Thursday

October 27, 2016
Total # Posts: 1,191

**Science**

calculate the mass of sodium nitrate in grams in a 150 ml solution of a 5.00 M solution of sodium nitrate

*April 19, 2011*

**math/115**

evaluate -|-618| please help me, I just don't get it

*April 14, 2011*

**Chemistry**

I had to miss a lab yesterday. Do you know of a website where I can virtually prepare methyl salicylate (oil of wintergreen)? The experiment involves salicylic acid + methyl alcohol + concentrated sulfuric acid + heat....then when two layers form collect the top layer and ...

*April 13, 2011*

**physics**

"The mass density of brain matter is 1.040 g/cm^3, and of that, the mass fraction which is hydrogen, is 0.107. Find the number of hydrogen protons in a volume of 1cm^3 of brain tissue"

*April 11, 2011*

**physics**

We couldn't find "The mass density of brain matter is 1.040 g/cm^3, and of that, the mass fraction which is hydrogen, is 0.107. Find the number of hydrogen protons in a volume of 1cm^3 of brain tissue"

*April 11, 2011*

**chemistry **

how do you make 1.00g of NaC2H3O2 using: 0.400 M Na2Co3 0.300 M Pb(C2H3O2)2 NaOH solution with unknown molarity 0.500 M HC2H3O2 You don't have to use all of them

*April 6, 2011*

**freedom similes and metaphors?**

As free as the mind with imagination.

*April 3, 2011*

**science**

How many grams of oxalic acid dihydrate (H2C2O4) are needed to react with 38.56 ml of 0.2500 sodium hydorxide

*March 31, 2011*

**Chem**

Given this reaction: Pb(NO3)2 + 2 KCl --> PbCl2 + 2KNO a. How many milliliters of 2.00 M Pb(NO3)2 will react with 50.0 mL of 1.50 M KCl

*March 31, 2011*

**MATH**

If 20% of population have blue eyes, and 5 people are selected at random, what is the probability that at least 4 of them have blue eyes? HOW DO I FIND THE SOLUTION TO THIS PROBLEM?

*March 25, 2011*

**trig**

Evaluate each value as a trigonometric function of an angle in Quadrant 1. #1 cos (27pi/8)

*March 22, 2011*

**Dividing Decimals**

I don't get It neuther

*March 14, 2011*

**Dividing Decimals**

1.55

*March 14, 2011*

**PHI103:Informal Logic**

Grading Summary These are the automatically computed results of your exam. Grades for essay questions, and comments from your instructor, are in the "Details" section below. Date Taken: 8/16/2012 Time Spent: 47 min , 28 secs Points Received: 25 / 25 (100%) Question ...

*March 7, 2011*

**Biology**

The human retina has an area of about 1000 mm^2. If we have a total of 125 million rods and 6.5 million cones in each eye, show that we have about 131,500 sensory cells per square millimeter in the retina.

*March 3, 2011*

**Math**

Jim bought a pair of shoes for $50 and laces for $1. If the sales tax is 7%, how much tax must he pay?

*March 2, 2011*

**physics**

Lance threw a ball straight up into the air. The ball's gravitational potential energy at its peak height was 0.4 joules, and its speed when it hit the ground was 4 meters per second. What was the mass of the ball?

*March 2, 2011*

**Microbilogy**

Albert Kluyver "From elephant to...bacteria-it is all the same!" What did he mean?

*March 1, 2011*

**Statistics**

The probability that a football game will go into overtime is 20%. What is the probability that two of three football games will go to into overtime? A) 0.384 B) 0.2 C) 0.04 D) 0.096

*March 1, 2011*

**english**

lol, Writeacher-I missed that one myself, and usually don't! My mom taught me more than the teachers in school did about English and spelling, so I feel like a dolt for missing it!!

*February 24, 2011*

**english**

I'm no teacher or tutor, but wouldn't the word "so" work to join them?

*February 24, 2011*

**Microbiology**

People with Rhinovirus infections of the nose and throat have an 80-fold increase in kinins and no increase in histamine. What do you expect for rhinoviral symptoms? What disease is caused by rhinoviruses?

*February 24, 2011*

**Microbiology**

People with Rhinovirus infections of the nose and throat have an 80-fold increase in kinins and no increase in histamine. What do you expect for rhinoviral symptoms? What disease is caused by rhinoviruses?

*February 24, 2011*

**Chemistry**

Write an equation for the reaction that takes place when LiOH is added to water.

