Science & Mathematics - 16 November 2006

2006-11-16 08:48:26 · 6 answers · asked by STORMY K 3 in Weather

Not necessarily looking for an answer from an engineer but answers from people of ordinary skill.

2006-11-16 08:47:14 · 4 answers · asked by fhmaven 1 in Engineering

who is the best cientific of the history.

2006-11-16 08:45:27 · 21 answers · asked by gandalf 2 in Physics

2006-11-16 08:45:26 · 6 answers · asked by sharon m 1 in Astronomy & Space

2006-11-16 08:45:19 · 9 answers · asked by jm_collision 1 in Astronomy & Space

2006-11-16 08:45:00 · 4 answers · asked by STORMY K 3 in Medicine

2006-11-16 08:44:59 · 2 answers · asked by AlmondJoy7 1 in Chemistry

2006-11-16 08:44:21 · 12 answers · asked by Diana K 1 in Earth Sciences & Geology

There is a light source located over the center of a circular table of diameter 4 ft. find the heigh h of the light source such that the illiumination I at the perimeter of the table is maxium if I=k(sina)/s^2 where s is the slant height, a is the angle at which the light strikes the table, and k is a constant.
so what i did was take the I equation and solve for h and s using the sin of a whcih is h/s in the triangle, and solved for s, and i solved for h using the tan of a which is h/2...i got the equation
k sin a
--------
4sec^2(x)
now i dont know what to do.
im supposed to take the derivative, but its messy with the sina over sec squared x.
what do i do/how do i take the derivative?

2006-11-16 08:44:01 · 1 answers · asked by Anonymous in Mathematics

Consider an equal mass of water at liquid state and water vapour both at the same temperature (say 300K).
Is the internal energy of the water at liquid state higher than the internal energy of water vapour of the same temperature?
I need clear justification on this.
All i know is, internal energy of a system is defined as the sum of microscope KE and PE of the molecules in the system.
In gas such as water vapour, intermolecular forces of attraction is weak and hence it has low PE.(correct me if i'm wrong)
Since they are at the same temperature, both systems have the same KE?
So my conclusion is water in liquid is at a higher energy state. I'm very skeptical about this conclusion. A gas should be at a higher energy state....

2006-11-16 08:43:09 · 7 answers · asked by Anonymous in Physics

If one and a half chicken lay one and a half eggs in one and a half days...
How many eggs will nine chicken lay in nine days?

[testing the public again]

2006-11-16 08:43:01 · 10 answers · asked by Anonymously Anonymous 5 in Mathematics

3+(-5)+(-17)=

2006-11-16 08:42:00 · 5 answers · asked by yupp 1 in Mathematics

How woulg you graph y = | 3 - y |
(ABSOLUTE VALUE)

How would you get "y=" form for : x = | 3 - y| and x = y

2006-11-16 08:41:35 · 2 answers · asked by The Ultimate Answerer 3 in Mathematics

If I wanted to envision what 1g of sugar looked like as a sugar cube, what dimensions would it have?

Please give me some math, or I'll likely just think you are guessing!

2006-11-16 08:41:08 · 3 answers · asked by Anonymous in Mathematics

2006-11-16 08:40:55 · 10 answers · asked by STORMY K 3 in Weather

2006-11-16 08:40:24 · 7 answers · asked by k.m.t.e.harvey@btinternet.com 2 in Mathematics

simplify

2006-11-16 08:39:39 · 8 answers · asked by chelsea y 1 in Mathematics

When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 75 kg man just before contact with the ground has a speed of 6.2 m/s.

(a) In a stiff-legged landing he comes to a halt in 1.7 ms. Find the average net force that acts on him during this time.

273529.41 N

(b) When he bends his knees, he comes to a halt in 0.08 s. Find the average force now.

5812.5 N

(c) During the landing, the force of the ground on the man points upward, while the force due to gravity points downward. The average net force acting on the man includes both of these forces. Taking into account the directions of these forces, find the force of the ground on the man in parts (a) and (b). stiff legged landing and bent legged landing.

i've found a and b. just can't seem to get the force of the ground. any help?

2006-11-16 08:38:25 · 1 answers · asked by Any help? 1 in Physics

i need hepl!!!!111

2006-11-16 08:36:56 · 2 answers · asked by Anonymous in Geography

angle=38 degrees

opp=38m

thanx in advance

2006-11-16 08:35:50 · 9 answers · asked by rossmcloone 1 in Mathematics

equation:
f(x) = (3x) / (x-1)

i know i have to switch the "x" and "y", therefore giving me:

x = (3y) / (y-1)

now i'm stuck. do i cross multiply then factor? thanks for the help.

2006-11-16 08:35:17 · 2 answers · asked by shih rips 6 in Mathematics

simplify the following fraction

2006-11-16 08:35:03 · 8 answers · asked by chelsea y 1 in Mathematics

multiply and express the product in the simplest form

2006-11-16 08:32:33 · 7 answers · asked by chelsea y 1 in Mathematics

eg 3 4
- -
5 = or 25 =
-

2006-11-16 08:30:25 · 8 answers · asked by k.m.t.e.harvey@btinternet.com 2 in Mathematics

Compare by periodic properties!
Thanks

2006-11-16 08:29:52 · 7 answers · asked by Angel Eve 6 in Chemistry

Just checking if I have it right- Thanks

Equations:

13 + (12) - (-5) =

2006-11-16 08:27:11 · 5 answers · asked by yupp 1 in Mathematics

2006-11-16 08:26:43 · 9 answers · asked by Anonymous in Biology

Is it is as easy as taking the difference (in minutes) between sundown on the the longest day and the shortest day (adjusting for daylight savings) and then dividing this number by 182 (ie. the number of days in a half year)?

2006-11-16 08:25:24 · 4 answers · asked by Anonymous in Weather

Thinkness (layers): 2 4 6 8
Breaking weight: 15 30 50 65

Please help! whats the pattern? And the breaking weight for Thickness: 3,5,7.
Thanks so much!!

2006-11-16 08:25:09 · 2 answers · asked by Amanda S 1 in Mathematics

Hydrogen can gain one electron to reach a stable electron configuration. Why isn't hydrogen placed in group 7A with the other elements that share this behavior?

2006-11-16 08:24:06 · 7 answers · asked by E 2 in Chemistry