Science & Mathematics - 4 November 2007

When was mercury first discovered as a planet?

i know that it has been visible since pre historic times, but does anyone other than that, know when it was first found to be an actual planet not a star? and who by?


cheers!

2007-11-04 17:26:42 · 3 answers · asked by Anonymous in Astronomy & Space

Temples in Hindu Religion

2007-11-04 17:26:05 · 10 answers · asked by aashish2007 1 in Physics

As the developed countries face issues related to traffic, pollution due to increase in vehicles and fuel burnt by vehicles, the time they spend on roads. If moving roads are built using solar cells layered on them. One can just bring his own chair and sit on road and he can go to his destination. The roads will be energised by the solar cells which are attached to them to roll the road over. I think this implementation will do wonders. Give comments and implementation ideas. I want to build a model city with my ideas.

2007-11-04 17:24:12 · 3 answers · asked by Sooraj Kumar 2 in Engineering

I also need to know what number is representing each leg of the triangle. Is #x the smallest leg or #y, or vice versa. Here's the problem:

Consider an angle θ in standard position whose terminal side has the equation y = -5x, with x ≤ 0. Find the exact values of sin θ, cos θ, and tan θ.

I don't really need any explanations except for the leg part I noted above. All I need is to see the whole problem worked out and I'll get it. Our book is really vague, but I learn by seeing, so if you can help with the whole thing it'll be appreciated, and of course I'll reward you, serious people only please.

2007-11-04 17:21:17 · 3 answers · asked by Brick Top 1 in Mathematics

1. What relationship exist between the number of coils and magnetic field strength?
2. When you decrease the number of coils and magnetic field,what happen to the strength of wire?
3. When you increase the number of coils and magnetic field,what happen to the strength of wire?

2007-11-04 17:19:07 · 2 answers · asked by aning a 1 in Physics

Consider the function f(x)=X^3-2X^2-16X+16k, where k is an unknown constant. If 2 is a zero of f, find two other zeroes. Help please?!?! Im up 1 in the mornin tryin to do these stupid polynomial questions. Thank you.

2007-11-04 17:18:46 · 1 answers · asked by Nerro 2 in Mathematics

This problem stumped me, so I'm asking for help:

A rectangle is inscribed between the x-axis and the parabola (36-x^2) with one side along the x axis

find the maximum area of the rectangle and write a function of x for the area

2007-11-04 17:18:10 · 2 answers · asked by Anonymous in Mathematics

-2x + y + z = - 2
5x + 3y + 3z = 71
4x - 2y = 1

i know theres many type of way to solve it
but im still reallie confused if im doing it rite ><
any suggestions on making it easy?
or wut do u recomend that is easy way to solve it?

2007-11-04 17:16:58 · 2 answers · asked by Anonymous in Mathematics

As sound has energy in it. It has vibrations. If we keep some paper pieces in front of speakers they vibrate and move. So can we extract energy from sound like we generate power from solar power and from wind power.

2007-11-04 17:14:55 · 5 answers · asked by Sooraj Kumar 2 in Physics

As heavy weighed birds can also fly and we created aeroplanes can't a human being made to fly without any instruments making him genetically capable of flying by hybradising him with other flying creatures.

2007-11-04 17:08:27 · 9 answers · asked by Sooraj Kumar 2 in Zoology

a. None of the choices are correct.
b. understanding human evolution
c. All of the choices are correct
d. understanding human embryonic development.
e. improving the diagnosis, treatment, and prevention of heart disease, cancer, and other common ailments.

2007-11-04 17:07:43 · 5 answers · asked by None 1 in Biology

My grandpa was diagnosed with osteonecrosis about 6 months ago. Still nothing has shown on x-rays, MRI or bone scan. Right knee has horrific pain - can't walk - How long does it take for the bone to die & does it ALWAYS make new bone? Is there only ONE episode of pain or does it continue in pain FOREVER or until joint replaement?

