Saturday

October 25, 2014

October 25, 2014

Total # Posts: 772

**Chemistry**

What volume of 0.170 M K3PO4(aq) must be added to 50.3 mL of 0.103 M K2HPO4(aq) to prepare a buffer solution with a pH of 12.09?
*October 21, 2014*

**Physics**

Spiderman is standing on the edge of a rooftop 100m above a swimming pool. He decides to jump in to cool off, so he springs out at a velocity of 30 m/s at an angle of 35 degrees above the horizontal. The near edge pool is located 127 m from the base of the building. It is a ...
*October 13, 2014*

**psychology**

The the psychological perspective of empiricism (the belief that your knowledge of the world is based on careful observation and not common sense or observation) fall relate more to the concept of "nature" or "nurture"? I'm currently leaning more ...
*October 7, 2014*

**psychology**

The the psychological perspective of empiricism (the belief that your knowledge of the world is based on careful observation and not common sense or observation) fall relate more to the concept of "nature" or "nurture"? I'm currently leaning more ...
*October 7, 2014*

**Basic Chemical Engineering**

Uh..i have done this research before, and sincerely it is not of great help to me. If there is any other link showing step by step the different procedures in the dyeing process, that u could give me, it would be great sir!
*October 5, 2014*

**Basic Chemical Engineering**

Can someone plz give me the link of the process flow diagram of a textile(dyehouse)? I only need to know the procedures of the main components in the dyeing section. Plz help!
*October 5, 2014*

**Calculus**

Integrate sqrt(x^2 + x) dx I have completed the squares and got x^2-x = (x+1/2)^2 -1/4 Now i dont know how to proceed, plz help me!
*October 5, 2014*

**Physics**

HI I'm just looking for an answer for 3 questions as my textbook does not explain the answer. How a tin can loses heat through: 1) Conduction 2) Convection 3) Radiation
*September 30, 2014*

**PHI208**

In Held’s article it is claimed that 1. Hobbes conceives of humans in the state of nature as Creative creatures who work with one another to establish communities Fully grown and having no ties to any other humans Interested in the well-being of the groups they are part ...
*September 28, 2014*

**Reading**

no thats my classmate we are both trying to figure this out
*September 22, 2014*

**Reading**

can you explain because i am very confused and dont understand the difference
*September 22, 2014*

**Math**

What is the definition of a multiple
*September 14, 2014*

**Math Multiplication**

Thank you!!!! Ur awesome!
*September 11, 2014*

**Math Multiplication**

Im not sure about 60,36,and 18 the rest im fine with
*September 11, 2014*

**Math Multiplication**

Im not sure about a few facts...
*September 11, 2014*

**Math Multiplication **

What are all the multiplication facts for 60,36,48,20,25,40,50,30,100,15,18,and 12?
*September 11, 2014*

**precalculus**

The equation of the line joining the complex numbers -5 + 4i and 7 + 2i can be expressed in the form az + b \overline{z} = 38 for some complex numbers a and b. Find the product ab. I can get the equation of the line by slope intercept but I don't know how to do this in the...
*September 6, 2014*

**Math/chem**

If the temperature of a solution goes up 25degrees in 7 minutes, what is the rate of change of temperature? (Rate= temp. Change/ time)
*September 3, 2014*

**chemistry **

A student needs 1.00 mol of H2SO4 for an experiment. How many liters of 0.60 M H2SO4 does she need to obtain?
*August 18, 2014*

**accounting**

Here is some other information I forgot to include (well, not really information, but part of the problem that I'd already solved): Total Appraised Value = $995,000 Total Apportioned Cost = $820,000
*August 8, 2014*

**accounting**

Timberly Construction negotiates a lump-sum purchase of several assets from a company that is going out of business. The purchase is completed on January 1, 2013, at a total cash price of $820,000 for a building, land, land improvements, and four vehicles. The estimated market...
*August 8, 2014*

