Science & Mathematics - 25 November 2007

The percentage of cytosine bases in the molecule is?
please show me how you work this out. I am struggling in these type of question.

2007-11-25 04:11:27 · 3 answers · asked by Anonymous in Biology

In science fiction films they use a laser beam coming from a laser gun as a special effect. Why would we not see a beam coming from the laser gun?

2007-11-25 04:10:39 · 4 answers · asked by Anonymous in Physics

{1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 91 ...}

How can I go about to prove that there exists or there doesn't exist a perfect square and perfect cube in the series. If there exists these numbers, how can i possibly find the smallest one?

2007-11-25 04:03:45 · 5 answers · asked by Man 5 in Mathematics

2007-11-25 04:02:34 · 9 answers · asked by blue_eyed_woman_23 3 in Mathematics

I know cot = 1/tan, but the rest just boggle me unless I have a cheatsheet in front of me. :(

What do you use to remember them?
Another form of SOHCAHTOA?

2007-11-25 03:59:08 · 8 answers · asked by A 1 in Mathematics

What is it called? what kind of job would it be to find life in space?

2007-11-25 03:53:59 · 6 answers · asked by Anonymous in Astronomy & Space

Find (dy/dx) for the equation (x^3)-2(x^2)(y)+3x(y^2)=38

2007-11-25 03:49:51 · 5 answers · asked by Oscar A 2 in Mathematics

What happens if we built a a road that went all around the world with nothing holding it up, the gravity would surley pull it down, but tht would mean the other side of the worlds road, would go in the air, but then gravity would pull it, so what happens? does it float?

2007-11-25 03:48:08 · 3 answers · asked by Anonymous in Physics

Given that:

If I buy a shirt, then I will buy a vest.
If I do not have any money, then I will not buy a vest.
Either I buy a shirt or I will not go to the dance.
I am going to the dance.
Do I have any money?

1. yes
2. no
3. cannot tell
--
and

Given the statement: "If two sides of a triangle are congruent, then the angles opposite these sides are congruent."
Given the converse of the statement: "If two angles of a triangle are congruent, then the sides opposite these angles are congruent."
What is true about this statement and its converse?

1. Both the statement and its converse are true.
2. Neither the statement nor its converse is true.
3. The statement is true but its converse is false.
4. The statement is false but its converse is true.

2007-11-25 03:45:48 · 5 answers · asked by Emilyy 4 in Mathematics

I have always wondered that

2007-11-25 03:44:10 · 17 answers · asked by ~Decode ♥ Me~ 3 in Earth Sciences & Geology

2007-11-25 03:38:08 · 4 answers · asked by Mo 2 in Physics

2007-11-25 03:37:14 · 11 answers · asked by Anonymous in Other - Science

The normal force ( directed downwards ) provided by the track at the top of the loop is equal to one-half the weight of the car.
What is the speed of the coaster at this point ?

2007-11-25 03:33:34 · 4 answers · asked by Anonymous in Physics

2007-11-25 03:30:39 · 7 answers · asked by chinese_helicopter 2 in Engineering

In a circus act, a 60 kg trapeze artist starts from rest with the 5 m trapeze rope horizontal. What is the tension in the rope when it is vertical?

Please help! I have tried a bunch of things but I can't get the right answer!

2007-11-25 03:25:21 · 7 answers · asked by Anonymous in Physics

I have been given this weekend physics task of finding out what happens at certain temperatures (We are in the topic of matter and e=kt and all that stuff...) The book I have gives examples such as:

At 6 million K, ionisation of inner electrons of atoms...

Apparently, according to my physics teacher, thats boring...

Anyone have any ideas of any interesting temperature stuff?

2007-11-25 03:24:38 · 4 answers · asked by Sean 3 in Physics

Which molecule or compound below contains a pure covalent bond?

A) SCl6
B) PF3
C) Cl2
D) Li2CO3
E) NaCl

2007-11-25 03:17:44 · 2 answers · asked by Anonymous in Chemistry

Show that if G is a finite group with identity e and with an even numebr of elements, then there is a ≠ e in g such that a* a = e.

2007-11-25 03:16:30 · 1 answers · asked by Charm 1 in Mathematics

reagents and conditions aswell please

2007-11-25 03:08:25 · 3 answers · asked by LiNnY 3 in Chemistry

Subtract c + 4 from 3c – 6

2007-11-25 02:58:57 · 5 answers · asked by Anonymous in Mathematics

2007-11-25 02:57:58 · 6 answers · asked by chinese_helicopter 2 in Engineering

Need to find v.w describe answer in practical term.

2007-11-25 02:57:19 · 4 answers · asked by danahen2000 1 in Physics

Solve by factoring

x^2-5x-14=0

2007-11-25 02:56:36 · 7 answers · asked by meme 1 in Mathematics

It's about glasses for color deficients. This kind of glasses change the spectrum of light which is passing through it. I want to know if the same think happens to the prism http://en.wikipedia.org/wiki/Image:Prisma.gif Pleeeease heeelp, i need this for a project.

Thank you.

2007-11-25 02:50:41 · 1 answers · asked by Gabriela I 1 in Physics

2007-11-25 02:49:52 · 26 answers · asked by Anonymous in Mathematics

2007-11-25 02:48:11 · 8 answers · asked by enquirerV 1 in Medicine

newtons craddle consists usually of 5 small steel spheres,each suspended by 2 light strings. modelling this by a number of particles each suspended by 2 strings inclinded at 80 degrees to the horizontal, find the tension in each string when:a) the weight of each steel sphere is 0.8 newtons b) the mass of each steel sphere is 0.1kg.

2007-11-25 02:39:59 · 1 answers · asked by Anonymous in Physics

2007-11-25 02:35:37 · 7 answers · asked by Anonymous in Weather

A 51.0 kg diver steps off a diving board and drops straight down into the water. The net force when in the water is an upward 1020 N. If the diver comes to rest 5.0 m below the water's surface, what is the total distance between the diving board and the diver's stopping point underwater?

2007-11-25 02:33:34 · 3 answers · asked by Anonymous in Physics

do you think they will survive global warming and humans?

2007-11-25 02:29:35 · 10 answers · asked by fozz 4 in Zoology