2007-11-04 17:04:29 · 3 answers · asked by Anonymous in Medicine

2007-11-04 16:58:54 · 6 answers · asked by sikhsand 1 in Biology

I was watching on animal planet and they said something about that the turantula's venum isn't deadly. It's just like a bee-sting..

Is that true?

2007-11-04 16:58:38 · 6 answers · asked by Truth Seeker 1 in Botany

Jerry spent 2.5 h biking up Mount Lowe, rested at the top for 30 min., and biked down in 1.5 h. How far did he bike if his rate of ascent was 3km/h less than his rate of descent? (plz show ur work. I'm having trouble with this problem. Plz and thnx a lot!)

2007-11-04 16:54:00 · 3 answers · asked by Wendy F 1 in Mathematics

Thanks for answering! :)

2007-11-04 16:53:44 · 3 answers · asked by Pretty 'n' Pink! 1 in Mathematics

∫ [x^9 sqrt(x^5 - 3) ] dx

So this is what i did

∫ [x^9 sqrt(x^5 - 3) ] dx = ∫ [x^5 * x^4 * sqrt(x^5 - 3) ] dx

let u = x^5 then du = 5x^4 dx

∫ u sqrt(u - 3) du

Now what? stuck.... Do substition again?

2007-11-04 16:52:51 · 4 answers · asked by Anonymous in Mathematics

2007-11-04 16:52:15 · 10 answers · asked by Pretty 'n' Pink! 1 in Mathematics

2007-11-04 16:51:28 · 8 answers · asked by Pretty 'n' Pink! 1 in Mathematics

using the equations?

2007-11-04 16:50:30 · 1 answers · asked by hanye812 1 in Mathematics

Thanks for answering!

2007-11-04 16:50:29 · 5 answers · asked by Pretty 'n' Pink! 1 in Mathematics

2007-11-04 16:49:32 · 5 answers · asked by Anonymous in Mathematics

Factor by grouping: 5a^2 -5bc-5ab+5ac

2007-11-04 16:46:12 · 2 answers · asked by austin 1 in Mathematics

The Olympic flame at the 1992 Summer Olympics was lit by a flaming arrow. As the arrow moved d feet horizontally from the archer, assume that its height h, in feet, was approximated by the function
h = -0.002d2 + 0.7d + 6.6.
Find the relative maximum of the function.

2007-11-04 16:44:26 · 4 answers · asked by Anonymous in Mathematics

Long-term inorganic carbon cycle
Describe with a sketch or flow chart and a few sentences of explanation how the carbonate-silicate cycle works. For which of the following time intervals is the carbonate- silicate cycle important?

Past 3 billion years
Past 100 million years
Past million years
Past 20,000 years
Past 2,000 years
For each of the intervals that you mention, briefly describe how this cycle is believed to have influenced the temperature of the earth.

2007-11-04 16:43:43 · 2 answers · asked by Heather L 1 in Earth Sciences & Geology

touch the sphere. What arethe dimensions of the cube?

2007-11-04 16:42:04 · 2 answers · asked by glamour girl 1 in Mathematics

A rectangular book has several axes of symmetry, consider the two axes that split it in half and are perpendicular to its sides.

Throw it into the air giving it a rotating motion about one of the axes; repeat with the other axis. Do you notice a difference? Can you explain
it?

2007-11-04 16:39:38 · 1 answers · asked by JOE 2 in Mathematics

2007-11-04 16:39:20 · 4 answers · asked by davood s 1 in Mathematics

The neutral organic compound I am given is dissolved in 50mL of methelyene chloride and it is contaminated with 5% of an organic acid AND/OR 5% of an organic base. I have to separate the neutral compound from the base and or acid impurities and obtain a maximum yield of purified material.

Thanks in advance for the help.

2007-11-04 16:38:30 · 2 answers · asked by swizzbeatz905 1 in Chemistry

2007-11-04 16:36:36 · 13 answers · asked by Anonymous in Mathematics