**Chemistry**

I need help i do not know how to do this problem at all. A 30.00 mL sample of 0.1500 M hydroazoic acid (HN3; Ka = 1.9 x 10-5) is titrated with 0.1000 M KOH. Calculate the pH after the following volumes have been added:
*August 4, 2014*

**Spanish**

Sorry, i will be sure to number the questions next time. I put quotation marks where it should have been underlined, but i'm positive the last one is A. Thank you for your help!! ♥
*July 7, 2014*

**Spanish**

Hey, i just wanted to know if i got the questions right? Thanks Choose the sentence in which the verb, shown in quotation marks, is grammatically correct. A. El principe no "está" en casa. ➭B. ¿Dónde "es" Maria? C. Ella "est...
*July 7, 2014*

**physics**

For a football player bending the ball around a defensive wall, state three principles which govern the flight path of the ball and the amount of spin imparted on to the ball? (3 marks) please help?
*June 24, 2014*

**Spanish**

Thank you for explaining each question and helping me :)
*June 20, 2014*

**Spanish**

I'm suppose to translate the English sentences into Spanish sentences. Have i done the grammar,meaning, and spelling right? 1.) El rey que usado canta está jugando el tambor. The king that used to sing is playing the drum. 2.) Él y ella está bebiendo ...
*June 20, 2014*

**Calculus**

The CIA published data about foreign countries on its web page. In particular they show total population as well as population growth. If a student is looking at Russia, they will see that the total population of Russia is declining. When they look at the table that shows ...
*June 17, 2014*

**Calculus**

So would it be -.010526 = (dV/dt)/V ?
*June 17, 2014*

**Calculus**

The last question for this problem asks to find the relative rate of change in the home's value at any time t. How would I do that?
*June 17, 2014*

**Calculus**

If the question says to write the differential equation "in thousands of dollars" would the particular solution be written as V(t)=240e^((-.010526)(t)) instead of V = 240,000 e^-.010526 t ?
*June 17, 2014*

**Calculus**

The median value of a home in a particular market is decreasing exponentially. If the value of a home was initially $240,000, then its value two years later is $235,000. a) Write a differential equation that models this situation. Let V represent the value of the home (in ...
*June 17, 2014*

**Calculus**

dy/dx = 4ye^(5x) a) Separate the differential equation, then integrate both sides. b) Write the general solution as a function y(x). For the second part, I got y(x)=e^((5e^(5x))/(5)) + C but I don't understand how to separate differential equations and/or integrate both ...
*June 16, 2014*

**Calculus**

So is the total distance 54?
*June 9, 2014*

**Calculus**

I got 0. That doesn't make sense to me... x(0) = 3(0)^2 - 18(0) + C = 0+C x(6) = 3(6)^2 - 18(6) + C = 108-108+C = 0+C x(6)-x(0)=0
*June 9, 2014*

**Calculus**

Assume v(t) = 6t - 18 on the interval [0, 6]. Find the total distance that the object traveled on [0, 6].
*June 9, 2014*

**Calculus**

My only options are: -12 6 -18 -6
*June 9, 2014*

**Calculus**

What is the total change of f(x), if f'(x) = 2x - 3x^2, over the interval [0, 3]?
*June 9, 2014*

**Calculus**

The rate of change in the volume of a tank is known to be dV/dt=0.6t*cos(0.08t^2 -1), where V(t) is in gallons per minute and 0<=t<=10 (0 is less than or equal to t which is less than or equal to 10). If the tank has a volume of 14 gallons initially, what is its volume ...
*June 8, 2014*

**Calculus**

So the answer would be -cos(2)+4=4.416?
*June 7, 2014*

**Calculus**

An object with an initial position of x(0) = 3 has a velocity of v(t) =sin(t). Find its position at t =2.
*June 7, 2014*

