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Science & Mathematics - 25 September 2006

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Agriculture · Alternative · Astronomy & Space · Biology · Botany · Chemistry · Earth Sciences & Geology · Engineering · Geography · Mathematics · Medicine · Other - Science · Physics · Weather · Zoology

Teacher said it was absolute value x. Why?

2006-09-25 10:32:48 · 9 answers · asked by Ronald S 1 in Mathematics

2006-09-25 10:28:17 · 8 answers · asked by Anonymous in Earth Sciences & Geology

The period, T, of a pendulum is given in terms of its length, l , by

T = 2phi(l/g)^1/2

If I find the sign of dT/dl is positive then what does this tell about the period of pendulums???

Need answer right away, thanks

2006-09-25 10:25:46 · 3 answers · asked by Anonymous in Mathematics

Please take note of the following:

1.400,000 people worked on the American manned space program leading up to the moon missions – how do you fool all these technical people?
2.There were 27 manned missions from 1961 to 1972. 6 Mercury missions, 10 Gemini missions, and 11 Apollo missions.
3.Four Apollo manned missions preceded the moon landings, with 3 of them actually going to and orbiting the moon.
4.Why can’t we do it now? – quite simply, there is no Saturn V rocket. It needed the phenomenal power of this giant 360 foot rocket to get a manned probe beyond Earth’s orbit.
5.What happened to the Apollo? – read the history. Americans were wholly caught up in the Vitenam war, with massive and violent demonstrations going on. People saw the space program as a huge waste of money when there were so many social and international problems to attend to.
6.Apollos 18-20 were cancelled because of lack of taxpayer interest.

2006-09-25 10:25:20 · 7 answers · asked by nick s 6 in Astronomy & Space

My classmates and I (we are third graders) like to talk into the fan in our classroom because we sound like robots. Why does this happen?

2006-09-25 10:19:10 · 6 answers · asked by Weets 2 in Other - Science

I got stuck on this problem, maybe someone can give me a hint

Let (X, M , m) be a measure space and let (f_n: X --> [0, oo]) be a
sequence of functions that converges to a function f. Suppose that lim (\Integral(over X) f_n dm) = \Integral(over X) f dm < oo. Then, for every set E in the sigma-algebra M, we have lim (\Integral(over E) f_n dm) = \Integral(over E) f dm. Show that this conclusion may fail if \Integral(over X) f dm = oo.

If lim (\Integral(over E) f_n dm) = \Integral(over E) f dm is not true, then it's not hard to show that there's a subsequence (f_n_k) such that lim (\Integral(over E) f_n_k dm) < \Integral(over E) f dm, but I don't see why this leads to a contadiction.

Thank you

2006-09-25 10:17:10 · 2 answers · asked by Steiner 7 in Mathematics

note that 3n is 3 to the power of n.

2006-09-25 10:17:05 · 2 answers · asked by x1gemma1x 1 in Mathematics

determine empirical formula from 3.37 g silicon combined with 12.4 g chlorine

2006-09-25 10:16:23 · 3 answers · asked by vadawa13 3 in Chemistry

I have a physics question that I can't figure out. Thanks to everyone who can answer!!!

A record was set for stair climbing when a man ran up the 1600 steps of the Empire State Building in 10 minutes and 59 seconds. If the height gain of each step was .20 m, and the man's mass was 70 kg, what was his average power output during the climb? Give your answer in both watts and horsepower.

Thanks to everybody who can help me!!!

2006-09-25 10:13:54 · 6 answers · asked by serendipitousgirl 3 in Physics

We've gotten lots of great science from unmanned space probes, the Hubble telescope, etc., but manned space exploration gives very little extra science for a huge extra price tag. What's the point?

Don't tell me we're getting ready to live in space after the Earth becomes uninhabitable. First, any space colony will depend on supplies from Earth for the forseeable future. If our society collapses, the space colony is toast. Second, it's not credible that the government is planning for the distant future when space colonies can become self-sufficient, when they're not even bothering to reduce greenhouse gas emissions now!

2006-09-25 10:12:28 · 10 answers · asked by rainfingers 4 in Astronomy & Space

Imagine a bullet collides with the edge of a ball of plastcine. Is the equation above correct in handling that scenario?

2006-09-25 10:10:08 · 6 answers · asked by The Yeti 3 in Physics

2006-09-25 10:07:24 · 6 answers · asked by sarah 2 in Biology

2006-09-25 10:07:01 · 10 answers · asked by rizzil 1 in Physics

How does evolution occur? Help!?

Question: How does evolution occur?

Choose the best answer:

a. Through changes in gene frequencies
b. through mutated RNA
c. Through protein mutations
d. Through the mutations that happen during natural selection.

2006-09-25 10:05:53 · 17 answers · asked by thunderbomb90 3 in Biology

2006-09-25 10:05:17 · 6 answers · asked by amj4_ever 1 in Biology

2006-09-25 10:04:24 · 3 answers · asked by mafernanda padilla 1 in Biology

velocity, or acceleration

2006-09-25 10:02:54 · 7 answers · asked by Stella P 1 in Physics

rank the following compounds from (1) lowest to (4) highest boiling points.

butane
2,3-dimethylbutane
hexane
2-methylpentane

thanks so much.

2006-09-25 10:02:42 · 5 answers · asked by keanweaner 4 in Chemistry

2006-09-25 10:01:02 · 31 answers · asked by LINDA T 1 in Zoology

f(x)= something + 2(pie)(r-squared) I believe...don't know how to get the surface area of the round part of the cylinder, only top and bottom.

2006-09-25 10:00:39 · 3 answers · asked by big_j_gizzy 4 in Mathematics

an ice cube in water.. dont ask.. its an assignment for science :
i have this so far:

The ice cube is smooth
The circumference of the cup is
The water is cold
The ice is melting
The water is clear
The ice cube is not clear
The length of ice cube
Weight __
The ice cube is slippery
The ice cube floats
When looking from the side of the cup, the cub is blurry because of the cold.
How much the water is filled up





.... i need at least 90 lol anyy help greatly apprecaited...

2006-09-25 09:59:07 · 6 answers · asked by this isnt my name. 1 in Other - Science

And how do you know what temperature changes the properties of specific chemicals?

2006-09-25 09:56:06 · 6 answers · asked by Anonymous in Chemistry

I forget where I saw this theory, can anyone refresh my memory?

2006-09-25 09:55:56 · 8 answers · asked by frostbitten 3 in Astronomy & Space

Suppose you are driving on route 80 to attend a broadway show in NY at 7pm. The average speed on route 80 is 50mph. U have to drive 40 miles to get to the George Washington Bridge. It will take about 18minutes to pay the toll and to cross the bridge, it will take about 30 more minutes of driving to get to the theater, and it will take about 25 minutes to park the car and get in your seat inside the theater. if the show begins exactly at 7pm and u want to be no more than 20 minutes early, what is the earliest time you should leave your home for the show? exlpain your answer

2006-09-25 09:52:51 · 3 answers · asked by D M 1 in Mathematics

2006-09-25 09:52:34 · 8 answers · asked by helen r 1 in Mathematics

I'm doing a lab report on an analysis of alum, and one of my discussion questions is the one listed above. Will the mass change if the object is not cooled?

2006-09-25 09:50:37 · 6 answers · asked by Nikki 1 in Chemistry

If you had a battery rated as 100 mAmp-hr, and it was in a circuit that had a current of 50 mAmps, how long would you expect the battery to last?

i think 2hrs

2006-09-25 09:49:16 · 3 answers · asked by Diggler AKA The Cab Driver 1 in Physics

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