Science & Mathematics - 19 January 2007

2007-01-19 17:49:49 · 10 answers · asked by Paulo Star 1 in Earth Sciences & Geology

Simplify: (please do step by step)

1) ( ------ is division bar)

sinx 1 + cosx
---------- + -------------
1 + cosx sinx


2)

cosxsin^2 - cosx
-------------------------
cosxcotx

2007-01-19 17:47:33 · 3 answers · asked by Icy 2 in Mathematics

Let a=b.
Then a^2=ab
a^2 - b^2 = ab - b
(a+b)(a-b)=b(a-b)
a+b=b
Since a=b
then 2b=b
2=1 ???
Where's the mistake???

2007-01-19 17:47:09 · 10 answers · asked by Master Chief 2 in Mathematics

humans learn from the behavior of others... but animals often dont have that luxury - i'm having a hard time believing that its written in their dna. thoughts? knowing danger, or when/how to have sex, or to know to build nests, to know to bring food to the queen been/ant.. when they dont have examples they seem to know what to do anyway...... HOW?! :P

2007-01-19 17:41:47 · 10 answers · asked by honorablepassion 2 in Zoology

2007-01-19 17:37:42 · 6 answers · asked by lajjo 1 in Mathematics

How would a blue diamond cost if it is 1/5 CT?

2007-01-19 17:37:34 · 4 answers · asked by gowrifleman 2 in Earth Sciences & Geology

Fact - a coke can's wall is 0.004" (0.1mm) thick

How would you be able to machine the coke can's wall so that the thickness is equal to 0.002" (0.05mm) thick?

Remember that the rpm can affect the way the can behaves in the lathe. It might expand due to centrifugal forces.

Remember this coke can has no dings, dints and not warped. The can maybe empty or full, you decide. In other words its a perfectly perfect coke can. (or pepsi or any drinking can).

2007-01-19 17:35:16 · 1 answers · asked by Anonymous in Engineering

When the sky is completely overcast in the winter and it is NOT raining are the clouds cirrus? thanks

2007-01-19 17:32:34 · 1 answers · asked by A1973 3 in Weather

avg = average
temp = temperature

2007-01-19 17:29:04 · 4 answers · asked by paulinatran10 1 in Chemistry

Do you think it is important to know more about the ageing process in sperm?

2007-01-19 17:28:48 · 1 answers · asked by Alex 2 in Biology

2007-01-19 17:24:51 · 3 answers · asked by leos_mama 3 in Biology

like seriously! I don't get it! Some smart physicist guy help plz! ;)

2007-01-19 17:22:30 · 9 answers · asked by ? 3 in Weather

2007-01-19 17:22:18 · 5 answers · asked by eliza_andrea15 1 in Chemistry

2007-01-19 17:20:45 · 16 answers · asked by bbnnrr 1 in Geography

2007-01-19 17:19:57 · 4 answers · asked by Anonymous in Chemistry

2007-01-19 17:19:16 · 21 answers · asked by priya 2 in Biology

A 4.00 x 10^2-g glass coffee cup is at room temperature, 20.0ºC. It is then plunged into hot dishwater, 80.0ºC. If the temperature of the cup reaches that of the dishwater, how much heat does the cup absorb? Assume the mass of the dishwater is large enough so its temperature doesn't change appreciably.

2007-01-19 17:19:15 · 3 answers · asked by smiyololo 1 in Physics

For example, a
4-sided square has 1
5-sided pentagon has 5
6-sided hexagon has 13
etc.

2007-01-19 17:13:36 · 4 answers · asked by Scythian1950 7 in Mathematics

In Darwin's time there was a relative lack of evidence supporting his theory, but he still found a considerable amount in fields like biogeography, embryology, and paleontology. Now, advances in science have added new evidence in those fields, as well genetics, microbiology, immunology, and a host of others.

Evolutionary principles have lead to better treatments for diseases such as leukemia and AIDS, and speciation has been witnessed in scientific experiments involving short-generation species such as fruit flies. Also, fossils of "transitional species" such as tiktaalik continue to emerge as predicted.

Thus far, opponents to evolution have focused vainly on undermining the research without providing a reasonable alternative.

So why is it that 51% of Americans don't accept evolution? If we're really still in such a Dark Age-mentality, why don't we also still believe that the world is flat, that the sun revolves around it, and that literate women should be burned at the stake?

2007-01-19 17:08:47 · 12 answers · asked by na n 3 in Biology

remain in that position unless the driver stop putting breaks??

2007-01-19 17:03:38 · 11 answers · asked by Anonymous in Physics

The recent Change in the Doomsday Clock its put 2 Minutes ahead after Year 2002 and the difference is of 5 Minutes to the Midnight.

Scientist have put worry on Global Warming and Nuclear Race for this, but as the World is heating up and the nuclear race is not ending how far are we from the end?

2007-01-19 17:02:49 · 6 answers · asked by Ajay B 1 in Earth Sciences & Geology

Divide x3 − 4x2 + 120 by x + 4

2007-01-19 17:02:10 · 4 answers · asked by Antonello D 1 in Mathematics

A basketball player, about to "dunk"the ball,jumps 76cm vertically. HOw much time does the player spend (a) in the top 15cm of this jump and (b) in the bottom 15cm? Does this help explain why such players seem to hang in the air at the tops of their jumps?

2007-01-19 16:59:56 · 3 answers · asked by Anonymous in Physics

2007-01-19 16:59:19 · 5 answers · asked by joad 1 in Mathematics

2007-01-19 16:55:45 · 2 answers · asked by hs415zps 1 in Mathematics

It sounds bizarre, to say the least, but I read long time ago about something like it, any one else have?

2007-01-19 16:55:40 · 13 answers · asked by carpetbagger 4 in Astronomy & Space

Culd u plz send me a pic of each. i need actual picture not sumethin from google images

2007-01-19 16:55:17 · 1 answers · asked by Anonymous in Engineering

Hello ppl..m a student of STD XII n gotto make a chemistry project for my assignment but i couldn't hit on some good topic...so wil u al plz suggest me a good and interesting topic for the project like drugs,antacids or sumthin' good...please......

2007-01-19 16:52:59 · 3 answers · asked by sweet_teen553 1 in Chemistry

what are the neccessary steps to solve this problem?

2007-01-19 16:49:10 · 9 answers · asked by carlos 2 in Mathematics

i'm having difficulties when it comes to divide something on math.so if anyone know a website that can help me to learn step by step ,can you please tell me? any good textbook or something

2007-01-19 16:48:40 · 3 answers · asked by ocean86 3 in Mathematics