**calc**

The base of a three-dimensional figure is bound by the line y = 6 - 2x on the interval [-1, 2]. Vertical cross sections that are perpendicular to the x-axis are rectangles with height equal to 2. Find the volume of the figure. The base of a three-dimensional figure is bound by...
*June 6, 2014*

**math**

Assume a cube with all sides equal to x. Let the change in x with respect to t; x(t) = 2t + 1. What is the formula for the rate of change of the volume of the cube?
*June 6, 2014*

**Spanish**

Bonito should be bonita and señor should be señora. I think i get it. In English you would just call someone American, but in Spanish you have to identify if they are a man or women so you would say Americano and Americana. Thank you so much!!
*June 4, 2014*

**Spanish**

I'm doing my work but i don't get these three questions at all. Could you explain them as well? ★Which part of this sentence is not correct? Esta muchacha tan bonito es alta. A. Esta B. bonito ✔C. muchacha ★Choose the correct verb for tastes in the ...
*June 4, 2014*

**statistics**

A sample of n= 4 scores has SS equals 48 what is the estimated standard error for the sample mean
*May 31, 2014*

**English Lit**

Is it biased?
*May 27, 2014*

**English Lit**

Help I have no clue!!! A novel is an example of what type of source? Secondary, biased, tertiary, primary
*May 27, 2014*

**Math**

Q1. A population has a mean of µ = 80 with σ = 20. a. If a single score is randomly selected from this population, how much distance, on average, should you find between the score and the population mean? 20 because the standard deviation is 20 b. If a sample of n...
*May 27, 2014*

**English**

4 Is not grammatically correct it would be I want to learn how to drive.
*May 27, 2014*

**HELP!!!! MATH**

thank you! I guess I did it wrong
*May 22, 2014*

**HELP!!!! MATH**

A boat drops an anchor to the bottom of a lake. The anchor rope makes a 15 degree angle with the boat. The anchor rope is 24 feet long. How deep is the lake to the nearest foot?
*May 22, 2014*

**math**

A boat drops an anchor to the bottom of a lake. The anchor rope makes a 15 degree angle with the boat. The anchor rope is 24 feet long. How deep is the lake to the nearest foot?
*May 22, 2014*

**biology**

which of the following is not a part of the theory of evolution
*May 13, 2014*

**Chemistry**

Ahh!! Sorry for the grammar errors. :/ I was typing on my phone...thank you so much DrBob222! ^^ Do you think you might be able to explain how the reactants resulted into such a product for problem #6 and 7? I will presume problem #5 is a double replacement?
*May 10, 2014*

**Chemistry**

How would you write these chemical reactions?Can someone do one or two reactions for each problem, so I could get an idea of to them? ..I'm nit sure how most of the oeoducts wouls turn out..especially if it is a precipitate. 5. When Mn^2+ ions are separated from the ...
*May 10, 2014*

**Spanish Proofreading**

I haven't been able to meet with my Spanish professor to go over my short composition (it basically had to be a past narration using only the preterite and imperfect). If any Spanish speakers wouldn't mind reading it and letting me know what I need to correct that ...
*May 4, 2014*

**Spanish Proofreading**

Thank you so much for your help! I just have one more question. I changed "teníamos mucho de diversión" to "nos divertíamos mucho cuando estábamos jugando en la nieve". Does that look correct? I was trying to add a little bit of ...
*May 4, 2014*

**Spanish Proofreading**

Ok, thank you!
*May 4, 2014*

**Spanish Proofreading**

I haven't been able to meet with my Spanish professor to go over my short composition (it basically had to be a past narration using only the preterite and imperfect). If any Spanish speakers wouldn't mind reading it and letting me know what I need to correct that ...
*May 4, 2014*

**Math**

Last week we talked about Order of Operation or (PEMDAS) and this week we are solving Linear Equations. Is there any relation to the two practices? Think about it, are the processes similar? Is the process reversed? I think that there is a relation between the two but I just ...
*May 1, 2014*

