Science & Mathematics - 1 November 2007

Why other country like USA,UK or Australia does not say anything to save them or help them

2007-11-01 08:24:03 · 9 answers · asked by jimmy 1 in Zoology

So the math problem is this
2/c+1 , - 1
_________
2 +, 5/c+1

So I times both side by the LCD (c+1) to get rid of the fractions

And I got this
2 - (c+1)
________
2(c+1) + 5

Am I doing it right so far ? and If I am , In the numerator am I supposed to multiply the - with (c+1

2007-11-01 08:22:33 · 2 answers · asked by kernal 3 in Mathematics

One formula looks simple enough to be re-typed here (the rest of them formulas are hopeless)
S = - Σ Pi lnPi

Can you tell me at least what this Σ thingie means?

2007-11-01 08:22:18 · 5 answers · asked by Alexander 6 in Mathematics

For example if you switched your house from incandescent to compact fluorescent lighting then your electric bill will obviously be decreased. However, because each bulb is no longer transferring 80% of its power to heat wouldn't your heating bill increase by approximately the same margin as you just decreased the electric?

Just something that has always bothered me and restrained me from using financial reasons for making the switch. Also I am aware that this is only a factor during the winter and in colder enviroments. Thoughts?

2007-11-01 08:22:08 · 6 answers · asked by faith_no_more26 2 in Engineering

2007-11-01 08:16:20 · 2 answers · asked by nikki 3 in Chemistry

2007-11-01 08:16:16 · 6 answers · asked by Anonymous in Weather

A function is to be maximized
f(x,y)= x+y subject to the constraint 2x^2+y^2=2

wha tis the exact value for the maximum

I can find all the derivatives and end up with 1=4*lambda*x
and 1=2*lambda*y

where do I go from here?

2007-11-01 08:15:03 · 2 answers · asked by cody s 2 in Mathematics

2007-11-01 08:10:59 · 4 answers · asked by blinky50 2 in Zoology

2007-11-01 08:07:19 · 4 answers · asked by RogerDodger 1 in Mathematics

is it mars, mercury, pluto or venus?

2007-11-01 08:07:13 · 4 answers · asked by powerpuffgirl_2332 4 in Earth Sciences & Geology

Hi i want to know the formula that looks through a list of data say this:


Name Score

Bob 65

Peter 32

Vic 87

Sally 99

James 100

Judy 34


And I want the formula to look down the list of scores and display the persons name with the highest score. In this case it would be james.

What is thre forumla. I know you can do it but i have forgotten.
Please could you include an Example

Thanks

Hearmenowinfo

2007-11-01 08:07:03 · 11 answers · asked by Anonymous in Mathematics

2007-11-01 08:05:44 · 8 answers · asked by Early Cuyler 2 in Geography

2007-11-01 08:03:29 · 20 answers · asked by Anonymous in Zoology

how do egg farmers know which eggs are eating eggs and which are baby chick eggs

2007-11-01 08:01:51 · 14 answers · asked by carnt spel 2 in Zoology

2007-11-01 08:00:47 · 1 answers · asked by Giggly Giraffe 7 in Mathematics

2007-11-01 07:58:45 · 3 answers · asked by V.S. 2 in Chemistry

chem enthalpy change?
Sadly, I have no idea how to do this problem. I have one more like it and an explanation in "idiots" terms would be great, but just an answer would be fine too...

PCl3(g) + 1/2O2(g) -----> Cl3PO(g) (delta)Hrxn= -286kJ

P4(s) + 6 Cl2(g) -----> 4PCl3(g) (delta)Hrxn=-1226kJ

(delta)Hf [P4O10(s)] = -2967kJ/mol

(delta)Hf[PCl5(g)]= -84kJ/mol

_________________________... Calculate the enthalpy change for the reaction: P4O10(s) + 6 PCl5(g) -----> 10 Cl3PO(g)


The numbers after the letters (eg, H2O2) are the subscripts...the numbers before (2 H...) are the regular numbers. Any help would be appreciated...

2007-11-01 07:55:09 · 2 answers · asked by Erika H 5 in Chemistry

the technique should be simple, inexpensive and we should be able to carry out the poling process in the laboratory .. and plz let me know the details of the process and all the parameters that control the process.... parameters like temperature, time etc ..........?

