Science & Mathematics - 4 October 2006

2006-10-04 11:44:40 · 3 answers · asked by Anonymous in Mathematics

What is the time lapse between seeing lightening strike and hearing thunder if the flash is 4km away?

2006-10-04 11:44:38 · 3 answers · asked by bluedevilbabygirl 1 in Other - Science

2006-10-04 11:44:35 · 2 answers · asked by bjsjr1960 1 in Chemistry

I was thinking, what a wonderful night it was,
The complexity of it all,
The distances involved,
The amount of energy it took to create such a place,
The shear awe inspiring, number of Galaxies there where,
And, where the bloody hell my roof had gone.

2006-10-04 11:44:24 · 22 answers · asked by GB123 2 in Astronomy & Space

1) 5.34g of a salt of formula M2SO4 (Where M is a metal) were dissolved in water. The sulphate ion was precipitated by adding excess barium chloride solution when 4.66g of barium sulphate (BaSO4) were obtained .

(a)How many moles of sulphate ion were precipitaed as barium sulphate?

(b)How many moles of M2SO4 were in the solution?

(c)What is the formula mass of M2SO4?

(d)What is the relative atomic mass of M?

(e)Use a table of relative atomic masses to identify M.

(2)(a)Explain what is meant by "hydrogen peroxide has the molecular formula H2O2'

(b)2H2O2------>2H2O2 + O2
What mass of oxygen can be formed from 17g of H2O?

(c)What mass of oxygen can be formed from 17g of H2O2 if 1 g of maganese dioxide catalyst is used?

(3)What mass of solid is precipitated when excess dilute sulphuric acid is added to 100cm^3 of 2 M barium chloride solution?

Explain plz.

2006-10-04 11:42:18 · 6 answers · asked by candyisland2002 2 in Chemistry

Chromium (atomic mass= 51.9961 amu) had 4 isotopes. their masses are 49.94605 AMU, 51.94501 amu, 52.94065 amu, and 53.93888 amu. the first two isotopes have a total abundance of 87.87% and the last isotope has an abundance of 2.365% what is the abundance of the third isotope? Estimate the abundances of the first two isotopes. - whats the answer and how do u get it.

2006-10-04 11:42:15 · 1 answers · asked by xoMadisonxo 2 in Chemistry

I've just bought a new calculator but can't work out how to use the minus button to convert x into -x. I hope someone can help as I've lost the manual already!

2006-10-04 11:40:42 · 1 answers · asked by statstastic 2 in Mathematics

PLEASE HELP ME!!!!!!!

2006-10-04 11:40:29 · 4 answers · asked by Reesie 1 in Mathematics

Can somebody explain to me the relationship between tire pressure and friction? Specifically, I had a conversation with my professor today regarding an off-road vehicle deflating his tires a bit to lower the tire pressure and give him better grip when rock-climbing. My professor contended that the lower tire pressure did not increase the friction between the tires and the rocks. This makes little pratical sense to me since one would 'just know' that the lower tire pressure would indeed help in the rock climbing.

Please help!!

Thanks!

2006-10-04 11:39:11 · 9 answers · asked by Bumper 1 in Physics

Boxing Match. A boxing ring is in the shape of a square 20ft on each side. How far apart are they in opposite corners of the ring?

2006-10-04 11:38:20 · 4 answers · asked by Anonymous in Mathematics

2006-10-04 11:36:33 · 21 answers · asked by straussjacques 1 in Biology

Can you assist in finding real or imaginary solutions with an explanation?

2006-10-04 11:36:25 · 8 answers · asked by Anonymous in Mathematics

SVJGQIF= HWMWGOK
IVFQUXC = WMFRXXH

Driving me crazy please tell me the formula?

2006-10-04 11:33:37 · 2 answers · asked by eddie9551 5 in Mathematics

i know this sounds really wierd, but has anyone ever seen a spaceship or alien, or anything alien related? if so, what was it like.

2006-10-04 11:31:00 · 5 answers · asked by Anonymous in Other - Science

please tell me even if it isn't a perfect square root. Thanx!

2006-10-04 11:30:33 · 11 answers · asked by Hopeicouldhelp 4 in Mathematics

Suggest one or two simple experiments to determine whether a solid white substance is a protein or a carbohydrate. what evidence would you need to support each hypothesis?

2006-10-04 11:29:35 · 3 answers · asked by Anonymous in Biology

2006-10-04 11:28:01 · 5 answers · asked by matt e 1 in Mathematics

the number Phi(2cos36)
what is this number really.how did people find this?

2006-10-04 11:27:27 · 4 answers · asked by Nethushanka 1 in Mathematics

why do leaves change colour?

2006-10-04 11:24:28 · 12 answers · asked by Anonymous in Botany

2006-10-04 11:22:08 · 11 answers · asked by STORMY K 3 in Physics

2006-10-04 11:20:35 · 1 answers · asked by aechter1 1 in Biology

2006-10-04 11:20:30 · 1 answers · asked by mysteryhack 3 in Biology

2006-10-04 11:20:29 · 5 answers · asked by STORMY K 3 in Mathematics

Their missuse of land and enviroment as well as methene release from their animals spawn these storms, not my jeep!

2006-10-04 11:18:41 · 6 answers · asked by mrmojo32073 2 in Weather

2006-10-04 11:18:32 · 4 answers · asked by steviedb9 1 in Chemistry

2006-10-04 11:17:43 · 10 answers · asked by STORMY K 3 in Mathematics

If yes, then please...explain.

2006-10-04 11:17:19 · 17 answers · asked by Richard H 2 in Medicine

(a) 2 MnO4-(aq) + 10 Cl-(aq) + 16H +(aq) 5 Cl2(g) + 2 Mn2+(aq) + 8 H2O(l)

Oxidizing agent:
Reducing agent:

(b) 8 H+(aq) + Cr2O72-(aq) + 3SO32-(aq) 2 Cr3+(aq) + 3 SO42-(aq) + 4 H2O(l)

Oxidizing agent:
Reducing agent:


6HCl(aq) + 2HNO3(aq) + 3Cu(s) 2NO(g) + 3CuCl2(aq) + 4H2O(l)

Oxidizing agent:
Reducing agent:

2006-10-04 11:16:25 · 2 answers · asked by Amy 1 in Chemistry

the conditional probability that all four flips will be heads. Then calculate the conditional probability of flipping four heads, given that the first two flips were heads. Now assign a random variable x, where the value of x is equal to the number of heads observed in the flips. Describe the probability distribution of x, and calculate the probability of observing three heads in four coin flips. (I don't even know where to start on this so if any statistics buffs could help me out I would really appreciate it)

2006-10-04 11:14:56 · 6 answers · asked by Anonymous in Mathematics

I know pretty much what they are, but I'm confused on the order. In an animal pyramid, it goes like this:

Tetiary Consumers

Secondary Consumers

Primary Consumers

Producers

---------------------

I just want to make sure I'm right that the first order consumers are the primary consumers, and the second order consumers are the secondary consumers? Or is it backwards, or some other order?

Please help! Thank you...

2006-10-04 11:14:35 · 3 answers · asked by Brad 2 in Earth Sciences & Geology