Science & Mathematics - 23 September 2007

2007-09-23 02:52:23 · 2 answers · asked by Anonymous in Biology

When one lifts with all his force &gets exhausted to pick up say a 500kg weight which doesnt move at all, the output work done = (force * distance) which is zero where did the input energy go??

2007-09-23 02:49:33 · 8 answers · asked by bhushan k 1 in Physics

What is the best small portable quiestest generater to go camping with when you are around a lot of people and the you want the generater as soundless as possible.

2007-09-23 02:48:01 · 3 answers · asked by Anonymous in Engineering

Cars please!

2007-09-23 02:47:12 · 5 answers · asked by Anonymous in Engineering

When an animal dies in a zoo, what do they do with the body?

2007-09-23 02:46:41 · 14 answers · asked by Anonymous in Zoology

In Baseball, a players batting average multiplied by the number of times at bat equals the number of hits. A player had 125 at bats and 36 hits. What was this players batting average?

2007-09-23 02:45:35 · 6 answers · asked by Sophie R 1 in Mathematics

Salt is placed in water in an oven, and when it comes out, the salt is in huge chunks. Is this a physical or a chemical change?

2007-09-23 02:43:36 · 3 answers · asked by Celine 1 in Chemistry

2007-09-23 02:43:17 · 2 answers · asked by Anonymous in Chemistry

In a co-education class, 3/5 of the pupils are boys. If 1/2 of the girls are under 12 years of age and the remaing 8 girls are over 12, how many boys are there in the class? What is the total number of pupils in the class?

2007-09-23 02:42:23 · 3 answers · asked by Anonymous in Mathematics

a country has three newspapers A, B and C.
40% of the people read B
36% read A
52% read C
8% read A and B
11% read B and C
13% read A and C
3% read all the papers
and 19% read none
what percentage
read A?
and what percentage read both B and C?
what percentage read both A and B ?

I spend like1 hour on this and still can't do it...
I'm trying to help my brother.
but I can't.
can someone help?

2007-09-23 02:40:36 · 8 answers · asked by Anonymous in Mathematics

2007-09-23 02:40:29 · 4 answers · asked by Anonymous in Weather

A cistern is 3/8 filled with water. When 400 liters of water are added, the cistern becomes half full. What is the capacity of the whole cistern?

2007-09-23 02:37:56 · 4 answers · asked by Anonymous in Mathematics

1) 0.45

2007-09-23 02:35:21 · 4 answers · asked by Anonymous in Mathematics

A tourist travelled 3/8 of a certain journey by train, 3/5 of it by bus and the rest by taxi. If the total distance travelled was 320km, how far did the tourist travel by taxi?

2007-09-23 02:35:17 · 5 answers · asked by Anonymous in Mathematics

Today is the Equinox, so I figured that there would be less than 12 hours sunlight tomorrow in the northern hemisphere, but when I check the web, I find that almost every place in the northern hemisphere has slightly more than 12 hours sunlight. Why?

http://www.sunrisesunset.com/calendar.asp

2007-09-23 02:29:43 · 5 answers · asked by Hein H 1 in Astronomy & Space

If there is insufficient air flow to the flame, what color is it? Why?

2007-09-23 02:26:33 · 6 answers · asked by kenya nicole 1 in Chemistry

i have 4 question.

(small letter means sides, capital means angle)
1. Triangle PQR.
[p]=18
[Q]=46degree
[R]=39deg.

2. Triangle PQR(again)
[p]=27
[Q]=113degree
[r]=43


3. two roads intersect at an angle of 102.1 degree. Your friend's mailbox is 476 ft. from the intersection. Your mailbox is on the other road and is 615 ft from the intersection. How far is it from your mailbox to your friend's mailbox?.

4. you measure the angle of elevation to an airplane as 46.3 degree. At the same time your friend, who is 600ft closer to a point directly beneath the plane measures the angle of elevation as 47.5 degree. Find the altitude of the plane.

please help me i am a slow learner when it comes to trigo.. i need solutions. please help me!!!.. thanks.

2007-09-23 02:26:11 · 4 answers · asked by jhemO 2 in Mathematics

there are 27 members in a swimming club. 19 have brown hair. 14 have blue eyes.. 11 have both...

how many have blue eyes?


can you show me how you got the answer?

2007-09-23 02:23:36 · 8 answers · asked by Anonymous in Mathematics

2007-09-23 02:19:59 · 12 answers · asked by Anonymous in Astronomy & Space

2007-09-23 02:18:52 · 5 answers · asked by Anonymous in Mathematics

One evolutionist complained that I called the evolutionists the evolutionists. http://answers.yahoo.com/question/index?qid=20070923053253AA69uZn&r=w
As of now, he received two thumb up. (The thumb down is from me.) Is this the general opinion? Is it that evolution is not a field of study as cryptography or other specialized fields of study are?

We call those who study physics the physicists. We call those
who study mathematics, the mathematicians. We call those who study computer science, the computer scientists. We call those who study cryptography (part of mathematics), the cryptographers. So, how should we call those who study evolution?

2007-09-23 02:18:46 · 6 answers · asked by My account has been compromised 2 in Biology

My Science Homwork Asks Us To Find Out How Einstein Changed Arestolee's 3 Laws? Ive Looked Everywehere, Asked My Friends If They Have Found Anything. And Nobody Has..Can Anyone Help? Much Apprciated!

2007-09-23 02:18:32 · 5 answers · asked by rawk_is_my_passion 1 in Physics

1) The length of a rectangle is represented by L.If the width of the rectangle is one half of its length,represent its width.

2)A man bought an article for c dollarsand sold it at a profit of $25.Represent the amount for which he sold.

2007-09-23 02:17:54 · 8 answers · asked by Anonymous in Mathematics

Is Mars a dead planet? I hear people say that a lot, if so when do you think it died? And will we ever find out if there were some other type of things living there?

2007-09-23 02:14:42 · 5 answers · asked by Anonymous in Astronomy & Space

2007-09-23 02:12:29 · 3 answers · asked by WR 1 in Mathematics

a standard solution of glucose contains 100mg of glucose per ml.1/50 dilution of this standard would contain how much glucose per ml?

2007-09-23 02:08:02 · 3 answers · asked by hiv 1 in Chemistry

Paticualy the removal of silicates using calcium carbonate

2007-09-23 02:06:16 · 1 answers · asked by My pic looks good 2 in Chemistry

2007-09-23 02:02:07 · 5 answers · asked by Anonymous in Zoology

If the astroid belt lies inbetween earth and Jupiter?
Please explain why!

Please dont make the answer to complicated though because im 14 and understand very little physics!!
Thanks!!

2007-09-23 01:49:04 · 6 answers · asked by Anonymous in Astronomy & Space

this is a question for my science revision. im 14 though so please dont make the answer complicated to understand!

Oh and also, aparently the steady state theory is about the origin of the universe? What is it?

2007-09-23 01:47:33 · 6 answers · asked by Anonymous in Physics