Science & Mathematics - 4 November 2007

Ok the book gave me the answer to this problem. I need to know how they got to this answer. If you divide 20 into 60 and into 40 you get 3/2 which then =1.5, but why 20 and how do you get 1.5 out of 3/2? PLease help me and give me step by step.
Thank you lots
Bridgette

2007-11-04 03:00:13 · 4 answers · asked by Bridgette H 1 in Mathematics

2007-11-04 02:58:35 · 2 answers · asked by cutiemr 1 in Biology

2007-11-04 02:54:50 · 26 answers · asked by Anonymous in Mathematics

WHERE DO THEY GO?
WHAT DO THEY DO?

2007-11-04 02:52:52 · 2 answers · asked by jarthur68 1 in Zoology

1. 86.4g
2. 60.2g
3. 84.28g
4. 82.68g

2007-11-04 02:52:50 · 2 answers · asked by Raisa S 1 in Chemistry

Consider a two slit interference pattern, for which the intensity distribution is given by

I = I(not) cos^2 (pi*d*sin(theta) / lamda)

Let θm be the angular position of the mth bright fringe, where the intensity is I(not). Assume that θm is small. Let θm+ and θm- be the two angles on either side of θm for which I=½I(not). The quantity Δθm= |θm+ -θm-| is the half-width of the mth fringe. Calculate Δθm. How does Δθm depend on m?

2007-11-04 02:48:40 · 3 answers · asked by Anonymous in Physics

Determine the Maximum or Minimum value for each quadratic function:

b) f(x)=2 (x-4) (x+6)
and
c) f(x)= -2x^2 +10x

Please show all steps and explain if possible, thank you.

2007-11-04 02:46:19 · 6 answers · asked by Anonymous in Mathematics

Why not H20? Why salt? And why do we even sweat?

Thanks!

2007-11-04 02:45:28 · 3 answers · asked by Brad 3 in Biology

We climbed to the peak of Manzano Mountains in New Mexico - approx 10,000 to 11,000 feet, and found shell and coral fossils. How did they get there? How were the mountains formed? Upheaval? Volcanic? Was there sea life millions of years ago when earth was covered with water, and was the sea level above 11,000 feet? Gosh, I am a dope when it comes to geology. Don't laugh, please.

2007-11-04 02:42:40 · 7 answers · asked by ava 2 in Earth Sciences & Geology

~ Calculate the amount of interest you'll have at the end of the indicated period.~

Question: You invest $98,600 in an account that pays simple interest of 3% for 2 years?

the answer is $5916.00, i just need help with how to do the problem. Thanks!

2007-11-04 02:39:28 · 9 answers · asked by cassie05 3 in Mathematics

2007-11-04 02:37:31 · 5 answers · asked by Anonymous in Mathematics

I just purchased a WO megrez 90mm APO. I want to do star testing so I looked up a few web sites on it because ive never done it before and I wanted to test the lenes. They said you should see concentric rings but all I saw was one two rings.The pics they showed had 5-7 rings or so. Also I am getting a very small amount of comet tails on the stars on the very outer edge ( when in focus) . I guess my question is... how much does the quality of the eyepiece effect testing of the scope? should I be using Neglers.......I dont have one

2007-11-04 02:31:48 · 4 answers · asked by comethunter 3 in Astronomy & Space

I know I sound like a crack head but I do believe in UFO's and other life out there. I also believe the government knows about it (not just the U.S.) and they are hiding the truth from us. It will all come out someday!

2007-11-04 02:29:34 · 9 answers · asked by honeybear 5 in Astronomy & Space

2007-11-04 02:28:07 · 2 answers · asked by Anonymous in Zoology

2007-11-04 02:22:25 · 4 answers · asked by Anonymous in Mathematics

Right now it is 74 km (not miles) an hour with gusts up to 102 km per hour. At what point is it a huricane. The house kinda shakes now and than. I just moved here so I don't know, is this normal for living by the ocean?

