Wednesday

January 18, 2017
Total # Posts: 690

**quantum mechanics**

Write the Hamiltonian operator for 2 electrons in a 1D box of length a. I know that the Hamitonian is a sum of the kinetic and potential energies. I was thinking that for 2 electrons in a 1D box it would be: -2((hbar^2)/2m_e)(d^2/dx^2)) + Coulomb interaction for 2 electrons I ...

*April 5, 2010*

**astronomy Confuse**

Time dilation is the theory of time relative to motion. It is the principle that time elapsed is relative to motion, such that time passes more slowly for a system in motion than for one at rest relative to an outside observer. Further, as predicted by Einstein's special ...

*March 28, 2010*

**Geology**

Im after info that will help me answer what the relevance of the age of the oceanic crusts and the continental crusts within the south american plate Are there presence of hotspots on the south american plate? what is the process that is responsible for the change in area of ...

*March 25, 2010*

**Science PHYSICS**

THANK YOU what is the magnitude of acceleration that the force 5.0 x 10³ N causes when applied to a vehicle with a mass of 1.1x10³kg??? How do i present the answer for this ?

*March 24, 2010*

**Science PHYSICS**

SO desperate with help with this. What is the magnitude of the acceleration that this force will cause when applied to a car with a mass of 1.1x10³Kg Then calculate the final speed of the car (above) assuming that it was standing still initially and that the force of 5.0 ...

*March 24, 2010*

**7th grade science**

what is the position of the diaphram when you make it inhale and exhale?

*March 15, 2010*

**Chemistry**

OK thank you so much! I was wondering whether or not there would be 2 OH ions to account for. Thanks again!

*March 14, 2010*

**Chemistry**

If 4.56 grams of NaOH and 56.3 grams of Ca(OH)2 are added to enough water to make 1.50 L of solution, what will the pH be?

*March 14, 2010*

**Chemistry**

I have some enthalpies of formation for a reactant and transition state but calculated using different computational methods. I want to find the ratio of the forward rate constants determined using both methods but I'm not really sure how. I thought I could maybe use ...

*March 13, 2010*

**Chemistry**

Iron metal is dissolved in dilute aqueous HCl. The resulting solution is warmed with dilute nitric acid and then treated with aqueous potassium iodide. Write equations for the reactions. Ok so for the first step I got: Fe + 2HCl --> FeCl2 + H2 I'm guessing that when ...

*March 2, 2010*

**Chemistry**

I'm trying to write an equation for the reaction of zinc nitrate with aqueous ammonia. I know that zinc hyroxide is produced first but I don't really know how to write an equation for this. This is what I came up with: Zn(NO3)2 + 2OH- --> Zn(OH)2 + 2NO3- I'm not...

*March 1, 2010*

**Paragraph**

elisabeth ur sentence is way better compared to mine, thanks B.F

*February 25, 2010*

**Paragraph**

Satisfy me by improving this and I'll be thankful to you 4ever. In the following paragraphs I will be talking about her life, where and who she performed with, which songs she sang, and what awards she won, and her charity work. It seems like Im missin something around in ...

*February 25, 2010*

**Maths (limits)**

for the first question, use ur GC (graphic calculator), u can see frm the table function that answer is 0.2 for the 2nd one, it is to say 2+lim(100/x)=2

*February 17, 2010*

**Maths**

1. list all the possible ages of the children (you don't need to, cos i've done it for you) - eg. (1, 1, 11) (1, 2, 10) etc 2. if you list all this, you will find that there are 2 answers that give a solution of 36. these are: (6, 6, 1) and (9, 2, 2) 3. the master says...

*February 3, 2010*

**Finance**

Bunyan Lumber, LLC, harvests timber and delivers logs to timber mills for sale. The company was founded 70 years ago by Pete Bunyan. The current CEO is Paula Bunyan, the granddaughter of the founder. The company is currently evaluating a 5,000 acre forest it owns in Oregon. ...

*January 30, 2010*

**6th grade math**

Thank you Ms. Sue

*January 26, 2010*

**6th grade math**

how do you find the reciprocal of 0.68?

*January 26, 2010*

**business**

Suppose I am a cashier working at McDonald's. What are their levels of management and organizational structure, managerial levels and positions?

*January 21, 2010*

**business**

What basic characteristics are needed for a shoe salesman to achieve a good person-job fit?

