Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 1,729

**For DrBob222**

thank you so much for your help, i know it wasnt that difficult, i think i just confused myself with the temperatures. i get the answer now.

**For DrBob222**

i had to convert 38.3 to kelvin... because i converted the initial T to kelvin.

**For DrBob222**

the chemistry question: v=0.465L T=559.15K P=112.496 kPa Pv/t = Pv/t 112.kpa(0.465)/559.15 = (x)(0.464428)/(247.8) x= 49.9 kPa ...i skipped conversion steps, but i'm pretty sure i did those right..

**Chemistry**

A sample of Kr gas has a volume of 465 mL at 286°C and 844 torr. When the gas is cooled by 38.3°C, its volume is reduced by 0.572 mL. What is the final pressure of the gas in kPa? the answer is supposed to be 105 but i keep getting 49.9!!!!!!

**CHEMISTRY**

A 8.90-g sample of ethane, C2H6, is mixed with 18.8 atm of O2 (an excess) in a 1.50 L combustion chamber at 130.0°C. The combustion reaction to CO2 and H2O is initiated and the vessel is cooled back to 130.0°C. What is the final pressure in the combustion chamber assum...

**science**

what is a mineral

**Chem Midterm Review**

Ok, so I've been really busy with midterms and my chemistry one is tomorrow. Now, I never intended to let so much time slip by before i started studying, but it happened. It's one of my most important exams. Do I still have a chance of passing? If so, how should I atte...

**math**

a. y= 4x b. y= 2x c. y= 1 half x

**math**

identify the value of m in each equation. Then match each equation with it's graph.

**Calculus**

how did you get ry and r^2y for y' and y''?

**Calculus**

I posted this several days ago but it hasn't been answered and I still can't figure it out: For which values of r does the function defined by y=e^(rt) satisfy the differential equation y''+ y'-6y = 0

**Calculus**

For which values of r does the function defined by y=e^(rt) satisfy the differential equation y''+ y'-6y = 0

**Chemistry**

Yeah, I know that, but why can Copper lose either one or two while cadmium only has a +2 OS. I think the answer has something to do with valence electrons, but I'm not sure exactly.

**Chemistry**

Why can Copper have both a +1 and +2 oxidation state?

**Ap Chemistry**

In a class discussion, my teacher told me that 74.06% of the volume of each unit cell is occupied by atoms (in the cubic closest structure). Where does this percentage come from? How can I find it?

**Angles...**

How do i express angles in a radian measure as multiples of pi. For example, suppose i have an angle of 30 degrees, and a angle of -270 degrees. How would I express them in a radian measure as a multiple of pi?. Thanks.

**Chemistry**

Thank you

**Chemistry**

or CH2 double bond C(CH3)CH(CH3)CH3

**Chemistry**

would 1. be CH3C(CH3) Double bond C(CH3)CH3

**Chemistry**

Hey Everyone I was wondering how I could write the condensed structural formula for the following organic chemicals: 1. 2,3-dimethyl-2-butene 2. 4-ethyl-2-hexyne 3. 3,3,6-trimethylnonane 4. 3-ethyl-4-prophylheptane 5. 3-octanol 6. 2-methyl-2-pentene 7. 5-methyl-1-hexene 8. 2,2...

**Math**

List the first eight prime numbers.

**Writing**

I am looking for some written a one act play. Write anc act out a one act play in front of class covering a specific workplace issue , exapmple my include sexual harassment, workplace stress, great/bad bosses etc.

**physics**

The radiation curve of the sun shows that the brightest light fro the sun is yellow- green. Why, then, do we see the Sun as whitish instead of yellow green?

**physics**

then it has to be reading glasses.

**physics**

Suppose that sunlight falls both on a pair of reading glasses and on a pair of dark sunglasses. Which pair of glasses would you expect to become warmer?

**Chemistry**

Barium's Oxidation State is +2, Nitrate's Oxidation state is -1 Does that help?

**Physics**

What two ways can waves interact? ^I have no clue what its asking

**Is this how you derive the formula for arc length?**

in the third step, how did you integrate the right side with no delta-variable?

**chem**

A 1.00 L flask containing 450 torr of H2 is connected to and mixed with a second flask with a volume of 0.500 L containing 250 torr N2. What is the final pressure of the resulting mixed gas system? a) 250 torr b)383 torr c) 450 torr d) 575 torr e) it cannot be determined

**chem**

A 1.00 L flask containing 450 torr of H2 is connected to and mixed with a second flask with a volume of 0.500 L containing 250 torr N2. What is the final pressure of the resulting mixed gas system? a) 250 torr b)383 torr c) 450 torr d) 575 torr e) it cannot be determined

**chem**

Suppose that Quebec had managed to succeed from Canada and became an independent country. Just to be difficult, they decreed that they will only measure pressure in mm Hg and volume in cm3. What value for R, the ideal gas constant, would students in Quebec use when solving the...

