Thursday
October 30, 2014

Posts by Ben


Total # Posts: 695

CHEM
oops, thanks for the help!
September 16, 2010

CHEM
The vapor pressure of pure water at 25 °C is 23.8 torr. Determine the vapor pressure (torr) of water at 25 °C above a solution prepared by dissolving 35 g of urea (a nonvolatile, non-electrolyte, MW = 60.0 g/mol) in 75 g of water. where have i made a mistake? 35g/60=0....
September 16, 2010

About Chemistry
The vapor pressure of pure water at 25 °C is 23.8 torr. Determine the vapor pressure (torr) of water at 25 °C above a solution prepared by dissolving 35 g of urea (a nonvolatile, non-electrolyte, MW = 60.0 g/mol) in 75 g of water. im not sure about the steps for ...
September 15, 2010

Chemistry
Calculate the amount of heat required to raise the temperature of a 54 g sample of water from 5°C to 20.°C.
September 15, 2010

math
0.331,0.332,0.333
September 15, 2010

Chemistry
What is the formula of a substance that contains 0.0920 g of C and 0.0180 g of H?
September 7, 2010

math
One of the angles of a right triangle measures 30°, and the hypotenuse is 10 inches long. How long is the side opposite the 30° angle?
September 5, 2010

geometry
The side of a triangle opposite a 58° measures 15 inches. To the nearest hundredth of an inch, what is the length of the side opposite a 53° angle
September 5, 2010

Calculus
No. I have no idea how to do this. I did part a and part be right but i cant do this part c
September 3, 2010

Calculus
Compute the average velocity over time intervals [4, 4.01] , [4, 4.001] , [4, 4.0001] , [3.9999, 4] , [3.999, 4] , [3.99, 4] . Use this to estimate the object's instantaneous velocity at t=4 V(4) = ???? ft/ec How do i even approach this problem?
September 3, 2010

Calculus
How do I find the instantaneous ROC at x=1.5
September 3, 2010

English (E-mail Writing)
Thanks a ton for the link, I really appreciate it!
July 27, 2010

English (E-mail Writing)
Oh wow, thanks a lot. I guess I was looking for something longer, because her e-mail was a good 6 paragraphs or so. When writing these sorts of e-mails, is there a trick to make it seem more formal and not informal?
July 27, 2010

English (E-mail Writing)
I want to do some research with a professor on campus, but I'm having a lot of trouble composing this e-mail. She sent me a long e-mail with stipulations for joining her lab and at the end it basically says "If you agree to all this, let me know and we'll set up a...
July 27, 2010

college math213
Try putting the parentheses around two numbers and figure out what you get. Don't forget that you do operations in parentheses first. For example: 16-7+5=4 You could do: (16-7)+ 5 = 4 OR 16-(7+5) = 4 Which one would be right?
July 27, 2010

Physics
A machine carries a 4.5 kg package from an initial position of di = (0.50 m) + (0.75 m) + (0.20 m) at t = 0 to a final position of df = (7.60 m) + (12.0 m) + (7.30 m) at t = 11 s. The constant force applied by the machine on the package is F = (2.00 N) + (4.00 N) + (6.00 N...
July 22, 2010

math
(x^4 - 8x^2 + 15) = (x^2-3)(x^2-5) so there will be a (x^2-3) term in the numerator and denominator that will cancel leaving (x^2-5)
July 17, 2010

Pythagorean Theorem
40 cm
July 15, 2010

ap chemistry
yeah sorry
July 7, 2010

ap chemistry
The vitamin niacin can be isolated from lover, yeast, milk, and whole grain. Which source would be the best for a multivitamin tablet
July 7, 2010

algebra
if x varies inversely as w, and z=40 when w=.06, fine z when w=20
June 24, 2010

american government
2. In federalism, the national government (Points : 1)
June 23, 2010

physics
Two packages at UPS start sliding down the 20° ramp shown in Figure P8.25. Package A has a mass of 3.5 kg and a ­coefficient of friction of 0.20. Package B has a mass of 10 kg and a coefficient of friction of 0.15. How long does it take package A to reach the bottom?
June 16, 2010