*January 17, 2010*

**business**

What basic characteristics are needed for a shoe salesman to achieve a good person-job fit?

*January 17, 2010*

**English**

I just took this test and answered 5 and got it wrong.

*January 13, 2010*

**Expression**

I have to introduce myself (character, life) in an original way and I haven't got a clue how to do this. I'm not a very creative person and time is ticking. It's stressing me out. Anyone got ideas ?

*January 13, 2010*

**6th Grade Math**

OK THANKS EVERYONE WHO HELPED MY SISTER SAYS THANKS TOO!!!!!<3

*January 12, 2010*

**6th Grade Math**

Ok i need to know what 2 3/6 + 3 1/2 is 4-2 3/5 and 2/3*4/5 is because i forget how to do adding subtracting and mutiplying fractions

*January 12, 2010*

**7th grade math**

suzanne earns s dollars per year.Francine earns f dollars per year.How much more money does Francine earn than suzanne?

*December 16, 2009*

**7th grade math**

add t and m. how much greater than w is the sum?

*December 16, 2009*

**7th grade math**

when p is subtracted from a certain number, the difference is 50. Find the number.

*December 16, 2009*

**7th grade math**

when s is added to another number, the sum is 26,493.what is the number?

*December 16, 2009*

**chemistry**

given 40.0g of iron, how many grams of iron II oxide are produced.

*December 15, 2009*

**7th grade science**

If an organism expresses a recessive phenotype can you tell the genotype? Explain, include one example in your response.

*December 15, 2009*

**7th grade science**

What is an example of genetic engineering helping people ?

*December 15, 2009*

**info**

What does Kamloops mean in native dialect?

*December 13, 2009*

**science**

compare inheritance by multiple alleles and polygenic inheritance

*December 10, 2009*

**Math**

Laurie expects to make $100,000 in 2007. Her social security tax rate is 6.20% up to the wage base, Medicare is 1.45%. How much FICA is Laurie expected to pay for the year?

*December 8, 2009*

**science**

compare and contrast mitosis and cell divison

*November 21, 2009*

**science**

how is Dna copied?

*November 21, 2009*

**7th grade science**

name two scientest who studied inherited genetics and what they used for research and why

*November 17, 2009*

**7th grade science**

name 2 scientest who inherited traits

*November 17, 2009*

**Chemistry (physical)**

At room temperature (25 degrees C) butane is a mixture of 72% anti and 28% gauche conformations. Calculate the difference in energy between the gauche and anti confromations. This is how I calculated it but I am not sure I am right: Boltzmann equation: N2/N1 = exp(-(E2-E1)/RT...

*November 8, 2009*

**Healthy Decision Making**

1.Wear a seatbelt in car 2.Don't play with fire 3.Wear a helmet when biking,etc. 4.Always have your shoelaces tied

*November 1, 2009*

**science**

Mitosis: Number of chromosomes in cells production Meiosis: Number of chromosomes in cells production.

*October 27, 2009*

**Quotes**

Awesome:-) these quotes are really good. I'd love to see more from others. please keep posting, thanks.

*October 17, 2009*

**Quotes**

I would like to know everyone's favorite quotes. My favorite quote is: This is a miracle that happens everytime to those who really love; the more they give,the more they possess. Out of all the quotes, I have to pick top 6, and then everyone in my class will vote for the ...

*October 17, 2009*

**philosophy**

what are your answers?

*October 17, 2009*

**english**

not illusory

*October 17, 2009*

**7th grade**

can you post those vocabulary words on here, maybe I can help.

*October 17, 2009*

**Riddles**

I would just like to know that say I need help on a riddle urgently, would i post it on Net Riddle to receive help?

*October 17, 2009*

**Twilight**

I have to do this writing assignment on anyone I want to. I really like Bella from the movie twilight so i am doing this on her. I have to describe her and all. I already know how she is from my point of view, but I would like to know how she is from yours. so please describe ...

*October 12, 2009*

**Twilight**

thanks, more ratings will be appreciated from others

*October 12, 2009*

**Twilight**

I would like to know everyone's opinion on Twilight. rate from 0 to 5. We are supposed to pick one topic, it can be on anything, so I chose twilight. I just need the average rating,thanks.

