Science & Mathematics - 19 October 2007

2007-10-19 07:58:36 · 9 answers · asked by Anonymous in Engineering

2007-10-19 07:58:08 · 10 answers · asked by tankwillmsg 1 in Mathematics

how does it differ in earth, the moon, and all the other planets????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

2007-10-19 07:57:10 · 9 answers · asked by jojoboy 2 in Astronomy & Space

2007-10-19 07:56:49 · 6 answers · asked by Kenneth George Houdek 3 in Astronomy & Space

2007-10-19 07:55:18 · 14 answers · asked by Someone 1 in Botany

2007-10-19 07:54:52 · 5 answers · asked by Anonymous in Engineering

how do i find the OH?

2007-10-19 07:50:51 · 4 answers · asked by Dirty S 1 in Chemistry

An airplane with a speed of 97.5 m/s is climbing upward at an angle of 50 degrees to the horizontal. When the plane's altitudeis 732 m, the pilot releases a package. Relative to the ground, determine the angle of the velocity vector of the package just before impact.

2007-10-19 07:49:26 · 1 answers · asked by Anonymous in Physics

what are the names of the countries that make up great britain

2007-10-19 07:46:10 · 11 answers · asked by Anonymous in Geography

a) Sodium and cesium
b) Potassium and bromine

2007-10-19 07:44:56 · 3 answers · asked by Kristyn 1 in Chemistry

1. |a| + 6 = 9

A) a = 3 or a = -3

B) a = 3 or a = -15

C) a = 3 or a = 15

D) a = -3 or a = 15

2. |2x + 3| = 7

A) x = 4 or x = 10

B) x = 4 or x = -10

C) x = 2 or x = 5

D) x = 2 or x = -5

2007-10-19 07:43:08 · 3 answers · asked by ketch 1 in Mathematics

2007-10-19 07:42:23 · 2 answers · asked by David A 2 in Zoology

the reason why i ask is my cousin seems to think the earth is now called the cradle and it is just a stepping stone untill we are ready to leave on our merry way

2007-10-19 07:42:11 · 17 answers · asked by wankalot 1 in Astronomy & Space

Why are some elements more reactive than others?

2007-10-19 07:41:28 · 3 answers · asked by Kristyn 1 in Chemistry

thjis question has been bothering me for ages!!

2007-10-19 07:38:49 · 9 answers · asked by Anonymous in Earth Sciences & Geology

3 consecutive even integers are so that the sum of the 2 larger integers is 232 more than 3 times the smallest integer.

2007-10-19 07:38:15 · 3 answers · asked by crystalie t 1 in Mathematics

A semicircle with diameter PQ sits on an isosceles triangle PQR to form a region shaped like a two-dimensional ice cream cone. If A(theta) is the area of the semicircle and B(theta) is the area of the triangle, find: limit, as theta approaches 0 from the right, of A(theta)/B(theta). Sides of the triangle: side PR=10 cm, side QR=10 cm and side PQ forms the bottom of the semicircle. The angle of the bottom of the cone (corner R) is equal to theta.


(this problem is sooo confusing. i will give best answer to the first person to solve it. Thanks!)

2007-10-19 07:35:59 · 3 answers · asked by jeremy s 2 in Mathematics

2007-10-19 07:33:31 · 3 answers · asked by *gemma* 2 in Engineering

2007-10-19 07:29:28 · 13 answers · asked by afields3 1 in Mathematics

this is a derivatve question

2007-10-19 07:26:16 · 1 answers · asked by donpierro 1 in Mathematics

2007-10-19 07:20:58 · 5 answers · asked by bibobum 2 in Mathematics

Two stones are thrown simultaneously, one straight upward from the base of a cliff and one straight downward from the top of a cliff. The height of the cliff is 6 m, and the stones are both thrown at a speed of 9 m/s. The height above the ground at which they cross is...

2007-10-19 07:16:26 · 1 answers · asked by Anonymous in Physics

An electron has a de Broglie wavelength of 240nm, What is the speed of the electron? I dont get how to do this sompel please help.

2007-10-19 07:10:54 · 2 answers · asked by Cannot Think of Name 2 in Chemistry

show the work

2007-10-19 07:08:00 · 5 answers · asked by Shawty 1 in Mathematics

A 10.0-g sample of a mixture of CH4 and C2H4 reacts with oxygen at 25.0oC and 1.00 atm to produce CO2(g) and H2O(l). If the reaction produces 545 kJ of heat, what is the mass percentage of CH4 in the mixture?

I would appreciate any help, I have tried this so many times...

2007-10-19 07:07:00 · 4 answers · asked by Anonymous in Chemistry

2007-10-19 07:05:52 · 6 answers · asked by Anonymous in Chemistry

This has to do with Newtons Law. Thanks a lot guys.

Question: Two buckets of sand hang from opposite ends of a rope that passes over an ideal pulley. One bucket weighs 105 N; the other bucket weighs 48 N. (Assume no friction)

a.) Initially, you hold onto the lighter bucket to keep it from moving. What is the tension in the rope?

_______ N

b.) You release the lighter bucket and the heavier one descends. What is the tension in the rope now?

_______ N


c.) Eventually the heavier bucket lands and the two buckets come to rest. What is the tension in the rope now?

_______ N


Again thanks a lot!!!

2007-10-19 07:03:14 · 5 answers · asked by acousticplaya90 1 in Physics

2007-10-19 07:01:14 · 17 answers · asked by whazzah 2 in Biology

1) A infrared photon has a frequency of 9,469 GHz. What is its wavelength in centimeters (cm)?

2) Which of the following transitions of a single electron would require the absorption of a photon of light with the shortest wavelength?
Answer choices:
a) n = 3 to n = 2
b) n = 1 to n = 4
c) n = 2 to n = 4
d) n = 5 to n = 1
e) n = 3 to n = 5

3) Which is not a possible ml value for an orbital that has the following:
n = 6, l = 2
Ans choices:
a) -1
b) +1
c) -2
d) -3

2007-10-19 06:59:35 · 1 answers · asked by hey there! 1 in Chemistry

a lot of swords nowadays are being made out of stainless steel and high carbon steel, but what would be an extremely tough metal to make a sword out of so it would be tough enough to slice through concrete, trees, and metal without marring the blade?

2007-10-19 06:58:53 · 5 answers · asked by Jonny Mick 2 in Chemistry