Sunday

August 30, 2015
Total # Posts: 1,764

**College Chemistry**

Thanks for your help! I understand number 2, but I still don't get number 1. Is there any other way to explain it?
*March 7, 2010*

**College Chemistry**

What is the pH of the following solutions? 1)a solution that is 5.4×10−2 M in HClO4 and 3.0×10−2 M in HCl 2)a solution that is 1.80% HCl by mass (Assume a density of 1.01g/mL for the solution.) Please help! I am so confused!
*March 7, 2010*

**CHEMISTRY**

Is non-dairy creamer a colloidal dispersion
*March 7, 2010*

**CHEMISTRY**

Would non-dairy creamer also be a colloidal dispersion when placed in water?
*March 7, 2010*

**CHEMISTRY**

If a pinch of flour is placed in water, does it form a coarse suspension, colloidal dispersion, or true solution? What about pepper? I thought both would be a coarse suspension
*March 7, 2010*

**CHEMISTRY**

Would non-dairy creamer also be a colloidal dispersion if it is put in water?
*March 6, 2010*

**CHEMISTRY**

When powdered milk is added to water, is it a coarse suspension, true solution, or colliodal dispersion? What about baking soda in water?
*March 6, 2010*

**physics**

Water flows over Victoria Falls, which is 128 m high, at a rate of 1.4 x 106 kg/s. If half the potential energy of this water were converted into electric energy, how much electric power would be produced by these falls?
*March 4, 2010*

**Math**

Ok i got that too... it comes to a fraction but then when you check it in the equations you don't get the same answer.
*February 28, 2010*

**Math**

Solve the system of linear equations by elimination. Thank You for your help. 8x+10y=3 3x-5y=2
*February 28, 2010*

**math**

6 6 6 6 = 5 fill in the expressions to make this equation true
*February 28, 2010*

**Calc**

how do i begin to solve this? integral of (1/x^2)sec(1/x)tan91/x)dx I tried substituting tan(1/x) for u but i couldn't get it to work...
*February 27, 2010*

**Calc**

that is actually the answer (that my book gives) how did you get that??
*February 27, 2010*

**Calc**

How do i begin to solve this? integralof dx/(cube root of 3x+4)
*February 27, 2010*

**Geometry**

B (i think)
*February 24, 2010*

**Physics**

Two blocks are connected by a light string passing over a pulley. The inclined surfaces are frictionless, and the effects of the pulley can be ignored. The value of m1 = m2 = 1.0 kg and θ2 = 43.4 degrees. If the blocks accelerate to the right with acceleration a = 0.280 m...
*February 23, 2010*

**physics**

Small, slowly moving spherical particles experience a drag force given by Stokes’ law: where r is the radius of the particle, is its speed, and η is the coefficient of viscosity of the fluid medium. (a) Estimate the terminal speed of a spherical pollution particle of...
*February 19, 2010*

**math**

MIX W 5 CUPS CONCENTRATE AND 8 CUPS COLD WATER. SUPPOSE YOU MAKE ONLY 1 CUP OF MIX W. hOW MUCH WATER AND HOW MUCH CONCENTRATE DO YOU NEED?
*February 16, 2010*

**english composition **

i have a hard time understanding to write essay and start paragraph
*February 13, 2010*

**college**

how do you start with an essay with contrast and compare about your life now and five years ago ?
*February 13, 2010*

**statistics**

If ten households in this area are selected at random, what is the probability that exactly two of them will be in violation of this law?
*February 11, 2010*

**Physics**

If you can throw a ball vertically upward to a height h = 30.5 m, what is the maximum horizontal range over which you can throw the same ball, assuming you throw it at the same initial speed?
*February 8, 2010*

**Physics**

A rock thrown horizontally from the top of a radio tower lands 20.0 m from the base of the tower. If the speed at which the object was projected was 11.50 m/s, how high is the tower?
*February 8, 2010*

**physics**

A ball is thrown upward from a platform 4.6 m high with a speed of 23 m/s at an angle of 40 o from the horizontal. What is the magnitude of its velocity when it hits the ground?
*February 8, 2010*