Computer Science JAVA FUNCTIONS
Write a Function You will be given one of the following problems to solve using and writing Python functions. Given a list of words, return an array which indicates the frequency that each letter occurs. For example, in the list [”apple”, ”bob”], [ ’a...
May 31, 2010

computer science
Hey I have three questions with creating these methods can any of you guys write an example code for this? Thanks Write a Function You will be given one of the following problems to solve using and writing Java functions. 1. Given a list of words, return an array which ...
May 28, 2010

computer science
Hey I have three questions with creating these methods, thanks. Write a Function You will be given one of the following problems to solve using and writing Java functions. 1. Given a list of words, return an array which indicates the frequency that each letter occurs. For ...
May 28, 2010

algebra
length and width of a rectangle A=198 in width =x length =x+7
May 15, 2010

physics
The potential energy stored in the compressed spring of a dart gun, with a spring constant of 36.00 N/m, is 0.880 J. Find by how much is the spring is compressed.
May 10, 2010

physics
The potential energy stored in the compressed spring of a dart gun, with a spring constant of 36.00 N/m, is 0.880 J. Find by how much is the spring is compressed.
May 10, 2010

physics
The potential energy stored in the compressed spring of a dart gun, with a spring constant of 36.00 N/m, is 0.880 J. Find by how much is the spring is compressed.
May 10, 2010

geometry
the slope of a line that is perpendicular to (2,4) and (-1,0) is
May 10, 2010

4th grade
Hi
May 6, 2010

economics
Suppose velocity is stable, What would the Federal Reserve need to know in order to keep output at its natural level following a supply shock?
May 3, 2010

phys101
The heat-energy needed to produce any temperature change in the liquid is: DeltaH = mass x heat-capacity x DeltaT where DeltaT is the change in temperature. The heat-energy needed to melt the ice is: Hmelting = mass x heat-of-fusion Lets assume the final temperature is 'T...
April 29, 2010

alegbra
The answers are all coordinates in this format: (x,y) The first equation y=0, means that the answer looks like this: (x,y=0) or (x,0) If y=0, you can replace y in the second equation so you get x=0+2=2 So x=2. Answer: b) (x=2,y=0) or (2,0)
April 29, 2010

science
Describe the bonds that "un-zip" during the replication of dna.
April 26, 2010

science
Describe the bonds that "un-zip" during the replication of dna.
April 26, 2010

9th grade English
you need an apostrophe on "Tybalts" in the last line. Nice job
April 7, 2010

8th grade algebra
exponent of 1000
March 30, 2010

american intercontinental university
The fresh water should taste sweet because of the sugar residue left in your mouth
March 30, 2010

Algebra
2x-6y<18 when I change this to the other form I get y>-2/6+(-3)but when I graph it all the points come out = to instead of > than. What am I doing wrong.
March 30, 2010

6th grade Language Arts
We made a compromise
March 30, 2010

chemistry
Thank you very much for your time.
March 15, 2010

chemistry
Nitroglycerine decomposes according the the equation: 4C3H5(NO3)3 -> 12 CO2 + 10 H2O +6N2 + O2. 15.0 g of nitroglycerine is placed in a 500 ml flask at 25.0 C. The vapor pressure of water at this temperature is 23.8 mmhg. Find the total pressure in the flask after the ...
March 15, 2010

physics
rofl do you go to W-L?
March 10, 2010

Physics
A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is 7.0 ...
March 7, 2010

Physics
A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is 7.0 ...
March 7, 2010

math algegra
one type of probablity used practically daily is?
February 27, 2010

Math
how do you solve: 2A^2-7a-15
February 24, 2010

Mathematics
Thanks. i worked it out and it came out to = 4 liters
February 24, 2010

geography
what is china's culture? please give examplesa Thank you!
February 23, 2010

Chemistry
A sample of .234g of carbon is placed in a closed stainless steel bomb with .502g of of oxygen gas. The mixture is ignited giving of carbon dioxide. How many grams of carbon dioxide should be obtained upon combustion?
February 21, 2010

