Science & Mathematics - 30 September 2006

2006-09-30 06:23:08 · 5 answers · asked by meg1956 1 in Biology

2006-09-30 06:21:18 · 16 answers · asked by Chacko_J_Chembukkavu 1 in Physics

How did people find or decide a doctor's reputation during the Roman days ?

2006-09-30 06:17:49 · 4 answers · asked by mmmporg 2 in Medicine

My question is - how can I make it the fastest possible with all I've got. Would gears or a pulley system be better? Please explain.

2006-09-30 06:17:07 · 8 answers · asked by Numptyhead 2 in Engineering

2006-09-30 06:15:52 · 15 answers · asked by Anonymous in Mathematics

There are equations where the graphed line would never pass over the 'y' axis, giving no solutions where 'y'=0.

Clearly I don't understand much about quadratic equations (or math in general), so please answer in stupid-people language.

2006-09-30 06:15:26 · 3 answers · asked by Ping 3 in Mathematics

I need to know what is the use of the purplish pigment found on the unserside of the leaves. I need sum1 to explain in scientifically n based on the topic adaptations.Thnk U

2006-09-30 06:14:27 · 5 answers · asked by ms_rar 2 in Botany

How do I know if f(x)=-7x+4 when x=-4 is greater than f(x)= -7x+4 when x= -5 or is it less than or equal to?

2006-09-30 06:10:08 · 8 answers · asked by mxyzbq 1 in Mathematics

Using Le Chatelier's Principle, explain what is happening in the test tubes

HInd + OH- <===> Ind- + H2O

Place several drops of thymolphthalein indicator into each of three test tubes.

To the first tube add about 1 mL of 0.1 M hydrochloric acid (HCl).
-No visible change

To the second tube add about 2 mL of 0.1 M ammonium hydroxide (NH4OH).
-blue solution formed, white ppt appeared on standing

To the third tube add about 1 mL of 0.1 M sodium hydroxide (NaOH).
-dark blue solution formed

Split the contents of the second tube in two by pouring about half of its contents into a new test tube. Call these tubes "2a" and "2b."


Add a few drops of 1M hydrochloric acid to tube 2a, and a few drops of 1M ammonium chloride to tube 2b. Record your observations.
2a - blue solution turned colorless, white ppt insoluble in HCl
2b - blue solution turned colorless, white ppt insoluble in HCl

2006-09-30 06:09:49 · 2 answers · asked by Noel 4 in Chemistry

2006-09-30 06:03:03 · 10 answers · asked by Anonymous in Physics

2006-09-30 05:58:27 · 6 answers · asked by Chacko_J_Chembukkavu 1 in Physics

A 7.23 kg block is on top of a table (frictionless, horizontal surface). The first block is connected by a cord passing over a pulley to another block of mass 4.09 kg which hangs in the air over the right side of the table. The cord is weightless & massless and does not stretch. The pulley has no friction or rotational inertia. The acceleration of gravity is 9.8 m/s^2.

Calculate the acceleration of the first block (in m/s^2). I got .361307 and then recalculated and got -2.71837 m/s & doubt either is correct (sigh loudly).

Calculate the tension in the cord (answer in N).

Can't figure out what I am doing wrong....if I am sure I understand and have the right answers it will help me move on to other problems. Thanks in advance for any help.

2006-09-30 05:57:57 · 3 answers · asked by Dee 4 in Physics

Hi,
i did this experiment and when i calculated the formula or missing compund it doesnt seem right.
can you please help; i have listed the experiment, the given & found values, and what to find below.

Thank you in advance.
------------------------------------------------------------------
Experiment:

In this experiment you will determine the equation of a redox reaction by the use of experimental data.

This is a reaction in which it is not obvious what products will be formed but by finding the relative number of moles reacting
you can deduce what reaction has occured.

The reaction is between bromate ions, BrO3(-) and hydroxylammonium ions NH3OH(+) in aqueous acid solution.
You assume that the bromate are converted to bromide ions, Br(-) (How can this reaction be shoed experimentally)

So the reaction that is being studied is:

BrO3(-) + NH3OH(+) ----> Br(-) + ?

2006-09-30 05:53:08 · 2 answers · asked by Anonymous in Chemistry

2006-09-30 05:46:44 · 3 answers · asked by kavitha g 1 in Chemistry

When someone buys a star (in space) as a gift to someone, where or whom gets the money? And how do you know if you completely own it, if it wasn't anyones to sell in the first place?? Plus how would you know if someone hasn't bought the same ball of gas?

2006-09-30 05:39:12 · 5 answers · asked by xkitenx1982 2 in Astronomy & Space

for the last slide of my presentation

2006-09-30 05:36:33 · 21 answers · asked by hazu121 1 in Biology

I know the Tasmanian tiger is extinct. However, some people believe it is still lurking somewhere on the island.

I have just come into Tassie for business. I also like to go hiking in the wilderness. There is also a lot of wilderness in Tassie. If I should see a tiger, what should I do? Should I try to catch it. Is it dangerous? Please bear in mind the tiger is not like the normal tiger. It is only named as such. Do you think I can set traps for it? Just asking.

2006-09-30 05:30:05 · 6 answers · asked by Forward 6 in Zoology

Or was it Bohr's idea?

2006-09-30 05:25:23 · 11 answers · asked by shreyas 1 in Chemistry

2006-09-30 05:24:17 · 1 answers · asked by bala m 1 in Engineering

2006-09-30 05:17:13 · 19 answers · asked by Anonymous in Chemistry

I know that tertiary structure is spontaneous but I dont know about secondary structure.

2006-09-30 05:16:47 · 3 answers · asked by Anonymous in Biology

2006-09-30 05:15:37 · 6 answers · asked by hilliardhillbilly 1 in Biology

2006-09-30 05:13:27 · 17 answers · asked by Chippie 2 in Geography

G = t x C^3 / M
G=gravity constant
t=time
M=mass
C=speed of light

2006-09-30 05:10:25 · 2 answers · asked by goring 6 in Physics

2006-09-30 05:00:44 · 4 answers · asked by krishna t 1 in Other - Science

2006-09-30 04:57:48 · 7 answers · asked by goring 6 in Physics

Has anyone had the experience of just randomly looking at a clock and seeing this? I'm not a clock watcher so this seems incredibly weird.

2006-09-30 04:53:37 · 16 answers · asked by atomictulip 5 in Other - Science

More then All land Super continent

2006-09-30 04:53:13 · 9 answers · asked by Anonymous in Earth Sciences & Geology

2006-09-30 04:53:08 · 12 answers · asked by Jon G 1 in Botany

2006-09-30 04:52:18 · 6 answers · asked by Anonymous in Physics