Science & Mathematics - 20 November 2006

filled w/ helium plus air at atmospheric pressure is designed to support a mass of 117 kg (payload + empty balloon). Ignoring the volume of the payload, find the volume of the baloon in units of m^3.

Other data given: Air density is 1.29 kg/m^3, helium plus air density in the balloon is 0.466 kg/m^3, and helium density is 0.179 kg/m^3.

2006-11-20 04:41:40 · 1 answers · asked by Dee 4 in Physics

2006-11-20 04:41:24 · 2 answers · asked by salim k 1 in Weather

2006-11-20 04:39:19 · 9 answers · asked by Anonymous in Engineering

2006-11-20 04:38:53 · 11 answers · asked by Billy 1 in Botany

The highest possible oxidation state for the halogens is +7 and the lowest is -1.

2006-11-20 04:36:16 · 1 answers · asked by bebop_0632 1 in Chemistry

2006-11-20 04:36:04 · 6 answers · asked by Nad10 2 in Mathematics

2006-11-20 04:34:47 · 1 answers · asked by haimanjus 1 in Medicine

Na3n plaese tell me tha names of those compounds

2006-11-20 04:34:27 · 6 answers · asked by carboy_carlover 1 in Chemistry

Hi,

Not quite sure how to do this question:

(i) In 2000, the mass of CO2 emitted in the UK was equivalent to 1kg per person in every hour.

Calculate the volume of 1kg of CO2. Assume that 1 mole of CO2 occupies 24dm3.

Thanks,

Rock

2006-11-20 04:32:50 · 3 answers · asked by Anonymous in Chemistry

2006-11-20 04:32:29 · 4 answers · asked by Anonymous in Geography

If I could arrange a water turbine so that it would pump 10% of the water driving it back upstream,now the stream has increased by 10% so my turbine can now pump harder and can pump 10% more water back upstream. You see where I'm going? I know you cannot lift yourself up by your bootlaces. So what happens to my turbine?

2006-11-20 04:32:26 · 3 answers · asked by bo nidle 4 in Physics

2006-11-20 04:27:53 · 8 answers · asked by Anonymous in Chemistry

Is the wheel well compartment they are held in pressurized? Are they inflated pryor to landing?

2006-11-20 04:26:36 · 6 answers · asked by Anonymous in Engineering

2006-11-20 04:26:30 · 8 answers · asked by pggy_huff 1 in Zoology

Carbon dioxide can be prepared easily in the laboratory by the action of heat on most carbonates. Construct an equation to illustrate this reaction.

Thanks

2006-11-20 04:25:51 · 2 answers · asked by Anonymous in Chemistry

2006-11-20 04:24:34 · 5 answers · asked by baddy 1 in Mathematics

Every one understands the purpose behind the nipples of a woman - to feed the child., But what is the use and purpsoe of a similar ones in men? Is there any scientific reason or use of them?

2006-11-20 04:24:33 · 16 answers · asked by ashok l 1 in Biology

Lets say we could attach one end of a piezoelectric substance to a musical tuning fork and the other to a fixed point, then we made the fork vibrate, it would make a voltage come out the piezo substance as a force is being applied.
How much energy could be harvested from this (in Watts)? Lets all assume that the fork is vibrating at 440Hz (the first A above middle C in the musical scale).

2006-11-20 04:20:49 · 6 answers · asked by MacKniven 3 in Physics

Is it evaporation?

2006-11-20 04:20:38 · 17 answers · asked by pants1610 1 in Chemistry

I've been hearing a lot of people saying things like, "I'm a Leo with a astrological decendent of a Virgo." I'm not really into astrology, but I think it's interesting, and I have no clue what they are talking about. Do any of you? Also...if you do, do I have one? I'm a Libra born 10/12.

Thanks!

2006-11-20 04:17:41 · 5 answers · asked by Chanel 3 in Astronomy & Space

2006-11-20 04:16:22 · 3 answers · asked by Anonymous in Biology

I would like to know the populations of some cities 50 years ago (in 1956) and I'm having a hard time winnowing out this information. Can anyone help point me where to look? The cities I would like this information on are:

New York
London
Paris
Chicago
Los Angeles
Montreal
Toronto
Hamilton, Ontario (Canada)

Many thanks,
Elise

2006-11-20 04:16:21 · 1 answers · asked by Elise K 6 in Geography

!) Find all primes p such that 4p^2+1 and 6p^2+1 are both primes?
2) Find all real x>0 such that x-[x], [x],x (where [x] denotes the greatest integer not greater than x) form a geometic progression./

2006-11-20 04:16:16 · 2 answers · asked by r 2 in Mathematics

what does y equal??

2006-11-20 04:15:46 · 10 answers · asked by katie. 1 in Mathematics

and makes an effort to keep away from the region of the Geiger counter. What is your advice to the 2nd friend?

2006-11-20 04:15:39 · 7 answers · asked by wildbutterflychick 2 in Chemistry

I got stuck on this the question is....

use row operations to solve the system.
x - y = 4
y - z = -3
x + z = 5

i got all the way to getting
x-y=4, y-z=-3 and z=2 an
d they said the final answer is {(3, -1, 2)}
how did they get from 4,3,2 to 3,-1,2?

2006-11-20 04:14:18 · 6 answers · asked by incubabe 6 in Mathematics

2006-11-20 04:13:17 · 4 answers · asked by shaz 1 in Biology

2006-11-20 04:12:54 · 36 answers · asked by al 2 in Astronomy & Space

2006-11-20 04:12:05 · 10 answers · asked by ME 3 in Mathematics

2006-11-20 04:11:27 · 2 answers · asked by Anonymous in Engineering