2007-11-04 02:21:01 · 4 answers · asked by Anonymous in Weather

The number of cells in a tumor doubles every 3.0 months. If the tumor begains as a single cell, how many cells will there be after 3 years?

2007-11-04 02:19:42 · 6 answers · asked by cassie05 3 in Mathematics

2007-11-04 02:19:29 · 8 answers · asked by <3 2 in Biology

Communications satellites are placed in a circular orbit where they stay directly over a fixed point on the equator as the earth rotates. These are called geosynchronous orbits. The altitude of a geosynchronous orbit is 3.58 x 10^7m. What is the period of the motion? What is the value of g at this orbit? What is the apparent weight of a 2000kg satellite at this g?




Now, I found the period to be 24hr, and the value of g to be 0.223m/s/s. But I cannot seem to find a formula to correctly calculate the apparent weight of the satellite with this information.

2007-11-04 02:18:52 · 3 answers · asked by Anonymous in Physics

An object is released from an aeroplane which is diving at angle of 30 degrees to the horizontal with a speed of 50 m/s. If the plane is at a height of 4000m from the ground when the object is released find
(a) the velocity of the object when it hits the ground
(b) the time taken by object to reach the ground
take g=9.81 m/s^2

2007-11-04 02:15:08 · 1 answers · asked by Always 4 U 2 in Physics

Math teacher gave us a project, but I have no idea how to do it, can u explain it, or show me how to do it?

"applying the "compeating the square" method to the equation given above, show that it's roots (values of x) are expressed by the quadratic formula:

equation given above- a(x squared) + bx +c = 0

2007-11-04 02:07:13 · 3 answers · asked by Joey 1 in Mathematics

complete the square of circle with centre c x^2 + y^2 -8x=6y=11 in the form (x-a)^2 + (y-b)^2 = r^2

then find the coordinates of c and the radius of the circle

c0 then o point has coordinates (0,0)
find teh length of co and determine whether point o lies inside or outside the circle with a reason

2007-11-04 02:05:34 · 3 answers · asked by Anonymous in Mathematics

not like a disease but just a regular itch- not from feathers and stuff either

2007-11-04 01:45:49 · 1 answers · asked by Anonymous in Physics

Here it is:

mrs. mahoney went shopping for some canned goods which were on sale. she bought 3 times as many cans of tomatoes as cans of peaches. the number of cans of tuna was twice the number of cans of peaches. if mrs. mahoney purchased a total of 24 cans, how many of each did she buy?

i think the equation if x = peaches, then
x times 3 + x times 2 = 24
ive tried everything and i cant reach it

please help

2007-11-04 01:44:37 · 8 answers · asked by cheshirecat192 3 in Mathematics

please could anyone tell me the awnser to my question i really need the help.

2007-11-04 01:43:05 · 6 answers · asked by Anonymous in Zoology

Or might people abuse them? What are your opinions and why?

2007-11-04 01:43:05 · 5 answers · asked by Anonymous in Medicine

help anyone? i cant find anything on google. i have to answer this question for my biology research ¬_¬

cheers. :]

2007-11-04 01:40:04 · 14 answers · asked by *N[dot]R* 1 in Zoology

x + y + z = 10

No of solutions :
-------------------------
If x,y,z are real - infinite

If x,y,z non negative integers- 66 ........(1)

if x,y,z positive integers then - 36.........(2)


whats the difference between (1) and (2) ?

2007-11-04 01:38:57 · 3 answers · asked by calculus 1 in Mathematics

2007-11-04 01:37:46 · 3 answers · asked by Ahmed A 1 in Physics

does anyone know what causes the snake bite reflex to still take action even after the snake has been killed or even the head been cut off. any help about this would be much appreciated since google is annoying me with it at the moment
much thanks
hayley

2007-11-04 01:34:06 · 3 answers · asked by Anonymous in Biology