Science & Mathematics - 29 August 2006

When do you think manned spacecraft will achieve orbit in single stage?

2006-08-29 10:24:20 · 5 answers · asked by inexsilium 2 in Engineering

a) radio waves sound better
b) in a vacuum radio waves travel slower than light waves
c) radio waves cannot be reflected
d) radio waves have a longer wavelength than light.

2006-08-29 10:22:30 · 7 answers · asked by dodido 3 in Physics

2006-08-29 10:21:54 · 10 answers · asked by Ash 1 in Other - Science

2006-08-29 10:21:41 · 9 answers · asked by Anonymous in Astronomy & Space

a) Only momentum is conserved
b) Only energy is conserved
c) Both energy and momentum is conserved
d) Neither energy and momentum is conserved

2006-08-29 10:21:32 · 4 answers · asked by dodido 3 in Physics

a) 1000 kg
b) 4000 kg
c) 7000 kg
d) 10000 kg

2006-08-29 10:20:52 · 5 answers · asked by dodido 3 in Mathematics

If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?
please show work so i can understand how to do this problem. thanks.

2006-08-29 10:20:32 · 10 answers · asked by Mr. 1 in Mathematics

2006-08-29 10:19:14 · 6 answers · asked by BenignSource 4 in Biology

If nobody does, then I claim them as my planets this moment.

2006-08-29 10:19:07 · 14 answers · asked by Anonymous in Astronomy & Space

a) Double-slit diffraction pattern
b) Compton Effect
c) Refraction
d) Total internal reflection

2006-08-29 10:16:42 · 6 answers · asked by dodido 3 in Chemistry

how much bigger? A little or a lot?

2006-08-29 10:16:28 · 9 answers · asked by john 2 in Physics

tan^-1(x)

The choices are:
a) 1 / sqrt(1 - x^2)
b) 1 / sqrt(x^2 - 1)
c) 1 / (1 + x^2)
d) 1 / (1 - x^2)

2006-08-29 10:15:36 · 2 answers · asked by dodido 3 in Mathematics

2006-08-29 10:15:28 · 9 answers · asked by fennec 1 in Geography

Is it possible to burp, fart and sneeze simultaneously?

2006-08-29 10:14:48 · 12 answers · asked by Bubba 2 in Zoology

2006-08-29 10:13:23 · 8 answers · asked by Mr. 1 in Mathematics

2006-08-29 10:12:07 · 10 answers · asked by vtfirecat 1 in Zoology

I've noticed over the past year an increasing number of these odd poles. They are like lamp posts, but with no light at the top. There is a more bulbous part at the top about 2-3m long maybe. Also there is always some sort of metal box at the base (? containing some electric/electronic equipment). My first guess was these were 3G phone masts, but I've seen several quite close together along a street e.g. 100-200 metres apart, so it seems too close for mobile phone masts. It must be some sort of communication device. Can anyone help?

2006-08-29 10:10:35 · 21 answers · asked by Chookster 1 in Engineering

2006-08-29 10:09:59 · 12 answers · asked by Anonymous in Chemistry

2006-08-29 10:07:05 · 15 answers · asked by BlueAngel 2 in Geography

Hey, i just need a bit of help with a few things that i should know but just forgot how to do, lol. I'm pretty sure you can simplify at least a few of these down, hopefully someone out there remembers it better than i do, Thanks!

(x+3) + ((2x)/(x-5))

(x+3) - ((2x)/(x-5))

(x+3) * ((2x)/(x-5))

(x+3) / ((2x)/(x-5))

and yes i know there's extra () i just put them in to make sure everyone would know what i mean b/c it's hard to write this nicely on here, Thanks Again.

2006-08-29 10:03:02 · 3 answers · asked by Anonymous in Mathematics

Something to do with electricity possibly. Something interesting. I'm in 8th grade and would greatly appreciate some ideas!

2006-08-29 10:02:34 · 3 answers · asked by JP 1 in Physics

The details of my modulation scheme are as follows: 4 FSK, deviation is 2 kHz and 4 Khz with a data rate of 10 kHz. Can someone tell me the tradeoffs with limiter type of demod vs other types?

2006-08-29 10:00:41 · 3 answers · asked by Anonymous in Engineering

2006-08-29 10:00:25 · 14 answers · asked by Yvette C 1 in Astronomy & Space

Could we stop a ship going the speed of light? If it where possibly to travel that fast?

2006-08-29 09:59:35 · 14 answers · asked by Rock Skull 2 in Astronomy & Space

I have bought a magnetic hematite bracelet and now I am trying to find more info about the stone. It is a bit difficult to find an answer on line. If hematite is artificially magnetized (as far as I understood) and in nature it is not magnetic or has very weak magnetic property, for how long will the magnetism last? It cannot last forever. Unfortunately I didn't ask the seller at the time. Anybody knows?

2006-08-29 09:58:37 · 3 answers · asked by Tanya N 1 in Physics

2006-08-29 09:57:13 · 25 answers · asked by BlueAngel 2 in Geography

2006-08-29 09:56:32 · 2 answers · asked by firefightingoperator 1 in Other - Science

2006-08-29 09:56:21 · 1 answers · asked by emulakandov 2 in Physics

clearly, a gas turbine can only produce as much thrust in terms of energy as is contained in the kerosine it consumes.

if, alternatively, electric energy was used: 1- if electric energy 'was' abundantly available, how would a set of electromotors generate thrust if they had no compression chambers? how would you simulate such a device for electric engines? 2- How heavy would this device + the engines need to be as a rough estimate (see sample settings at the end) ? 3- what would need to be the charge density of the battries used if, by weight, they had to remain within 200% of the weight of kerosine? Let's say this would be for a one hour trip, 2,500 gallons, and the thrust produced would be 10K pounds. please adjust numbers if they seem off to you. Thank you.

2006-08-29 09:55:36 · 7 answers · asked by blashgari@sbcglobal.net 2 in Physics

From the journey there to life sustainment, and is it most logical as of now, excluding future advancements in science and technology, but as of now do you agree it is the only realistic option?

2006-08-29 09:55:07 · 4 answers · asked by Rock Skull 2 in Astronomy & Space