Science & Mathematics - 15 August 2007

2007-08-15 18:05:57 · 2 answers · asked by david m 2 in Engineering

I went on a cruise just this last week. I noticed that in Houston the sun set past 8 p.m. central time. Then, while in the Carribean Sea, then sun set at 6:40ish. I thought that the closer to the equator you were, the later the sun set. We were hundreds of miles south of the Tropic of Cancer and the Sun is still overhead the northern hemisphere. Please help with this question. I am knowledgeable in science, but this question is driving me crazy!

2007-08-15 18:03:29 · 9 answers · asked by bob 1 in Earth Sciences & Geology

2007-08-15 18:00:55 · 2 answers · asked by Anonymous in Medicine

How did 'sex' and 'gender' evolve? How infinitely improbable is it that two creatures randomly envolved into other creatures that are made for each other?

2007-08-15 17:55:13 · 13 answers · asked by Banana Hero 1 in Biology

2007-08-15 17:53:02 · 9 answers · asked by Anonymous in Other - Science

2007-08-15 17:51:53 · 3 answers · asked by Anonymous in Weather

Find the equation of the ellipse that satisfy the given condition


heres the exact given taken from my quiz just 1 hour ago.

assuming that x^2/a^2 + y^2/a^2 is given. passing through (2,3), the latus rectum is 3 times the distance from the center to the focus.

how go get this?

2007-08-15 17:51:16 · 2 answers · asked by Patricia 2 in Mathematics

What are three differences in the structure and operation of photocells and photovoltaic cells?

2007-08-15 17:50:58 · 2 answers · asked by th3one101 2 in Physics

Then the tectonic plates would start moving in the other direction right? Would it start out at a much faster speed, or would this happen slow and gradual. Would there be earthquakes all over or would the change be unnoticeable? Would the barrier that stops much of the radiation from space be let down for a couple seconds allowing a lot of damage to the Earth? Then the fault line would be dividing in Australia and coming together in the Atlantic and causing the canal between Egypt and the Arab nations to close again? Of course this would take a long time right, but I want to know all the juicy details if you can please assist me. Thank you.

2007-08-15 17:49:22 · 4 answers · asked by ? 3 in Earth Sciences & Geology

A hallow cylinder is positioned vertically such that its axis is orthagonal to the ground. A small ball is placed inside of the cylinder and made and made to revolve around the inside of the cylinder. Picture a marble whirling around the inside of a coffee can that is sitting in a normal position. The coefficient of static friction between the ball and the cylinder wall is assumed to be infinite, in other words the points of contact of the cylinder and ball have itentical velocities and no slipping occurs provided there is any arbitrary amount of normal force. The question: at what speed, if any, will the ball continue to revolve around the cylinder without spiraling down into it? Keep in mind that the ball has angular momentum parallel to its axis of rotation, and that the ball cannot slip down the sides, it must roll. Keep also in mind that if the angle of the balls axis changes to that of the cylinder then the circle defining the points of contact will no longer be the equator.

2007-08-15 17:48:08 · 5 answers · asked by damonago45 2 in Physics

About 1-2 years ago, around 10 PM, I was trying to go to sleep in my bed in my room. All of a sudden, I hear some fingers tapping on my door, and I just think it will eventually stop. However, after 10 minutes, the tapping grows louder, and it sounds like there was a million fingers tapping on my door. It keeps going for about 20-30 minutes, my heart is beating fast, so I get the courage to go up and open the door, and nothing was there. After I closed the door, the tapping never returned. I live with my parents, but I doubt they could've made this much noise. It is possible that it was my door creaking, but I had never heard a door creak like that in my life. What could have happened?

2007-08-15 17:47:49 · 19 answers · asked by Just Me 2 in Paranormal Phenomena

okay.
is sand
pure substance?
or
mixture?
if it is.
is it homogenous or hetergeneous mixture?

2007-08-15 17:47:37 · 7 answers · asked by Anonymous in Chemistry

The polynomial function with a degree of 5 with -2 as a zero of multiplcity of 3, 0 as zero of a multoplicity of 1, and 2 as a zero of multiplcity 1.
i know the answe is something like this, but im not 100% sure..

x^5 + 2x^4 - 4x^3 - 4x^2

does this look right ?

2007-08-15 17:43:31 · 2 answers · asked by sf 1 in Mathematics

Most of the human body is made up of water, H2O, with cells consisting of 65-90% water by weight. Therefore, it isn't surprising that most of a human body's mass is oxygen. Carbon, the basic unit for organic molecules, comes in second. 99% of the mass of the human body is made up of just six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.

1. Oxygen (65%)
2. Carbon (18%)
3. Hydrogen (10%)
4. Nitrogen (3%)
5. Calcium (1.5%)
6. Phosphorus (1.0%)
7. Potassium (0.35%)
8. Sulfur (0.25%)
9. Sodium (0.15%)
10. Magnesium (0.05%)
11. Copper, Zinc, Selenium, Molybdenum, Fluorine, Chlorine, Iodine, Manganese, Cobalt, Iron (0.70%)
12. Lithium, Strontium, Aluminum, Silicon, Lead, Vanadium, Arsenic, Bromine (trace amounts)

So yet why can we not make humans ourselfs? What is missing?

2007-08-15 17:43:14 · 2 answers · asked by Anonymous in Chemistry

2007-08-15 17:42:46 · 6 answers · asked by rdmlawsky147 1 in Engineering

how can i get in touch with my family in peru...a 7.8 earthquake just hit

i need help

what should i do im worried sick

2007-08-15 17:31:24 · 12 answers · asked by Jess 1 in Earth Sciences & Geology

2007-08-15 17:17:29 · 5 answers · asked by david f 1 in Zoology

2007-08-15 17:14:30 · 2 answers · asked by alamm 2 in Weather

2007-08-15 17:12:48 · 11 answers · asked by Anjee 1 in Astronomy & Space

Apparently it is a scale of some sort, but I'm not sure how to use it. Why wouldn’t a scale be linear anyway?

2007-08-15 17:08:21 · 2 answers · asked by Randy G 7 in Geography

Thanks.

2007-08-15 17:03:38 · 6 answers · asked by Anonymous in Paranormal Phenomena

We just need to give it a first push and it will just run forwever and ever. Could we just put a generator and a motor together and make them both run at the same time?
Any links?

2007-08-15 16:57:36 · 8 answers · asked by Anonymous in Engineering

2007-08-15 16:45:49 · 1 answers · asked by mrsjoshgroban 1 in Chemistry

please include source

2007-08-15 16:41:20 · 13 answers · asked by gimsf 2 in Weather

be a acting force to keep the absolute cold of space,there for there must be a end,or a start..............

2007-08-15 16:38:11 · 4 answers · asked by john doe 5 in Astronomy & Space

How can you determine if two lines are perpendicular?

2007-08-15 16:35:13 · 11 answers · asked by ? 2 in Mathematics

A)50dB
B)90dB

2007-08-15 16:30:38 · 2 answers · asked by Anonymous in Physics

A) 1.0W/m^2
B)10^-12W/m^2
C)normal conversation
D) the threshold of pain

2007-08-15 16:29:31 · 3 answers · asked by Anonymous in Physics

(3-4i)^2

2007-08-15 16:25:34 · 4 answers · asked by Anonymous in Mathematics

A box slides down an incline with uniform acceleration. it starts at 0m/s and reaches 2.7m/s in 3s.

Find the acceleration and the distance moved int he first 6s.

2007-08-15 16:23:37 · 3 answers · asked by Anonymous in Physics