Finance
John borrowed $1,000 discounted at 10% for six months. How much did he receive when the loan was made? I get $952.38 by using the formula below: 1000=P(1+.10/2)^(.5*2) - am I doing this right?
February 18, 2010

Finance
Determine the amount of each payment to be made to a sinking fund in order that enough money will be available to pay off the following loan. $29,000 loan, money earns 12% compounded annually, 42 months. I tired doing this using the future value of an ordinary annuity formula...
February 18, 2010

Economics
This chart shows the components of nominal GDP for the years 2000 and 2001. All figures are in billions of current dollars. Components 2000 2001 Consumption $6,684 $6,987 Investment $1,755 $1,560 Government Spending $1,751 $1,858 Exports $1,101 $1,034 Imports $1,467 $1,383 ...
February 7, 2010

Economics
What percentage of GDP in 2000 is consumption
February 7, 2010

Math (repost)
In standard form, find the equation of the circle that passes through the origin and x-intercept 1 and y-intercept 2. (I fixed a correction a little too late after a response.) Help please? thanks!
February 7, 2010

Physics
Calculate the speed needed by a spacecraft to maintain a circular orbit at about 350 km above Earth’s surface. (it's a project where we create our own spaceship. let's say the craft is 500kg) --- Not sure about the formula to find this. All I know is that it may ...
February 6, 2010

Math
woah, oops. the y-intercept is 2.
February 6, 2010

algebra
You can work a total of no more than 34 hours per week at your two jobs. House cleaning pays $8 per hour and your sales job pays $6 per hour. You need to earn at least $245 per week to cover your expenses. Write a system of inequalities that shows the various numbers of hours ...
February 4, 2010

chemistyr
0.115
February 2, 2010

math/probability
the anwser is 4
January 15, 2010

Pre-algebra
nope,I'm not very good in math as well :(
December 13, 2009

Social Studies
What is the Socratic Method?
December 13, 2009

Pre-algebra
hi,are you good at World History?
December 13, 2009

Social Studies
Um excuse me,could you help me with this one problem I have?I don't understand it
December 13, 2009

science
Hi, quick question: Graphite is burned in oxygen to give carbon monoxide and carbon dioxide. If the product mixture is 33% CO and 67% CO2 by mass, what is the heat from the combustion of 1.00 g of graphite? dH values: CO:-110.5 kj/mol, CO2: -393.5 kj/mol Thanks!
November 24, 2009

Calculus
Use linear approximation, i.e. the tangent line, to approximate 8.4^(1/3) as follows: Let f(x)= x^(1/3) . The equation of the tangent line to f(x) at x=8 can be written in the form y=mx+c where m=1/12 and c=4/3: Using this, find our approximation for 8.4^(1/3).
November 15, 2009

AP Chem
This post helped immensely, thank you so much and merry Christmas!
November 12, 2009

science
which of earth's spheres extends into all others
November 11, 2009

Math
Use linear approximation, i.e. the tangent line, to approximate sqrt[3] { 8.4 } as follows: Let f(x) = sqrt[3] x. The equation of the tangent line to f(x) at x = 8 can be written as y=mx+c where m=1/12 b=4/3 find the approximation for sqrt[3] {8.4}
November 8, 2009

8th grade
Please Help Me. I'm doing a Science Fair Project, and I need help with finding simmilar experiments to mine. My experiment is: Which saliva is cleaner: Cat, Dog, or Human???
October 28, 2009

world history
why did the industrialized nations of the world embark so aggressively upon imperialist ventures between 1880 and 1914?
October 26, 2009

Physics (Rotational Kinetic Energy)
Hello, The question is: A solid ball rolls along the floor with a constant linear speed v. Find the fraction of its total kinetic energy that is in the form of rotational kinetic energy about the center of the ball. Krot/Ktotal = ? The answer I keep getting is 3/1, but the ...
October 21, 2009

psychology
It also depends on the habituation of the stimulus. Rather than conditioned excitation, you would get conditioned inhibition here.
October 21, 2009

Biology
How is the expression of sex-linked genes similar and different from the expression of autosomal genes?
October 21, 2009

