12 · 7 answers · asked by element69ca 1 in Mathematics

What would happen to the climate if Earth took in more energy than it released?

2006-09-25 13:12:03 · 14 answers · asked by Anonymous in Earth Sciences & Geology

2006-09-25 13:11:13 · 5 answers · asked by element69ca 1 in Mathematics

I am not an engineer, but I am still a bit perplexed by certain questions. Some are as follows:

If the Eiffel Tower was supposed to be a model for the modern office tower, serving as a kind of a spine, how much weight and office space could be occupied beyond the halfway point in height? You will notice that beyond the ground level the Eiffel tower only has two platforms, the top one smaller than the lower one. After that the stairs cease, and only an elevator shaft is accommodated in the structure, apart from an obsevation deck at the top.

I worked and navigated in smaller towers, and recall that most people took the milkrun elevators serving the bottom floors and few seemed to be taking the express elevators higher up.

Were all the upper floors of the WTC towers really occupied? Could the upper floors realistically have had up to 40,000 square feet of office space?

Why did the perimeter columns appear to fall in sheets if fixed at the top and bottom? Was it stable?

2006-09-25 13:05:36 · 11 answers · asked by spanner 6 in Engineering

The dibromide is completely converted to the dichloride when it is heated in a stream of chlorine according to the equation

XBr2 + Cl2 --> XCl2 + Br2

When 1.500g of XBr2 is treated, 0.890g of XCl2 results.

(a) Calculate the atomic mass of the element X.

(Br2 = 159.8 grams/mol,
Cl2 = 70.906 grams/mol)

2006-09-25 13:04:41 · 1 answers · asked by Phu N 2 in Chemistry

66.638%?
P4 + 5O2 + 6H2O ----> 4H3 PO4

2006-09-25 13:02:32 · 1 answers · asked by ballinkickz 1 in Chemistry

2006-09-25 13:02:02 · 7 answers · asked by gabrielle 1 in Weather

2006-09-25 13:00:33 · 14 answers · asked by Anonymous in Zoology

Friend says he knows someone with a radio that can't be recorded. Says it sounds like a p.a. system, only you can't pinpoint the emitters' location, it's not quite loud enough to be recorded, and they can blend the audio into surrounding noise to make people think they're crazy. They like to set the thing up to a series of speakers and watch people wander around looking for the source. Nice people huh? Is this possible? I didn't hang around long enough to find out the hard way.

2006-09-25 12:57:53 · 2 answers · asked by goddesscrowmaiden 1 in Engineering

y=-2X+3
y=-X+7
3y-2X=-12

2006-09-25 12:53:11 · 7 answers · asked by TheOnE 1 in Mathematics

Math to support answer is necessary (velocity formulas)

2006-09-25 12:52:59 · 9 answers · asked by Anonymous in Astronomy & Space

i'd b glad if any1 can help me ta

2006-09-25 12:50:40 · 4 answers · asked by Anonymous in Mathematics