Science & Mathematics - 5 November 2007

Mr. Shah decided to walk down the escalator of a tube station. He found that if he walks down 26 steps, he requires 30 seconds to reach the bottom. However, if he steps down 34 stairs he would only require 18 seconds to get to the bottom. If the time is measured from the moment the top step begins to descend to the time he steps off the last step at the bottom, find out the height of the stair way in steps?

2007-11-05 02:58:24 · 1 answers · asked by Anonymous in Mathematics

LAST QUESTION!

2007-11-05 02:57:02 · 3 answers · asked by Anonymous in Earth Sciences & Geology

i need to see how tall would be 5'2'' because i cant read them . and i need it for my gcse

2007-11-05 02:56:01 · 3 answers · asked by Anonymous in Mathematics

Please support your answer.
Thank you!!

2007-11-05 02:53:39 · 11 answers · asked by Anonymous in Astronomy & Space

I need to make the hole in a weightlifters 'weight', larger!
It's currently, 1" wide, and I need to make the hole 26mm wide
Any ideas?

2007-11-05 02:50:20 · 22 answers · asked by spang 2 in Engineering

You have equipment that operates at 61.0 percent efficiency for the reaction below.
Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)
If you need to produce 56.2 grams of iron in your equipment, how many grams of iron(III) oxide must you react with excess carbon monoxide?

I got 201g but it's not right. Any ideas. I really hate chemistry

2007-11-05 02:48:02 · 1 answers · asked by steelhead3686 3 in Chemistry

I have to find two vectors of norm 1 that are orthogonal to vectors:
(2,1,-4,0),
(-1,-1,2,2) , and
(3,2,5,4).
I am supossed to let the vectors be (x_1, x_2, x_3, x_4), and then solve a linear system. I should have a parameter in my solution, and determine that parameter using the norm 1 condition.
Could someone explain these steps in more detail please? I still don't understand what to do.

2007-11-05 02:47:35 · 2 answers · asked by Anonymous in Mathematics

2007-11-05 02:43:45 · 2 answers · asked by Anonymous in Physics

My kid has a Science Project and this was the topic that we choose.

2007-11-05 02:41:55 · 3 answers · asked by jmowgli1 2 in Chemistry

* have you ever had paranormal activity/
* have you been visited by a spirit, ghost, alien, etc.
* What do you think about the paranormal?

2007-11-05 02:38:40 · 10 answers · asked by Anonymous in Paranormal Phenomena

2007-11-05 02:34:02 · 3 answers · asked by Anonymous in Engineering

I know the answer is (-34, 50, -6, 11) , but how do you get that solution? what is the process?

2007-11-05 02:31:42 · 1 answers · asked by Anonymous in Mathematics

2007-11-05 02:30:35 · 4 answers · asked by annisa a 1 in Earth Sciences & Geology

just curious

2007-11-05 02:29:00 · 9 answers · asked by sk8ter4god 1 in Zoology

2007-11-05 02:28:42 · 5 answers · asked by Anonymous in Biology

2007-11-05 02:28:22 · 1 answers · asked by Anonymous in Engineering

i want to know if mixing a 1 to 30 ratio in a bottle then mix another 1 to 30 ratio in a seperate bottle. then mix the contents together into one bottle. Would the ratio still be 1 to 30 or would it change to a 2 to 60 ratio?

2007-11-05 02:27:23 · 4 answers · asked by Rick 1 in Mathematics

what is mean by LSB (least siginificant bit) and MSB (most significant bit)????

2007-11-05 02:26:47 · 5 answers · asked by Anonymous in Mathematics

2007-11-05 02:25:10 · 3 answers · asked by Anonymous in Zoology

2007-11-05 02:24:29 · 3 answers · asked by jon b 1 in Mathematics

please help :D

2007-11-05 02:20:36 · 4 answers · asked by Anonymous in Mathematics

An AM station broadcasts rock music at 923 on your radio dial." Units for AM frequencies are given in kilohertz (kHz). Find the wavelength of these radio waves in meters (m), nanometers (nm), and angstroms

2007-11-05 02:18:45 · 3 answers · asked by Anonymous in Chemistry

thanks

2007-11-05 02:17:11 · 2 answers · asked by ruhail774 2 in Chemistry

Give us ASAP cos we are in a lesson right now.

2007-11-05 02:17:03 · 4 answers · asked by Anonymous in Earth Sciences & Geology

2007-11-05 02:16:08 · 18 answers · asked by Anonymous in Earth Sciences & Geology

Why doesnt it circle it with its one circle like and atom, they wont colide each other because the distance is varied from each other, and what is the force that made them go circling the sun in a line ? if the argument is about the gravity pulling each other then it would even happen now, what force did make the planets line up ?

2007-11-05 02:08:30 · 4 answers · asked by Anonymous in Astronomy & Space

This is for a science project, so people who give answers will be credited for their work. Please also list the site you got this information from, should it apply.

2007-11-05 02:08:03 · 3 answers · asked by Destiny H 1 in Earth Sciences & Geology

Q) The reaction, fructose - 6-phosphate + Pi -----> fructose - 1,6-bisphosphate + H2O,
has a Keq of 0.0001 at pH 7. What is the deltaG for this reaction?

2007-11-05 02:06:56 · 1 answers · asked by great 2 in Chemistry

I don't know anything about it but we need to hire one and I heard that some people get deffensive when used the wrong terminology.

2007-11-05 02:06:53 · 4 answers · asked by Isabelle06 4 in Engineering

2007-11-05 02:06:21 · 10 answers · asked by Anonymous in Medicine