Science & Mathematics - 31 August 2007

If a, b, c are three positive numbers such that a + b + c = 1, prove that ab + bc + ac ≤ 1/3

[HINT: Use a² + b² ≥ 2ab etc, & use square of trinomial]

2007-08-31 16:29:44 · 2 answers · asked by Akilesh - Internet Undertaker 7 in Mathematics

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if you see a really bright flash in the sky and after a red streak what would it be?

2007-08-31 16:29:20 · 7 answers · asked by Jason 2 in Astronomy & Space

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How do most unicellular algae get food?

How does this differ from the way most animal-like protists get food?

2007-08-31 16:28:47 · 5 answers · asked by blue october 3 in Biology

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Please help! Meteorite shower tonight?

I read that there is suppose to be a meteorite shower [or something similar] tonight [August 31] or early tomorrow morning [September 1]. This particular shower only happens every 2,000 years or so. Please tell me more about it, do you have links for information? Also when is a good time to look for it in the sky in central California? I really want to see it [since I probably won't be around on two thousand years]. Please answer soon and thanks.

2007-08-31 16:26:51 · 4 answers · asked by Bet 6 in Astronomy & Space

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What is the most needed, fundamental law of physics?

for instance, with Coulomb's Law, the fact that opposite charges attract enables chemical bonds to be built, enabling production of amino acids, and letting life live on earth.

2007-08-31 16:20:21 · 14 answers · asked by isuckatphysics 2 in Physics

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What is the scientific reason as to why yawns are contageous?

My friend and I are talking about yawning. We know that they are caused due to lack of oxygen to the brain, but we were wondering exactly why they are SO contageous! Does anyone know why we yawn when we so much as hear another person yawn? The more details the better. Thanks!

2007-08-31 16:16:01 · 5 answers · asked by Caitlin 2 in Medicine

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help with dividing integers?!?

-8 over 9 divded by 2 over 3. they are fractions but i dotn know how to solve the problem.

another problem i need help with:

0 times 4.75. (not fraction)

0 divded by 10. (thsi is not fraction)

-1 over 3 divded by (-6). they are also fractions

hope it isnt confusing

2007-08-31 16:14:53 · 6 answers · asked by Anonymous in Mathematics

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what do Clinical Laboratory Technologists and Technicians do?

2007-08-31 16:14:11 · 4 answers · asked by Pretty Lady 1 in Medicine

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Einstein solved this when he was 12...?

My answer was ~1000...but im not sure about the reasoning.
Could you please help me with this problem?

"A hard rubber ball, realeased at chest height, falls to the pavement and bounces back to nearly the same height. When it is in contact with the pavement, the lower side of the ball is temporarily flattned. Suppose the maximum depth of the dent is on the order of 1cm. Compute an order of magnitude estimate for the maximum acceleration of the ball while it is in contact with the pavement"

2007-08-31 16:08:22 · 3 answers · asked by Anonymous in Physics

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Is it true that women are biologically superior to men?

If so, it must be caused by the strain after a (good) f**k. We men are tired and very hungry afterwards. Do women get away with our male energy in fact? I tell myself: what the heck, let it be; after all they also have to carry new life for the survival of the human race.

2007-08-31 16:08:14 · 15 answers · asked by Robin frisky 2 in Biology

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Michael break a wall by hook's law in prison break?

May I know how is the drill holes placement ,
in circular ?
Any simple drawing for my reference?
Someone do this test in china and it works.

2007-08-31 16:06:22 · 3 answers · asked by colorfulbooks 2 in Engineering

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what happens when your cell phone is submerged in water?

2007-08-31 16:05:30 · 5 answers · asked by mtnetr 2 in Physics

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simplify 10√3x+7√3x this ?

2007-08-31 16:01:13 · 2 answers · asked by spirtworld41 1 in Mathematics

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Determine the units (ones) digit of the product of the first 10000 prime numbers.?

somebody helpppp. i can't find any pattern whatsoever/

2007-08-31 15:59:29 · 3 answers · asked by ? 2 in Mathematics

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My son has a problem with his math HW, he asked me and his mother but we dont know. Please help me to help him

Shaquille can deliver newspapers in 30 minutes. It takes Kobe 20 minutes to do the same route. How long would it take them to deliver the newspapers if they work together?

Define a variable and write an equation that represents the problem. Do not solve. (Note: Rate x Time = Work done)

Please show me some work so I can actually explain it to him, instead of giving him the answer without him understanding. I want him to understand the concept. THANK YOU SOOO MUCH. REMEMBER--BEST ANSWER GETS 10 WHOLE POINTS!!!!!!!!

2007-08-31 15:58:39 · 8 answers · asked by Anonymous in Mathematics

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what are the major type of plant tissues?

2007-08-31 15:56:42 · 4 answers · asked by michelle13 1 in Botany

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end of bourne ultimatum: would matt damon REALLY have lived?

ok, how many have seen the bourne ultimatum? at the end, matt damon jumps off a "10 story building" into the river, and swims away with no injury.

of course this is the movie, but in the spirit of having some free time on my hands (and a good mythbusters idea), would someone really swim away, or even live?

It's been awhile since I've taken physics, but here I'll try:

10 stories * 10 ft / floor = 100 feet. Let's tack 50 more feet for good measure (1st floor + shoreline?). 150 feet.

been a little bit since i've taken physics, forgive me...

We want to find velocity at the end. v^2 = v0 ^ 2 + 2 * a * (150) = 0 + 2 * 32 * 150 = sqrt(9600) = 97.98 ft / second

Time to fall. V / a = t; 97.98 / 32 ~ 3 seconds

now, do you think a final velocity of about 98 ft / second into water is enough to injure / kill a person?

2007-08-31 15:54:25 · 11 answers · asked by Chuck D 1 in Mathematics

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How Many inches is 145 Centimeters?

i was measured and i am 145 CM and i want to know how many inches that is, also how many feet (like 1 foot 1). Best answer to the first person to answer.

2007-08-31 15:51:47 · 1 answers · asked by Anonymous in Mathematics

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please help me with this physics problem!!!!!?

A record of travel along a straight path is as follows:
1. Start from rest with constant acceleration of 2.05 m/s2 for 20.0 s
2. Constant velocity for the next 2.70 min
3. Constant negative acceleration 8.77 m/s2 for 4.73 s
(a) What was the total displacement for the complete trip?
m
(b) What were the average speeds for legs 1, 2, and 3 of the trip as well as for the complete trip?
m/s
m/s
m/s
m/s

2007-08-31 15:47:55 · 1 answers · asked by ags101 2 in Mathematics

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did francis redi believe that he had disproved spontaneous generation?

2007-08-31 15:47:49 · 1 answers · asked by awesome 2 in Chemistry