Biology
How is the expression of sex-linked genes similar and different from the expression of autosomal genes?
October 20, 2009

french
YOU legs hurt?
October 20, 2009

English
free verse does not mean don't use needed punctuation or capitalization. As I searched for examples of free verse, I found many that didn't have punctuation (which caused ideas and thoughts to run together) and didn't have capitalization, which distracts from the ...
October 20, 2009

Biology
I am having trouble descibing how the expression of sex-linked genes is similar and different from the expression of autosomal genes?
October 20, 2009

economics
Suppose that the government decides to charge cola consumers an excise tax. Before the tax, the market is in equilibrium, where 12 million cases of cola are sold every month at a price of $3.50 per case. After the tax, 6 million cases of cola are sold every month; consumers ...
October 16, 2009

math 8th grade
72/100=x/200 **cross mulitply: 100x=72*200 100x=14400 x=14400/100 x=144 ______ Or just multiply .72 by 200 .72*200=144
October 5, 2009

Physics (Normal Force)
When a book weighing 10 N is placed on a table, the table exerts a normal force of 10 N on the book. When a crate weighing 250 N is placed on the same table, the table exerts a normal force of 250 N on the crate. Explain the mechanism that allows the table to exert just the ...
October 1, 2009

calculus
how do you solve e^(9ln2)
September 29, 2009

10th grade algebra
7x-15y+9=0 **Subtract 9 from both sides 7x-15y=-9 **Subtract 7x from both sides -15y=-7x-9 **Divide both sides by -15 y=(7/15)x+(9/15) <--- equation isolate for y
September 22, 2009

chemistry
12
September 18, 2009

biology
What do you think?
September 7, 2009

Math (Angle Calculation)
Would -75.74 degrees be the same as 284.26 degrees?
September 7, 2009

math
Could you tell me how exactly to graph piecewise functions.
July 23, 2009

pchem
Use R = 8.2 × 10–5 m3 atm/mol K and NA = 6.02 × 1023 mol–1. The approximate number of air molecules in a 1 m3 volume at room temperature (300 K) and atomospheric pressure is: 41 450 2.5 × 1025 2.7 × 1026 5.4 × 1026
June 24, 2009

Chemistry College (Need to know!)
How is this Possible GK. Everywhere I have looked, including mark schemes and chemistry websites dH(solution) is worked out via this equation: dH(solution) = dH(LE) - dH(hyd) + dH(hyd) What is it you are working out with solute and solvent?
June 11, 2009

Chemistry College (Need to know!)
Am I Correct in assuming this? dH of solution = -dH of lattice enthalpy + dH of hydration E.g: dHsolution NaCl = -dHLE NaCl(s) + dHhyd Na+(g) + dHhyd Cl-(g) Units as kJmol-1
June 11, 2009

Chemistry College
Am I Correct in assuming this? dH of solution = -dH of lattice enthalpy + dH of hydration E.g: ÄHsolution NaCl = -ÄHLE NaCl(s) + ÄHhyd Na+(g) + ÄHhyd Cl-(g) Units as kJmol-1
June 10, 2009

Chemistry College
Well to be honest I wasn't there for the teaching of this in my class due to University interviews. I was just wondering how you actually work through them as other websites i have been on have all been in too much (universty standard) detail. Thank you for the fast response!
June 10, 2009

Chemistry College
Is there a simple formula for the Enthalpy of solution and/or hydration?
June 10, 2009

english
hi what does this quote mean I am responsible. Although I may not be able to prevent the worst from happening, I am responsible for my attitude toward the inevitable misfortunes that darken life. Bad things do happen; how I respond to them defines my character and the quality ...
May 24, 2009

8th grade
its not beef flat retard.
April 1, 2009

us
hi i have to write a paper stating that malcolm x was a better leader than martin luther king jr. I need a lot of help
March 30, 2009

history
what other civil rights leaders could i really use
March 24, 2009

history
hi. I need to write a 5 page paper describing how Martin Luther King's leadership was not needed in the civil rights movement. I need a lot of help and information. Thank you soo soo much.
March 24, 2009

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