**AP world history**

Okay thanks, I'm writing a document based question and my teacher isn't very good at helping me with anything. I found the religions they gave me to work with so not helpful or relative to each other in anyway.
*February 7, 2010*

**AP world history**

Religions of common geographic origins tend to differ from others that originate in other areas of the world. How do religions having common geographic origins tend to share somewhat common codes of behavior and views or the nature and reason for existence?
*February 7, 2010*

**chemistry**

I put down that there are 98 protons, 3 neutrons
*February 4, 2010*

**chemistry**

State everything you know about the following atoms. Do NOT assume that they are balanced or neutral. Atomic number = 98 Mass number = 101
*February 4, 2010*

**Physics-College**

You have a 50V battery in a circuit with a single resistor R. If the resistor dissipates 200 J of energy in 5 seconds, what is its resistance?
*February 4, 2010*

**College Physics**

For the speed at which the ball was launched I got 18.12m/s. That part was right according to the computer. I didn't understand parts b or c of the question. For part a you multiplied vt by .608 instead of .6018 and that is why I got a different answer. Could you explain ...
*February 1, 2010*

**College Physics**

A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*February 1, 2010*

**college Physics**

The coordinates of an object moving in the xy plane vary with time according to the following equations x = −7.16 sin ùt and y = 4.00 − 7.16 cos ùt, where ù is a constant, x and y are in meters, and t is in seconds. Write expressions for the ...
*January 31, 2010*

**college Physics I**

I have tried to put the numbers in the equation, but I am not getting the correct answer. Is there an easier way to explain it?
*January 29, 2010*

**college Physics I**

A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*January 29, 2010*

**college Physics**

A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*January 29, 2010*

**math/probability**

Assume that the weight loss for the first two months of a diet program has a uniform distribution over the interval 6 to 12 pounds. Find the probability that a person on this diet loses more than 11 pounds in the first two months.
*January 24, 2010*

**Chem Apps**

The solubility of sugar (surcose) in water is 4.0 g/mL at room temperature, what is the maximum amount of sugar that will dissolve in 850 mL of water?
*January 21, 2010*

**Chemistry**

The mass percent of a three component gas sample is 95.2% PF5, 1.40% C2H2 and 3.40% C3H6. Calculate the partial pressure (atm) of PF5 if the total pressure of the sample is 570.0 torr.
*January 20, 2010*

**4th grade**

I need to know I good way to do long division. The problem is: It takes 14 oranges to make a small pitcher of juice. Annette has 112 oranges. How many pitchers of juice can she make?
*January 20, 2010*

**spanish**

What does this mean: Cantas en el coro?
*January 14, 2010*

**Statistics**

I have to analyze a statistical research paper and have never done so. How do I analyze statistical data and where do I find sources to support my analysis?
*January 14, 2010*

**Social studies**

What word means to be the best in trade? None of my notes tell me this
*January 13, 2010*

**Cultural Diversity**

when looking for your community would you look up by the town in which you live in
*January 12, 2010*

**Math**

A square is inscribed in a circle of radius r. Express the length of the side of the square in terms of r.
*January 11, 2010*

**Calculus**

The function f is continuous on the closed interval [1,7] and has values in the table below x f(x) 1 10 4 30 6 40 7 20 Usinf the subintervals [1,4] [4,6] [6,7] what is the trapezoidal apporx. of the integral from 1 to 7 of f(x)dx? The answer: 160 I tried doing each interval as...
*January 11, 2010*

**Calculus**

Alright, I found -1/4cos(x)^4 but I didn't get the right answer. Did I dint the wrong anti-derivative? Do I have to do reverse chain rule and get... (-1/4cos(x))sin(x)^4?
*January 11, 2010*

**Calculus**

Let F(x) be an antiderivative of sin^3(x). If F(1)=0 then F(8)=? The answer: 0.632 How do I get to that answer? Do I find the antiderivatie and solve for F(x) when x=8?
*January 11, 2010*

**Calculus**

If the integral from a to b of f(x)dx=a+2b then integral from a to b of (f(x)+3)dx= ? The answer: 5b-2a How do I get to that answer??
*January 11, 2010*

**Math**

If cosx=sqrt{3}/2 and −pi/2<=x<=0 then the exact value of x, in radians
*January 10, 2010*

