Science & Mathematics - 3 December 2006

2. explain the factors affecting rate of "chemical" reaction.

2006-12-03 14:02:32 · 3 answers · asked by Aditya N 2 in Chemistry

This is the problem:
I am the car salesperson.
My probability of selling a car is 1/10
n is the number of time I try to sell the car.
i.e. If I have to talk to 3 persons to sell a car n=3 (fail the first 2 attempts and succeed on the 3rd attempt)
p(3) should be (9/10)^2(1/10)
Find E(n) and Var(n).

Thank you.

2006-12-03 14:01:52 · 3 answers · asked by Vu 2 in Mathematics

A) DNA packing and unpacking
B) the binding and unbinding of transcription factors to silencer sequences.
C) The binding and unbinding of transcription factors to enhancer sequences.
D) RNA splicing.
E) Attachment of RNA polymerase to the promoter

2006-12-03 14:01:35 · 3 answers · asked by Anonymous in Biology

2006-12-03 14:01:21 · 2 answers · asked by stacy G 1 in Chemistry

The effective coefficient of friction is 0.25

Any help appreciated... ASAP please.

2006-12-03 14:00:54 · 1 answers · asked by abc123 1 in Physics

If i have an atom that has 8 protons and 8 neutrons, how many electrons do I have?

2006-12-03 14:00:19 · 6 answers · asked by blynn 1 in Chemistry

Choices are:skeletal or muscular.

2006-12-03 13:59:54 · 4 answers · asked by Anonymous in Biology

2006-12-03 13:59:04 · 5 answers · asked by moneym 1 in Engineering

How did the ingredients of a buffer solution assisted in the extraction of DNA?The experiments purrpose was to extract DNA from a banana. The banana was squished until it was all mushy. Then it was mixed with a buffer solution that contained shampoo,baking soda,salt,and distilled water. I know the shampoo dissolves the lipids and proteins of the cell. During this process the cell membrane is being broken down and the bonds that hold the cell membrane together are filtered out. The baking soda in the buffer solution regulated the pH level of the substance.But can you please help me with the other 2-salt and distilled water. Thanks in advance=)

2006-12-03 13:58:49 · 2 answers · asked by SweetLatina 2 in Biology

2006-12-03 13:58:14 · 3 answers · asked by umangu 3 in Botany

is it socially acceptable for you to worry? I'm not worrying, I'm just asking.

2006-12-03 13:58:09 · 18 answers · asked by Jim 2 in Astronomy & Space

1. m"2+2m-8=0
2. y"2-y-6=0
3. x"2-25=0

2006-12-03 13:57:49 · 3 answers · asked by guyana_bhai_2003 1 in Mathematics

2006-12-03 13:57:06 · 5 answers · asked by Addicted To Abercrombie & Fitch 2 in Mathematics

2006-12-03 13:55:25 · 4 answers · asked by Anonymous in Astronomy & Space

A) enhancers
B) silencers
C) Operators
D) Operons
E) regulators

2006-12-03 13:54:29 · 1 answers · asked by Anonymous in Botany

..........π
f(x)=∫(1+cost)dt , f'(x)= ?
..........x

What I am trying to find is the derivative of the integral of (1+cost) from π to x.

2006-12-03 13:53:11 · 3 answers · asked by wafflehouse 4 in Mathematics

A 98 newton sack of grain is hoisted to a storage room 50 meters above the ground floor of a grain elevator.

What is the icrease in potential energy of the sack of grain at this height?

The rope being used to lift the sack of grain breaks just as the sack reaches the storage room. What kinetic energy does the sack have just before it strikes the ground floor?

2006-12-03 13:50:43 · 3 answers · asked by josh h 3 in Physics

2006-12-03 13:50:13 · 7 answers · asked by Aditya N 2 in Chemistry

Can you please check over thiss for me...Thank youuu...
Note: Elodea is a fresh water plant.

a) Elodea cells normally contain 1% salt and 99% water.
b) Tap water contains 1% salt and 99% water.
c) Salt water contains 6% salt and 94% water.
d) Salt water has a higher concentration of salt than fresh water or Elodea cells.

Answer the following questions using the information above about the cell in salt water:

1) What is the percentage of water outside the cell at the start?- 94
2) What is the percentage of water inside the cell at the start? -99
3) How do the percentages compare? - the percentage of water inside the cell is higher than that of outside the cell
4) When will water move across the cells membrane? -during osmosis?
5) WOuld the cell shape change once it was placed in the tap water? -yes because the cell was trying to equal the concentration of water and salt inside and outside of it...

is all of this correct? if not, can you please correct my answers?!

2006-12-03 13:48:57 · 1 answers · asked by Lina 4 in Botany

2006-12-03 13:46:58 · 5 answers · asked by mollie g 1 in Physics

..........π
f(x)=∫(1+cost)dt , f'(x)= ?
..........x

2006-12-03 13:46:38 · 6 answers · asked by wafflehouse 4 in Mathematics

she my problem is this. im understsanding like Na + Cl is NaCl
but what about these like this...
Cu+1 + Cl
Sn+4 + Cl
Cr+7 + Se

please expalin
thx!!

2006-12-03 13:46:20 · 2 answers · asked by Anonymous in Chemistry

lets say you get one of those things where you have the sperm and egg put together and then put back inside the woman but you have male cat DNA mixed with it would the egg die? would it be born with cat like features? or would it just have cat like genes like being able to see in the dark or jump high if the zygote lived?

2006-12-03 13:46:01 · 9 answers · asked by Peace ☮ 2 in Biology

2006-12-03 13:45:33 · 5 answers · asked by josu 1 in Zoology

Choices are: skeletal or cardiac.

2006-12-03 13:43:01 · 3 answers · asked by Anonymous in Biology

I'm going to be building a 12.5" Dobsonian telescope. For the primary mirror, precision optics, of F5 or better and certified, are roughly $1600. Yet many websites sell Chinese imported mirrors, at prices between $500 and $800. Will the quality of the primary make a huge amount of difference in the finished product, or would investing in a better eyepiece yield the same results?

2006-12-03 13:42:26 · 4 answers · asked by mvsopen 3 in Astronomy & Space

You are given three different compounds and must use your knowledge of INTERmolecular forces to determine the order that each compound will BOIL. You are given:
·Ammonia
·Octane
·(Liquid) Nitrogen (N2)
#1: Identify which liquid will boil first, second, etc.
why is it in that order?

2006-12-03 13:42:03 · 3 answers · asked by Anonymous in Chemistry

Simplify the expression.

square root12b - square root48b + 5 Square root3b

2006-12-03 13:41:11 · 6 answers · asked by Anonymous in Mathematics

I heard they store it in concrete casks in the ground surrounded with lead, is that true?

2006-12-03 13:40:59 · 8 answers · asked by Be Still and know He's God 5 in Physics

2006-12-03 13:40:42 · 5 answers · asked by Anonymous in Biology