**chemistry**

What is the difference between the speed of a moving object and its velocity?
*April 10, 2014*

**Math **

To win a certain board game, a tossed token must land on a shaded square on the board. The probability of winning is approximately 23%. If the board has a total area of 130 congruent squares, how many of these squares are shaded?
*April 8, 2014*

**chemistry**

I got it! Nevermind! I just was assuming the wrong equation went to completion! Thank you for asking me to type it out! It definitely helped me! :)
*April 3, 2014*

**chemistry**

And then the KF reaction will go to completion because it is completely soluable!
*April 3, 2014*

**chemistry**

Oh! I think I just caught my mistake...HF is a weak acid, so that reaction does not go to completion....
*April 3, 2014*

**chemistry**

the formatting is a little off, I'm so sorry. Let me know if you need me to re-type it.
*April 3, 2014*

**chemistry**

I tried to find the numbers I need for the HH equation, and I can't seem to find the correct way to use my chemical equation to find them. H+ + KF -> HF + K+ .01 .005 0 0 -.005 -.005 +.005 +.005 .005 0 .005 .005 <moles left at equilibrium KF <-> F- + K+ 0 0 ....
*April 3, 2014*

**chemistry**

calculate the pH of the solution when 100mL of .05M KF is mixed with 200mL of .05M HF; Ka (HF) = 3.467x10^-4. I tried to use the Henderson Hasselbach equation to get the correct answer (pH=3.16) but can't seem to get it correct. Any help would be AMAZING! Thank you in ...
*April 3, 2014*

**chemistry**

I'm stuck on this problem and only have 2 attempts left. The Ksp of Zn(OH)2 is 1.8x10^-14. Find Ecell for the following half-reaction. Zn(OH)2(s) + 2e^- <-> Zn(s) +2OH^-(aq) So far I've tried using the following methods, none of which have worked... Ecell = (0....
*April 2, 2014*

**Algebra II**

Graph the following inequalities y<2x-9 y=>-5x+3
*April 2, 2014*

**Algebra II**

Flying against the wind, a jet travels 3220 miles in 7 hours. Flying with the wind, the same jet travels 2820 miles in 3 hours. What is the rate of the jet in still air and what is the rate of the wind?
*April 2, 2014*

**Chemistry**

"Determine the volume of a 0.925M K2Cr2O7 solution required to completely react with 5.28g of Cu." My attempted method for solving was to convert the 5.28g of Cu to moles, find moles of K2Cr2O7 using the mole to mole ratio, and then use M=mol/L to solve for volume. ...
*March 26, 2014*

**Chemistry**

"Determine the volume of a 0.925M K2Cr2O7 solution required to completely react with 5.28g of Cu." My attempted method for solving was to convert the 5.28g of Cu to moles, find moles of K2Cr2O7 using the mole to mole ratio, and then use M=mol/L to solve for volume. ...
*March 26, 2014*

**algebra 2**

Identify the form of the equation (standard, vertex, intercept), tell if it opens up or down and give the axis of symmetry. y=-4x^2+3x+-6 Walk me through this please?
*March 25, 2014*

**General Chemistry **

A piston has an external pressure of 7.00 atm. How much work has been done in joules if the cylinder goes from a volume of 0.130 liters to 0.650 liters. Express your answer with the appropriate units.
*March 20, 2014*

**chemistry**

Just as I thought, it was much easier than I was making it out to be haha Thank you!
*March 19, 2014*

**chemistry**

I feel like this question is pretty easy, but I can't seem to figure out how to go about solving it. It's like the solution is on the tip of my tongue: Nitromethane (CH3NO2) burns in air to produce significan amounts of heat. 2 CH3NO2(l) + 3/2 O2(g) -> 2 CO2(g) + 3 ...
*March 19, 2014*

**Physics**

A piece of metal has a mass of 85 cg and a volume of 450L. What is it's density in g/cm3?
*March 5, 2014*