**elementry math **

A box contains three black balls and two gold balls. A ball is selected at random, its color is recorded, and it is then replaced. A second ball is then selected at random and its color recorded. The outcome associated with this type of selection is an ordered pair (first draw...
*January 10, 2010*

**World History**

In what ways were the great civilizations of the New World similar to those of the Old World?
*January 8, 2010*

**Chemistry**

How do you calculate the molar masses for Strontium Phosphate and Chromium(III)Nitride using significant figures correctly?
*January 3, 2010*

**chemistry**

Hi there, I am having a problem with this question, any help would be great. Use the following balanced chemical equation to calculate the mass of carbon dioxide produced from the burning of 5.50 kg of jet fuel which can be represented by the molecule C12H26. You should quote ...
*January 2, 2010*

**5th grade**

accb divided by ab
*December 16, 2009*

**education**

I don't understand the question or even where to find the answer. I sent an email to the teacher and shes not responding to me.
*December 12, 2009*

**education**

Write a 350- to 500-word response to the following: You have the ability to choose three or four books for your students. Based on what you have learned in this course, how can you assess the level of bias and stereotypes in the contents of these texts? What are your criteria...
*December 12, 2009*

**chemistry**

Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant. For example, the residual pressure in a can is 1.36 atm when it is sitting on a shelf ...
*December 6, 2009*

**math**

aly, its not 8 hrs......
*December 3, 2009*

**physics**

three dogs play tug-of-war with a chew toy. Each dog pulls with a force that is horizontal with the ground. Determine the net force acting on the chew toy and the acceleration of the chew toy if its mass is 325g. (ignore friction and gravity) Dog 1 pull: 48.2N at 215 degrees ...
*December 3, 2009*

**Physics**

If an object is hung from a cable with a weight of 40 N, what is the tension in the two cables? I got some answers, but it would be best if I knew if I was doing the problems correctly before I do the rest of the worksheet. I did a bunch of work, but it's really messy so I...
*December 2, 2009*

**reading/writing**

I have to pick a creative selection such as a painting, political cartoon, or lyrics form a song, poem etc, and I need to complete the following. 1. What observations I can make about this selection 2. What questions can I develop form these observations 3. What prior ...
*December 2, 2009*

**Math**

Is 3x-4=12 a linear equation? i know that 3x=16 but would that be considered linear? it would just be a vertical line correct?
*December 1, 2009*

**Calculus**

An airplane flies at an altitude of 5 miles toward a point directly over an observer. The speed of the plane is 600 mi/hr. Find the rate at which the angle of elevation is changing when the angle is 30 degrees. I found the answer to be 60 radians/hr by taking the derivative of...
*November 19, 2009*

**Physics**

In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 1.75 m and cross the bar with a speed of 0.63 m/s?
*November 18, 2009*

**Physics **

An astronaut stands on the edge of a lunar crater and throws a half-eaten Twinkie™ horizontally with a velocity of 2.2 m/s. The floor of the crater is 95.4 m below the astronaut. What horizontal distance will the Twinkie™ travel before hitting the floor of the crater...
*November 9, 2009*

**spanish**

how do u anwser this question in spanish ¿Qué haces los sábados?
*November 7, 2009*

**English**

gxuwer6dydgusawutdfugasufgusgufguageydfusdgfusgdugudgufgdgufsguftutdefuystfugdsudgfudsgugfusdgfusgu
*November 3, 2009*

**math **

Find the z-score for the given raw score, mean, and standard deviation. Assume a normal probability distribution. Raw score = 15, ì = 16 , and ó = 2
*November 1, 2009*

**math**

Decide which of the variables described is likely to have a normal or near-normal distribution. 3) a. The amount of change held by a teacher at the end of each day for a year b. The amount of property taxes paid by homeowners in a new "affordable housing" subdivision...
*November 1, 2009*

**social studies**

unscramble artiotinm
*October 30, 2009*

**math**

nevermind
*October 27, 2009*

**math**

Given f(x)=x^2, describe (in words) the transformation on f that would produce g(x)=-2(x+4)^2-7?
*October 27, 2009*

