Science & Mathematics - 16 September 2007

That is, how can you calculate roughly how tall someone was by measuring their footprint?

2007-09-16 12:03:02 · 1 answers · asked by Dan X 4 in Biology

(taken from the book)

A wire 36 m long is cut into 2 pieces. Each piece is bent to form a rectangle which is 1 cm longer than it is wide. How long should each piece be to minimize the sum of the areas if the two rectangles?

2007-09-16 12:01:07 · 5 answers · asked by Anonymous in Mathematics

for 0<=x<360

2007-09-16 11:59:05 · 4 answers · asked by freakokalam 2 in Mathematics

2007-09-16 11:58:16 · 1 answers · asked by kimberlinus 1 in Physics

A small source of light "S" is located at a distance "L" from a vertical wall. An opaque object with a height of "h" moves toward the wall with constant velocity " v(arrow) " of magnitude "v" . At time t=0 , the object is located at the source "S" .

Find an expression for v(s), the magnitude of the velocity v(s)(arrow) of the top of the object's shadow, at time t .
Express the speed of the top of the object's shadow in terms of t ,v ,L, and h

2007-09-16 11:56:15 · 1 answers · asked by Tommy 2 in Physics

A rock climber throws a small first aid kit to another climber who is higher up the mountain. The initial velocity of the kit is 21 m/s at an angle of 55° above the horizontal. At the instant when the kit is caught, it is traveling horizontally, so its vertical speed is zero. What is the vertical height between the two climbers?

2007-09-16 11:55:46 · 1 answers · asked by Anonymous in Physics

supplies is ejected horizontally backward with a speed of 14 m/s relative to the helicopter. Ignoring air resistance, what is the horizontal distance between the package and the helicopter when the package hits the ground?

2007-09-16 11:50:42 · 4 answers · asked by billy w 1 in Physics

2007-09-16 11:49:13 · 2 answers · asked by Andrew M 1 in Earth Sciences & Geology

Now that graphic novels are so popular, this very visual distinction is very cool, yes? Helpful for clarity too?

2007-09-16 11:47:16 · 2 answers · asked by clopha 2 in Earth Sciences & Geology

2007-09-16 11:47:07 · 20 answers · asked by Idina 1 in Geography

Just build a rocket and go, simple as that. How hard could it be.

2007-09-16 11:39:50 · 8 answers · asked by Anonymous in Astronomy & Space

i never learned about brackets and i have no clue how to solve this problem. do brackets act just like the () in this equation? you're supposed to solve for X. and show your work

2[x+5(2x+4) -8] = -(x+9)

2007-09-16 11:38:34 · 10 answers · asked by Anonymous in Mathematics

-Periodic Table

2007-09-16 11:29:51 · 3 answers · asked by tankaboy91 1 in Chemistry

2007-09-16 11:27:45 · 3 answers · asked by Anonymous in Biology

I know they were arranged first by atomic mass and then later atomic numbers, but why couldn't they first arrange it base on colour, state and taste of the elements? Was it because it was too different and consist of no similarities?

2007-09-16 11:24:57 · 10 answers · asked by Annoymous 1 in Chemistry

-which mountain range acs as a boundry between the continents of europe and asia?

-which mountain range formed when the plate containing the indian subcontinent bumped into the continent of asia?

-which imaginary line of laditude divides the earths northern and southern hemispheres? which two hemispheres can north america be found?

-what body of water does the amazon empty into?

-what large island is located off the eastern coast of africa?



-which large country if found partly in europe and partly in asia?

-what european country is located just north or africa? what ocean borders this country?

-what country makes up nearly half of south america?

-what country is also a continent? what three large countries make up north america?

-what are three countries found on the asian continent?

2007-09-16 11:23:35 · 8 answers · asked by Anonymous in Geography

a car with a wheel of radius 14 inches is moving with a speed of 55 mph. find the angular speed of the wheel in radians per second.

i need help on how to get to the answer. like how do i convert from 55mph to radians per second. and how do i put it in the formula?

2007-09-16 11:23:13 · 1 answers · asked by Anonymous in Mathematics

4x^2-9...please,

2007-09-16 11:21:03 · 8 answers · asked by mariacruztexas 1 in Mathematics

2007-09-16 11:19:38 · 5 answers · asked by Anonymous in Astronomy & Space

2x^4y-162y Help factoring it and explain please.

2007-09-16 11:17:46 · 1 answers · asked by Anonymous in Mathematics

1. How long will a stick of incense last?
2. Favorite "flavors"?
3. Is it harmful for any medical reason?

2007-09-16 11:17:35 · 2 answers · asked by lily9flower9 2 in Medicine

Isn't it possible for super heated plasma gas to burn a greenish colour?

2007-09-16 11:12:11 · 5 answers · asked by Anonymous in Astronomy & Space

2007-09-16 11:09:00 · 13 answers · asked by jhilgert00 1 in Astronomy & Space

How is the irrational number pi related to the Bible?

2007-09-16 11:08:46 · 8 answers · asked by Anonymous in Mathematics

Does the UNIVERSE have a boundary or OUTER LIMIT?

Do you think that our Universe has a boundary?

What would you expect to see if you were to reach this boundary?

2007-09-16 11:06:37 · 9 answers · asked by Anonymous in Astronomy & Space

Can someone please give me some example problems of two-dimensional trajectory?? They can range from easy to hard, but they need to be worked out step by step. I am asking this because i don't know how to do these kind of problems for my physics class. (my teacher doesn't teach us) so i have homework, and i don't know how to do it. but instead of me asking you people to do it for me, i need you to give me some examples. that way i will be able to do my homework on my own. thank you so much :)

2007-09-16 11:05:13 · 1 answers · asked by Anonymous in Physics

Ok the problem is:
(3x^3-2ax^2+bx+1) - (cx^3+5x^2-7x+9) = -x^3+x^2-2x+4d
I am so confused, especially on how to add and subtract the exponents. Can you explain this to me?

2007-09-16 11:03:35 · 6 answers · asked by DD 2 in Mathematics

2007-09-16 11:02:54 · 13 answers · asked by richard p 1 in Astronomy & Space

how far dose the rain fall from up above

2007-09-16 11:00:00 · 9 answers · asked by Anonymous in Weather

A major leaguer hits a baseball so that it leaves the bat at a speed of 38.0 m/s and at an angle of 36.9° above the horizontal. You can ignore air resistance. (Assume upward is positive.)

a)At what two times is the baseball at a height of 13.0 m above the point at which it left the bat?
first time ________s
second time_______s

b) Calculate the horizontal and vertical components of the baseball's velocity at each of the two times calculated in part (a).
first time
____m/s (horizontal)
____m/s (verticle)
Second Time
____m/s (horizontal)
_____m/s (verticle)
(c) What is the magnitude and direction of the baseball's velocity when it returns to the level at which it left the bat?
_____m/s
______ degree (below the horizontal)

2007-09-16 10:58:50 · 1 answers · asked by Anonymous in Physics