**Physics**

how many centimeters long is the proverbial "10-foot pole?"
*March 5, 2014*

**Physics**

A satellite that is 4175 miles from the center of the earth, orbits with a period of 90 minutes. What is its centripetal acceleration?
*March 5, 2014*

**Physics**

You throw a ball horizontally off a building with a horizontal velocity of 10m/s. What is the ball's horizontal velocity 5 seconds later. What is the ball's vertical velocity 5 seconds later?
*March 5, 2014*

**AED**

This is the first page of what I found at National Access Network website. 1 SOUTH DAKOTA Char Gatje, Director of Research South Dakota Education Association I. GENERAL BACKGROUND State The current state aid formula was passed by the 1995 legislature and is based on a per ...
*March 4, 2014*

**AED**

I am a little confused on how I go about writing these? Go to the National Access Network website and review the educational funding issues for South Dakota. Try to find information about the affect of school choice options on educational funding. From DQ 1, describe how ...
*March 4, 2014*

**statistics**

When calculating a confidence interval for the difference between two means, what information are you gaining? The means are from both same population and different? Thank you.
*February 28, 2014*

**Statistics**

When calculating a confidence interval for the difference between two means, what information are one gaining?
*February 28, 2014*

**Statistics**

A report says that the between-subjects factor of participants’ salary produced significant differences in self-esteem. (a) What does this tell you about the design? (b) What does it tell you about the results?
*February 26, 2014*

**Statistics**

A report says that the between-subjects factor of participants’ salary produced significant differences in self-esteem. (a) What does this tell you about the design? (b) What does it tell you about the results? 19.(a) Source Sum Squares df Mean Square F Between 134.800 3 ...
*February 26, 2014*

**Statistics in Psychology**

Please Help! For the following, which type of t-test is required? (a) Studying the effects of a memory drug on Alzheimer’s patients, testing a group of patients before and after administration of the drug. (b) Studying whether men and women rate the persuasiveness of an ...
*February 26, 2014*

**Statistics**

Summarize the steps involved in analyzing the results of a one-sample experiment.
*February 23, 2014*

**chemistry**

I got 30 this time! Yay! Thank you so much DrBob222! I really appreciate it!
*February 13, 2014*

**chemistry**

I got 23...but the answers available are a. 10 mL b. 30 mL c. 50 mL d. 100 mL ... is there something that I am doing incorrectly?
*February 13, 2014*

**chemistry**

An ice-bath made with sodium chloride will be 9 ± 1 oC when the solution is about 23% sodium chloride by mass. The density of solid sodium chloride is about 2 g/cm3. What volume of solid NaCl would you add to 200 g water to make a 23% NaCl solution? ANY HELP WOULD BE ...
*February 13, 2014*

**Statistics**

If the population is normally distribution then the sample must be normally distributed even for small sample size? True or False. The variance of the standard normal distribution is always equal to 1.? True or False. A continuous random variable may not be normally ...
*February 7, 2014*

**Statistics**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
*February 7, 2014*

**Statistics**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
*February 7, 2014*

**physics**

One gram of nickel has 1.026 × 1022 atoms, and each nickel atom has 28 electrons. How many electrons are contained in 6.00 g of nickel? The elemental charge is 1.6 × 10−19 C. Answer in units of electrons
*February 7, 2014*

**chemistry**

2)Tf = (0.00089 +/- 0.00008) * (13 +/- 2) + (19.627 +/- 0.004) Tf = (0.012 +/- 0.002) + (19.627 +/- 0.004) Tf = 19.639 +/- what value?
*February 7, 2014*

**physics Work unit**

1. A football player pushes a tackle dummy forwards at a constant 0.85m/s for 11m using 7150J of energy. The tackling dummy mass is 120kg. a) find force the player exerts? b) what is the frictional force the dummy exerts? c) what work is done by the friction as the dummy is ...
*February 1, 2014*

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