**physical**

Write one additional audit question for each of the categories (board, staff, donors and fund raisers, clients/customers, volunteers, and society
*October 19, 2009*

**Science**

Changes in the environment are monitored by (blank)satellites.
*October 19, 2009*

**Calculus**

We are doing problems with the product and quotient rules, but I'm not sure if I'm doing them correctly. If someone could check my answer I would really appreciate it. The original problem was y = (2x-1)^5 * (4x+1)^-1 and I got the derivative to equal y' = [(2x-1)^...
*October 13, 2009*

**Algebra**

I am solving X^4-3x^2+2=0 I factored it to be (x^2-2)(x+1)(x-1) as my book suggested. But why is it three sets of parentheses? How do you know that it's supposed to be three sets of parentheses in opposed to two or four? And how come one of the answers according to my book...
*October 8, 2009*

**Algebra**

I have to figure out how x^3+216=0 is factored, and what potential solutions might be. I factored it like this: (x+3)(x+3)(x+24), resulting in the solutions being -3 (double route) and -24. But my book says these are not correct answers. Why not? Can you show me how to do it ...
*October 8, 2009*

**Algebra**

x^3-3x^2+3x-9=0. My book factors it to x^2(x-3)+3(x-3)=0, but then it magically becomes (x-3)(x^2+3). I have no idea how it became these numbers. Could you explain please? Thanks!
*October 7, 2009*

**Algebra**

Why did you square root the second line? Would you please be able to explain? Thanks!
*October 7, 2009*

**Algebra**

4x^4-18x^2=0. I have to find out what x equals by factoring. What I did was Factor 2x^2(2x^2+-9)=0 then 2x^2(2x+3)(x+-3), resulting in -1.5 and three. But these answers are wrong according to my book. Can you show me step by step how to do this correctly? It would be a huge help!
*October 7, 2009*

**Science**

the term _________________ refers to rain, sleet, or snow that contain acidic compounds.
*September 29, 2009*

**math**

I really need help on my homework :(
*September 28, 2009*

**Chem I**

Are there any tricks for remembering solubility rules? I am having a hard time remembering which compounds are soluble and which are not. Any suggestions would be appreciated, I just get the soluble/insoluble compounds mixed up sometimes.
*September 28, 2009*

**world history**

can you help me with this question? According to the clockmaker analogy did Voltaire believe that God was present in the world?
*September 28, 2009*

**world history**

Was plato's ideal form of government philsopher kings.
*September 26, 2009*

**World History**

Can you check my answer: Question: What were the key events that shaped Plato's beliefs? My answer: Plato was influenced by Socrates to search for the meaning of life. But after Socrates was executed Plato focused on how society would bring out the best in people.
*September 26, 2009*

**Calculus**

How would you find the derivative of f(x)=1/sqrtx using limits? I know how to do problems with a fraction or a square root, but I can't figure out how to do one with both. I have tried a few different starts, but always end up getting stuck.
*September 20, 2009*

**math**

Explain Why is1734 greater than175?
*September 17, 2009*

**arithmetic**

nth term expressions whose 8th term is 74
*September 17, 2009*

**Calc**

Oh! I've seen that equation we just don't call it a derivative. thanks!
*September 10, 2009*

**Calc**

what is a derivitive? And how do you get it (f(x)=2x) from f(x)=x^2-3?
*September 10, 2009*

**10th grade math**

Try making both 2 and 1 negative
*September 10, 2009*

**10th grade math**

Then you would use FOIL, and find which two numbers multiply to get 2, and add to get -3
*September 10, 2009*

**10th grade math**

do you know how to use the diamond? or were you taught with the FOIL square?
*September 10, 2009*

**Calc**

Thank you.
*September 10, 2009*

**Calc**

I don't understand how you got from lim (1+sinx/x)/(1+cosx/x) to the answer. I know that sinx/x is 1 so would the top be 2?
*September 10, 2009*

**Calc**

How do you find the lim as x->infinity of (x+sin(x))/(x+cos(x))??
*September 10, 2009*

**Calc**

How do you find the avarage rate of change for f(x)=1+sin(x) in the interval [0,pi/2]?
*September 10, 2009*

**Calc**

where did you get f(x)=2x??
*September 10, 2009*