*October 12, 2009*

**math**

Kevin makes $5.25 per hour he worked 18.25 hours. What is the best estimate of the amount of money he made? Do you just divide the 2 numbers?

*October 12, 2009*

**Math**

Faryi averaged 50 mph on trip to visit an amusement park 80 miles away and started with a full tank of gas. Her car usually averaged 25 mph each time she purchased. The gas price $2.65 par gallon when she got home. Calculate Faryi’s time ( in minutes) and the cost to fill...

*October 11, 2009*

**math**

In the year 1910, many people immigrated to the United States-460,935 from northern and Western Europe, 465,356 from eastern and southern Europe, 89,534 from the Americas, 23,533 from Asia, and 1,072 from Africa. Make a bar graph to show this data. What would be an easy ...

*September 7, 2009*

**math**

how?

*September 3, 2009*

**math**

can someone please explain this problem? (-> is an arrow) assume that limit x-> 4 f(x)=0 and limit x-> 4 g(x)=3 1. limit x-> 4 (g(x)+3

*September 3, 2009*

**math**

how do i find the limit of this? (This symbol:-> is an arrow) lim of x-> 0 sin^2x/x can someone please explain?

*September 2, 2009*

**science**

How can island biogeography be compared to the design of nature reserves? I understandall the things you can do to the nature reserve in terms of bettering it but how is an island similar to a wildlife refugee or reserve (why can you compare them)? can someone please explain?

*September 2, 2009*

**psychology**

do you agree that humans are creatures as well as creators of their personal and social world

*September 2, 2009*

**Algebra**

If f(x)=x^2-2 and g(x)=1/(3x) (x does not equal 0), find g(f(-1)

*July 27, 2009*

**english**

is this a metaphor? Our shadow painted the sand

*June 14, 2009*

**Chemistry**

Which would react faster with MeI in aqueous solution: OH- or Et3N? I know that the reaction in aqueous solution would be an Sn1 reaction and so steric hindrance wouldn't have such a great effect. I am not sure which is a better nucleophile out of OH- and Et3N. OH- is ...

*May 26, 2009*

**Math**

A set of homogeneous simultaneous equations is given by x + ky = 0 kx + 3y = 0 Calculate the two values of k that lead to non-trivial solutions to these equations and express y in terms of x for the two values. I thought that for the solutions to be no trivial the determinant ...

*May 17, 2009*

**Chemistry**

I am attempting to answer a question which asks to explain the sequence of pKaH values for a series of substituted guanidines (NH2)2CNR where R varies. The order is R = H , Ph , CH3CO , MeO , CN , NO2 pKaH = 14.5 , 10.8 , 8.3 , 7.5 , -0.4 , -0.9 I'm not quite sure how to ...

*May 4, 2009*

**Maths**

How can it be possible for a set of inhomogeneous simultaneous equations to have no unique solution?

*April 28, 2009*

**Chemistry**

Why do amides require much harsher conditions for hydrolysis than esters? I'm guessing amides are more stable for some reason, but I'm not completely sure. Is it conjugation?

*April 23, 2009*

**Chemistry**

Why does CdCO3 have a significantly lower decomposition temperature than CaCO3, despite the similarity in the ionic radii of Ca2+ and Cd2+? I think they both decompose to give the metal oxide and carbon dioxide. Could the polarising ability of Ca compared with Cd have ...

*April 23, 2009*

**math**

c 16

*April 22, 2009*

**math**

louis drew all of the possible diagonals from one vertex of a regular hexagon. Which of these statements is true? A) Each diagonal from this vertex is one of two different lengths B) None of the diagonals forms a line of symmetry of the hexagon. C) The diagonals form four ...

*April 22, 2009*

**History- Opinion**

Yes! Totally. It's sounds very good. Who said that? I've it before.

*April 22, 2009*

**math**

Are diagonals longer shorter or the same size as a regular pentagon's sides?

*April 21, 2009*

**circuits**

a parallel RLC bandpass circuit with C=10nF and Q=10 has a center frequency of 500 krad/s. Find R,L and the two cutoff frequencies. Can you design this circuit using a cascade connection of two first-order filters separated by a follower?

*April 20, 2009*

**circuits**

For the transfer function Tv(s)=[10(s+5)(s+20)]/[(s+1)(s+100)] is this a low-pass, high-pass, bandpass or bandstop function? estimate the corner frequency(ies) estimate the passband gain what is the output if v1(t)=10cos(1000t+45deg) V??