2007-11-01 07:49:58 · 1 answers · asked by chetan 1 in Engineering

First I'm a Creationist because as a believer in a Divine Creator I accept that the Old Testament (Written and Oral Torah) are completely true and the word of G-d in both its deeper hidden meanings (yet to be discovered) and it's known meanings (already discovered by humans). I'm Jewish and accept the tenants of my religion without reservation even though I don't practice all aspects of my religion such as eating non Kosher food. My husband who is currently being trained in Infantry with the US Army and is the bravest man in the world (MY OPINION!!) and soon to be a father of the cutest little boy in the world (lol lol) doesn't have an opinion on Evolutionary Theory. I'm currently taking Biology and College Algebra (precalculus class) at a Community College. As a future Scientist and Mathematician (I love Math!! almost as much as my husband!!) I see Evolutionary Theory as some sort of voodoo that doesn't work and doesn't seem to lead to any practical applications.

2007-11-01 07:49:54 · 10 answers · asked by Anonymous in Biology

1.calcium, copper, iron, and phosphorus.
2.calcium, copper, magnesium, and phosphorus.
3.calcium, copper, fluoride, and phosphorus.
4.calcium, chromium, magnesium, and phosphorus

2007-11-01 07:48:20 · 3 answers · asked by Fairy G 1 in Earth Sciences & Geology

2007-11-01 07:47:34 · 20 answers · asked by Anonymous in Chemistry

Okay, these questions are on something I have to turn in tommorow, so I'm pretty desperate for answers. If you help me answer these and explain the process (as thoroughly and on my level (11th grade) as possible) I'll choose your answer as the best.

After calculating the percent composition of silicon dioxide, answer these questions:

1. What mass of silicon dioxide would contain 25g oxygen?

2. How many moles of silicon dioxide would contain 25g oxygen?

3. How many molecules of silicon dioxide would contain 25 g of oxygen?


I'm concerned about getting the answers, but EVEN MORE concerned about understanding HOW to get the answers!

Thanks!

2007-11-01 07:46:58 · 4 answers · asked by Anonymous in Chemistry

1.
2 cars leave the same place at the same time, but drive in opposite directions along a straight road. 1 car averages 55mi/h and the other 65mi/h. in how many hours will they be 250 miles apart?
a. about 1.7 hours
b. about 2.1 hours
c. about 3.8 hours
d. about 4.5 hours

2.
helen rode her bike for 2 hours at a constant speed of 6km/h. she took the same route to come home but increased her speed by 6km/h. how far did she ride?
a. 36km
b. 24km
c. 18km
d. 4.5km

3. A helicopter leaves an airport and flies south 180mi/h. 30 minutes later, an airplane leaves the airport and follows the same route as the helicopter, only at a higher elevation. the airplane is flying 330mi/h. how many minutes will it take the airplane to catch up to the helicopter?
a. 12
b. 24
c. 40
d. 48

ps: this is not my homework but a review for a midterm coming up. if u could explain how u got the answers it be great. thanks

2007-11-01 07:45:45 · 8 answers · asked by Anonymous in Mathematics

2007-11-01 07:44:40 · 2 answers · asked by Anonymous in Chemistry

hydrogen bonds between adenine and thymine, or guanine and cytosine, from ______ ______ that join the two strands of the DNA double helix..........................ANSWER PLEASE!!

the supporting structure of the DNA double helix is called the sugar-phosphate_______...................ANSWER PLEASE!!

who identified DNA as the inheritance molecule?

what is a spooled string of genes packed in a single unit?

what is the smallest, membrane-bound protoplasmic body capable of independent reproduction?

PLEASE HELP! THIS IS DUE 2MORROW AT 8 AND I WOULD APPRECIATE UR HELP!!! =)

2007-11-01 07:44:07 · 2 answers · asked by TYL3R! 2 in Biology

the wind direction given is in number format. For instance,
Wind Direction: 300. There are no arrows or word description. My only info is a number. how do you interpret this number?

2007-11-01 07:40:37 · 8 answers · asked by YourChild 1 in Weather

2007-11-01 07:40:01 · 1 answers · asked by Julie W 1 in Chemistry

need details of how you came up with the answer. thank you

2007-11-01 07:38:07 · 8 answers · asked by Dixie 1 in Mathematics

im building a roof out of popsicle sticks for a project in geometry and i have to write a paper to show the accuracy of the roof. i need to know the reasoning for the angle of the roof

2007-11-01 07:36:50 · 15 answers · asked by ? 3 in Engineering

need details as to how you get the answer to this question.

2007-11-01 07:35:52 · 6 answers · asked by Dixie 1 in Mathematics