**Math**

Prove that a simple graph with n >_ 2 vertices must have atleast two vertices with the same degree. There was a hint given in the book saying that the key to this is the graph can not have both a vertex of 0 degree and a vertex of n-1 degree

**Math**

It means that it is attached to that many other vertexes, say if a vertex is attached to two other vertex by lines then it has degree 2

**Math**

Prove that a simple graph with n >_ 2 vertices must have atleast two vertices with the same degree. There was a hint given in the book saying that the key to this is the graph can not have both a vertex of 0 degree and a vertex of n-1 degree Thanks

**Math**

Use iteration to guess an explicit formula for the sequence. Pk=Pk-1+2*3^k P1=2

**Business**

Can you help me to understand what is the role of power in the control process? I am not even really sure I understand what the question is asking

**Calc**

I did simplify P' to be P'=-2p+33(p-9+100)+1(-p^2+33p+9) now I have to set the derivative,P', equal to zero and I do not know how to solve it.

**science**

How do you measure velocity???????

**Algebra**

I got 3p(-p^2+22) Now what

**Algebra**

I have learned factoring but I do not know what to do for this problem

**Algebra**

How do I solve -3p^2+66p=0

**PHILOSOPHY REPOST**

I'm sorry, I forgot it is thanksgiving in the States.

**PHILOSOPHY REPOST**

why is it wrong to teach creationism in a high school science class, based on the moral theory that the good of many outweigh the good of the individual? and im asking your personal opinion on this, im perfectly capable of going to google and typing in few key words.

**Chemistry**

i cant find a Ka chart that includes all those, and also, i wasnt even any numbers whatsoever to work with!

**Chemistry**

Rank the following compounds in order of increasing acid strength (1 = weakest, 4 = strongest) HCOOH CH2ClCOOH CHCl2COOH CH3COOH

**Oral speech**

bump?

**Oral speech**

Persuasive speech comparing old to modern games? I have to have a persuasive speech lasting 8-10 minutes, in which i am trying to persuade the listeners that modern games have came away from the "point" of a video game. and that old school games like SNES games and w...

**math**

an run contains 40 balls some red and some white if the probability of selecting a red ball is .45 how many red baslls are in the run?

**ACC**

A reason why absorption costing income statements are sometimes difficult for the manager to interpret is that: A)they omit variable expenses entirely in computing net operating income. B)they shift portions of fixed manufacturing overhead from period to period according to ch...

**ACC**

When sales are constant, but the production level fluctuates, net operating income determined by the variable costing method will: A)fluctuate in direct proportion to changes in production. B)remain constant. C)fluctuate inversely with changes in production. D)be greater than ...

**ACC**

someone help me with this questions please 1. How would the following costs be classified (product or period) under variable costing at a retail clothing store? Cost of purchasing clothing Sales commissions A) Product Product B) Product Period C) Period Product D) Period Perio...

**History**

I need to find detailed information on Charles Darwin, specifically, about his results and the RELIGIOUS PERSECUTION involved with it. Thanks in advance!

**Philsophy**

Please help! I need a case of scientific fraud where the scientist was working alone and unwilling to cooperate/get reviewed by other scientists. (the standard of openness must apply) goggle doesnt help at all, as my case is so specific!

**CHEMISTRY**

When 2.47 g of chromium is reacted with an excess of sulphur, the compound Cr2S3 results. Treating the Cr2S3 so formed with strontium metal converts all of the sulphur to SrS. Reacting the SrS with sodium metal then converts all the SrS to Na2S. What mass in grams of Na2S is p...

**Chemistry**

A sample of 1.029g of KC8H5O4 was titrated with an NAOH solution of unknown concentration. If 22.83 mL of base was used to reach the endpoint, what was the concentration of NaOH? What mass of KC8H5O4 should be used such that a volume of NaOH between 35-40 mL is needed to reach...

**Chemistry**

Calculate the molar solubilty of CaC2O4 in a solution that has been buffered to a pH of 4.00 Remember to account for reactions involving H2C2O4 acting as an acid in water. To account for the buffer, simply assume that H+ = 1.00X 10^-4

**Calculus Test Question ASAP**

The graph of y = cos x is concave down on which interval? (-pi,0)??????? please help!!!!

**Calculus Check**

A survey of one thousand people found that 70% of the people have a CD player, 85% have a telephone, and 45.2% have a computer. At least how many people have all three objects? Is the answer 152?

**Cacluluc CHECK**

A survey of one thousand people found that 70% of the people have a CD player, 85% have a telephone, and 45.2% have a computer. At least how many people have all three objects? Is the answer 152?

**Calculus Bonus**

Form two four-digit numbers from the digits 2, 3, 4, 5, 6, 7, 8, and 9, using each digit exactly once, so that the absolute value of the difference of the two numbers is as small as possible. I don't know where to start, any help would be greatly apprecitated.

**mathematics**

What is something that is about or exactly a kiloliter?

**mathematics**

What is something that is about or exactly a dekaliter?

**mathematics**

What is something that is about or exactly a decigram?

**mathematics**

What is something that is about or exactly deciliter?