*April 20, 2009*

**Chemistry**

Which is the stronger base, NH3 or H2N-CH2COOH?

*April 18, 2009*

**Chemistry**

Why is the carbonyl group in tert-butoxycarbonyl group (tBOC) less susceptible to attack from nucleophiles than the carbonyl group in esters such as ethyl acetate? Is this something to do with conjugation?

*April 13, 2009*

**maths**

what is th area of 10,10,18,4,4,8,8,2 ?

*April 8, 2009*

**Chemistry**

Is this the correct equation for the formation of [Co(NH3)5(ONO)]^2+ from [Co(NH3)5Cl]^2+ ... [Co(NH3)5Cl]^2+ + NO2 --> [Co(NH3)5(ONO)]^2+ + Cl- I'm a bit unsure because the charges don't balance

*April 8, 2009*

**science**

if two bumper cars collide and they both stop, how do you know a force has acted on them?

*April 4, 2009*

**Literature:)**

37.4% of marriages end up in divorce. these are mostly young people, about 20's.

*April 4, 2009*

**Nutrition of the young child**

B, i think

*April 4, 2009*

**Economics**

705 3987.5

*April 3, 2009*

**Literature (If considered that)**

Ms. Sue is right. 37.4% of marriages end up in divorce.

*April 2, 2009*

**literacy**

The first word and all the other words after it besides the, on, and, and other commonly used words. For example: "The City Charlotte is on the Map!"

*March 31, 2009*

**social studies**

In the year 1900 how many colleges were there?

*March 31, 2009*

**math**

a box holds 23 puzzles. How many boxes are needed to hold 238 puzzles?

*March 31, 2009*

**math**

You are having a pool party and invite 2 of your best friends. These two friends each invite two other people. Each of these 2 people invite 2 people that haven't been invited. How many people will be invited if this process continues for four rounds?

*March 31, 2009*

**math**

20.5092

*March 31, 2009*

**math**

A jacket Jason wants to buy is priced at $18.99. The sales tax is 8%. What is the total cost of the jacket, including tax?

*March 31, 2009*

**circuits**

the zero input response of a series RLC circuit with R=80 ohms is V(c)=2e^(-2000t)cos(1000t)-4e^(-2000t)sin(1000t) V for t>0 if the initial conditions remain the same, what is the zero-input response when R=40 ohms

*March 23, 2009*

**circuits**

in a parallel RLC circuit you have L=100mH and i= inductor current i=50e^(-4000t)-10e^(-5000t) mA how do you find R and C??

*March 23, 2009*

**math**

how do you find the coordinates of the point (x, y, z) on the plane z = 1 x + 1 y + 2 which is closest to the origin

*March 16, 2009*

**math**

Find the maximum and minimum values of f(x,y)=xy on the ellipse 8x^2+y^2=4?????

*March 16, 2009*

**math**

Find three positive real numbers whose sum is 52 and whose product is a maximum?????

*March 16, 2009*

**6th grade Science**

What relationship exists between high tides and phases of the moon?

*March 16, 2009*

**Chemistry**

Write balanced equations for the formation of [Ni(NH3)6][BF4]2 starting from an anhydrous sample of nickel(II) choride hexahydrate. (3 equations necessary) I am slightly confused by this. I think the starting sample has the formula [Ni(H20)6]Cl2 Would this react with ammonia...

*March 11, 2009*

**Chemistry**

I think that nickel(II) nitrate has the formula Ni(NO3)2. As we are starting from anhyrdrous nickel nitrate I thought the first step might be to hydrate it Ni(NO3)2 + 6H2O --> [Ni(H2O)6](NO3)2 and then I thought a reaction with potassium thiocyanate KSCN but I am not sure ...

*March 11, 2009*

**Chemistry**

Write balanced equations for the formation of K4[Ni(NCS)6] starting from an anhydrous sample of nickel(II) nitrate. (3 equations necessary)

*March 11, 2009*

**Chemistry**

What is a balanced equation for the formation of [Co(NH3)5Cl]2+ from [Co(NH3)5(OH2)]3+ ?

*March 4, 2009*

**Math**

Which 3 x 3 matrix represents a reflection in the yz plane followed by inversion through the origin?

*February 24, 2009*