Science & Mathematics - 15 September 2007

2007-09-15 16:19:37 · 14 answers · asked by cliffhanger 1 in Earth Sciences & Geology

What is the net force acting on a 25-N freely falling object? What is the net force when the object encounters 15 Nof air resistence? When it falls fast enough to encounter 25 N of air resistence?

2007-09-15 16:14:35 · 1 answers · asked by Anonymous in Physics

2007-09-15 16:10:40 · 7 answers · asked by Akilesh - Internet Undertaker 7 in Mathematics

I've heard there wasn't really a "discovery date" for Stonehenge because it's always been around, but wasn't there a time when scientists came across it and said, "Hmm, this requires further investigation..." right? When was that? And if I were to say the "discovery date" is in the last 250 years, would I be right?

2007-09-15 16:10:36 · 6 answers · asked by Anonymous in Astronomy & Space

A woman drove part of a 185 mi trip at 50 mi/h and the rest at 55 mi/h. Find the distance she traveled at 50 mi/h if her total driving time was 3 hours and 30 minutes.

Explain all the steps and everything as clear as possible. I tried doing the problem and I can't get it right....

Here are the 4 possible answers...

A) 110 mi
B) 100 mi
C) 75 mi
D) 150 mi

2007-09-15 16:09:26 · 5 answers · asked by Anonymous in Mathematics

Calculate the total number of molecules in the sample? How many atoms are present in the 2.8 mg sample?

2007-09-15 16:08:47 · 2 answers · asked by Will R 1 in Chemistry

You know how they said that we evolved form apes and stuff,and noahs ark?And that a giant meteorid crashed into the planet and killed off all the dinosaurs?What I think is that..ok,the dinosaurs could have lived at the same time as dinosaurs,and the humans had no idea of it,and then a meteroid crashed into the planet wiping out all humans and dinosaurs,and at the same time,creating lakes and rivers all around the world.Then they could have filled up with water after the flood as mentioned in Noahs Ark,filling the big holes in the ground with water(that the meteorids created)And then all the dinosaurs and humans drowned.Then God shows up and creates more humans.Then the continent(known as Pangea back then millions of years ago or so) splits up into what we now call like North America,Russia,Europe,Africa,A... so on.
Then as the years pass,we humans learn about the world and how it functions,we learn how to survive!ANd besides,someone had to have created apes too!

2007-09-15 16:08:38 · 5 answers · asked by Anonymous in Earth Sciences & Geology

I know its wrong to ask Yahoo Answer to help u do ur homework... but i am completely puzzled so can somebody plzz help me factor this


2x^3+5x^2-8x-20


many thanks to anyone that decides to help me :-) :-)

2007-09-15 16:07:49 · 4 answers · asked by ♥ ©o©oA ♥ 4 in Mathematics

Determine the number of moles the following. N atoms in a sample of C7H5(NO2)2 that has the same number of O atoms as 50.0 g C6H12O6

2007-09-15 16:04:59 · 1 answers · asked by Anonymous in Chemistry

1. A mountain is 10,000 feet high. When you hold your arm straight out, three fingers cover the mountain to your view. How far away are you from the mountain?

2. A new planet is discovered orbiting the sun. It is 30 AU (astronomical unit) away. How many years does it take to orbit the sun?

3. The Ulysses space probe was sent in orbit around the sun to study it. If it takes 0.25 years to orbit, how far away from the sun is it?

4 What maximum angle could it make to your eye at sunset?

5. A comet takes 100 years to orbit the sun (a) Calculate its average distance R from the sun. (b) The comet gets as clode as 2 AU from the sun. How far away does it get?

6. A planet is 2 AU from a star and takes 2 years to orbit it (a) Find K for this star. (b) Is this star more massive or less massive than our sun? choose one

** it would be great if you could provide work so i can understand it much better. Thanks!!!

2007-09-15 16:04:00 · 2 answers · asked by medicated kiss 2 in Astronomy & Space

2007-09-15 16:00:40 · 6 answers · asked by Anonymous in Mathematics

I don't understand how hard water is formed?

2007-09-15 16:00:14 · 4 answers · asked by Anonymous in Chemistry

2007-09-15 15:56:52 · 5 answers · asked by texan3715 1 in Mathematics

2007-09-15 15:56:08 · 6 answers · asked by Anonymous in Physics

I would like to have the wind and water element...suiton is pretty cool and fuuton is powerful.

2007-09-15 15:55:52 · 2 answers · asked by eric_jvr 1 in Chemistry

question 2.
vector a has a magnitude 10 and makes an angle of 75 degrees with x-axis. Calculate X and Y components of vector a.

2007-09-15 15:51:30 · 4 answers · asked by scorrea54 1 in Mathematics

2007-09-15 15:51:09 · 11 answers · asked by Help Me With Homework :) 1 in Mathematics

weight of Ca 2+

2007-09-15 15:50:16 · 1 answers · asked by summitgirl06 1 in Chemistry

Is the absolute value of
I pi^2 - 10 I
the same thing minus the abs. value signs?
Just imagine the pi^2 to be the pi symbol squared.

2007-09-15 15:48:33 · 10 answers · asked by Joy 2 in Mathematics

probability no one makes an A is?

a. 0.15
b. 0.65
c. 0.85
d. 0

2007-09-15 15:47:14 · 3 answers · asked by Anonymous in Mathematics

There are 5 distinct pair of white socks and 5 pairs of black socks in a cupboard. In the dark, how many socks do I have to pull out to ensure that I have atleast 1 correct pair of white socks.

2007-09-15 15:47:05 · 10 answers · asked by Harry 1 in Mathematics

What is the velocity of car 2 relative to car 1? Help Physics question??Thanks :)?
Two cars approach a street corner at right angles to each other. Car 1 travels at a speed relative to Earth v1E = 27 km/h, and car 2 at v2E = 51 km/h.

(a). What is the relative velocity of car 1 as seen by car 2?
57.71 km/h; 62.103° (west of north)

(b). What is the velocity of car 2 relative to car 1?
........km/h;.......° (south of east)


Please help me to do this Physics Question? i got the first questions and it turns out to be right..but how do i get the velocity of car 2 relative to car 1?????????? please show the work also ..Thanks :)

2007-09-15 15:45:18 · 2 answers · asked by Nikita 1 in Physics

and 8 copies of a draw program. Three of the word processing , four of the spread sheet, and two of the draw programs are infected with a computer virus. If a program is selected at random, the probability it is infected with a virus?

a. 11/30
b.7/30
c. 3/10
d. 1/4

2007-09-15 15:42:50 · 5 answers · asked by Anonymous in Mathematics

2007-09-15 15:41:37 · 14 answers · asked by Anonymous in Mathematics

A major league pitcher can throw a baseball in excess of 46.7 m/s. if a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 19.2 m away from the point of release?

2007-09-15 15:41:04 · 3 answers · asked by Anonymous in Physics

I need help! And thanx for all the answers!!! :)

2007-09-15 15:40:46 · 11 answers · asked by aquasahara 2 in Mathematics

2007-09-15 15:40:33 · 3 answers · asked by Dr NO 5 in Zoology

thanks in advance...
kindly put your source (if you have, thanks again)

2007-09-15 15:39:52 · 2 answers · asked by -three31one- 1 in Medicine

2007-09-15 15:39:16 · 3 answers · asked by Anonymous in Physics

is the least common multiple of 16 and 18=114??
is the least common multiple 144? please help thanks

2007-09-15 15:34:45 · 8 answers · asked by francine n 1 in Mathematics