**mathematics**

What is something that is about or exactly a centiliter?

**mathematics**

What is something that is about or exactly a centigram?

**mathematics**

What is something that is about or exactly a mililiter?

**mathematics**

What is something that is exactly or about a miligram?

**science**

What are the definitions for rock and mineral?

**Calculus Check**

A survey of one thousand people found that 70% of the people have a CD player, 85% have a telephone, and 45.2% have a computer. At least how many people have all three objects? Is the answer 258, because thats what I keep getting?

**Calculus Bonus**

Form two four-digit numbers from the digits 2, 3, 4, 5, 6, 7, 8, and 9, using each digit exactly once, so that the absolute value of the difference of the two numbers is as small as possible. Confused need to double check with you all.

**Calculus Bonus**

There is this bonus that I need so bad for my grade. I have tried several ways to answer this question and have tried several equations. Please Help Bouquets are priced on the basis of the numbers and types of flowers used. What is the price of the fourth bouquet? Bouquet 1 = ...

**Entropy**

Thank you. I was missing the units the whole time. S = H/T Convert kj to Joules; convert C to K.

**Entropy**

Tungsten has been used to make light bulb filaments since 1908. The melting point of tungsten is 3422C and the heat of fusion is 35 kJ/mole. Calculate the entropy change associated with the melting of one mole of tungsten.

**Calculus**

Tried this problem severeal ways. Get a different answer every time, but it is in the same ballpark. Any help would be much appreciated. How many zeros are at the end of the product of the first fifty positive integers?

**math**

Out of 39 students in a finite math class, 25 are male, 23 are business majors, 24 are first-year students, 15 are male business students, 18 are male first-year students, 16 are first-year students who are business majors, and 12 are male first-year business majors.

**Calculus Help?**

I have no idea where to start? A survey of one thousand people found that 70% of the people have a CD player, 85% have a telephone, and 45.2% have a computer. At least how many people have all three objects?

**Calculus**

A survey of one thousand people found that 70% of the people have a CD player, 85% have a telephone, and 45.2% have a computer. At least how many people have all three objects?

**Calculus**

How many zeros are at the end of the product of the first fifty positive integers?

**Calculus**

Form two four-digit numbers from the digits 2, 3, 4, 5, 6, 7, 8, and 9, using each digit exactly once, so that the absolute value of the difference of the two numbers is as small as possible.

**for reiny**

2. aren't your x and y intercepts the base and height of your triangle?? take area = 1/2 base*height = ..... = c which is the constant of the original equation!!! for this, you get 2c?

**calculus**

how can I calculate this deriivative: 1/(sin(x-sinx))?

**World History: Philosophy**

Thank you very much

**World History: Philosophy**

Oh, so he thought it was heretic to the Church

**World History: Philosophy**

Why does Emperor Justinian outlaw Greek Philosophy in 529 AD?????

**Calculus!!!**

the derivative of cot^3sqrtx Do you use prduct rule, if so what is your u,v, dv, or du.

**Calculus Verification**

I just want to make sure im right. Find the derivative if y= arcsec(x+3). I got 1 ======================= |x+3|sqrt(x+3)^(2)-1 Is this the final answer or do you need to solve (x+3)^2 and get (x^(2) + 9x + 9)

**Calculus Help!!!**

Find an equation for the tangent and normal to the curve x^2+y^2=9 at x=1 Do you have to simplify the problem to get y on one side. or is your u=x^2 v=y^2 du=2x dv=2y if so then what next?

**Calculus Help!!!!**

Fnd the derivative if y=x^(1+sqrt2) Is this right (1+sqrt2)/(x) x^(sqrt2)

**Calculus Help!!!**

Find the derivative if y=e^(2x)-lnx^(2) Im stuck, all i have is 2e^(2x)-2/x

**Calculus TEST!!!!**

Find an equation for the tangent and normal to the curve x^2+y^2=9 at x=1

**Calculus Test Question!!!!!**

Find the derivative if y=x^1+sqrt2

**Calculus Test Question!!!!!**

Find the derivative if y=sec^-1 (x+3) Please any help.

**Calculus**

Find the derivative if y=sin^-1 (3x)

**Calculus**

Find the derivative if y=sec^-1 (x+3)

**Fin&Acc**

B3 Company is a manufacturing firm that uses job-order costing. The company's inventory balances were as follows at the beginning and end of the year: Beginning Ending Raw materia $26,000 $31,000 Work in process 77,000 59,000 Finished goods 124,000 139,000 The company appl...

**Calculus**

Find the derivative if x^3 + 4xy^2 - y^4 = 7

**Calculus**

Find the derivative if y^3 + y = 2cosx

**Calculus**

Find an equation for the tangent and normal to the curve x^2 + y^2 = 9 at x=1

**Calculus?**

If a, b, and c are digits for which 7 a 2 -4 8 b ========= c 7 3 then a + b + b = _______ (A) 14 (B) 15 (C) 16 (D) 17 (E) 18

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