*February 23, 2011*

**Microbiology**

Alright then, thank you-I'll try looking for what you said and go from there. I don't need a great big answer for this-just a sentence or two.

*February 23, 2011*

**Microbiology**

Ugh, believe it or not, this is a "glossing over" of the subject-the book I have doesn't even go chapter-by chapter. It starts with chapter 1, and skips to 5! After that, it goes from 7 to 10. The whole book might be 20 chapters, but not chronological-they skip. ...

*February 23, 2011*

**Microbiology**

Thanks! would that be the anser though, to that question as well?

*February 23, 2011*

**Microbiology**

I don't know what those are-I'm just struggling to get through this little bit of Science for a college course.

*February 23, 2011*

**Microbiology**

Gram stains and acid-fast stains of pus showed gram-positive acid-fast rods. What are the possible organisms?

*February 23, 2011*

**College Algebra**

1=(X-100)/((X+100)/2)) / ((2-1)/((2+3)/2) Solve for X I know X =200, but don't understand how to reach that anwser.

*February 21, 2011*

**COM/155**

Last night I took my daughters to go see Justin Bieber, Never Say Never movie. Its about a 16-year-old pop star’s FIRST(adj) concert film. It also EXPLORES(adj) Justin’s personal journey to a sold out concert in Madison Square Garden last year. It details how Justin...

*February 20, 2011*

**COM/155**

Use at least five adverbs and five adjectives to write a brief review of a movie, sporting event, musical performance, or television show. I wrote my movie review but im really confused on which ones are adjectives and which ones are adverbs. could you please help me? Last ...

*February 20, 2011*

**english**

What can hold six gallons of water, be found in a survival kit, and be the size of my foot? (I wear a size 6 to 7.5 in shoes)

*February 17, 2011*

**Survey of the Sciences**

a typical cell in the body makes about 10 million molecules of atp per second. show that the cell breaks down about 263,258 molecules of glucose per second.

*February 15, 2011*

**math**

The house numbers on Carr Memorial Avenue follow a pattern.The first four houses on the left side of the street are numbered 8,14,20,and 26.How many more houses are on the left side of the street with numbers less than 50

*February 15, 2011*

**calculus**

no you can't find the y calues by using the equation to the tangent line because of the missing values for a, b and c. the first derivative is 2Ax+B so obviously that doesnt work out. but when we set it equal to zero, which we are supposed to do when we know all the values...

*February 10, 2011*

**calculus**

Let f(x)= Ax^2 + Bx + C. If f(x) passes through the point (-1,1) and has a relative minimum at (1,-13), find A, B, and C.

*February 10, 2011*

**Survey of the sciences**

When the hydronium ion comcentration of a solution equals 1 mole per liter, what is the pH of the solution? Is the solution acidic or basic?

*February 9, 2011*

**Survey of the sciences**

Show that one mole of sugar equals 342 grams.

*February 9, 2011*

**Physics- Vectors**

A bartender slides a beer mug at 1.4 m/s towards a customer at the end of a frictionless bar that is 1.8 m tall. The customer makes a grab for the mug and misses, and the mug sails off the end of the bar. (a) How far away from the end of the bar does the mug hit the floor? (b...

*February 5, 2011*

**MATH**

You have $110 IN YOUR lunch account and plan to spend $2.75 each school day. a) Write and graph a linear equation that represents the balance in your lunch account (i just need help making an equation for this problem) b) How many school days will it take to spend all of the ...

*February 5, 2011*

**economics**

the smith company made and sold 10,000 metal tables last year. when output was between 5,000 and 10,000 tables, its average variable cost was $24. in this output range, each table contributed 60 percent of its revenue to fixed costs and profit. what was the price per table?

*February 5, 2011*

**physics**

Carrying out the following mathematical manipulations: (5.78 +/- 0.04)^2 How do you set this problem up?

*February 4, 2011*

**Survey of the Sciences**

Thank you Damon! now, here's the last part of that along with the first again.... Calculate the height from which a block of ice at zero degrees celcius nust be dropped for it to completely melt upon impact. Assume that there is no air resistance and that all the energy ...

*February 2, 2011*

**Survey of the Sciences**

Calculate the height from which a block of ice at zero degrees celcius nust be dropped for it to completely melt upon impact. Assume that there is no air resistance and that all the energy goes into melting the ice.

*February 2, 2011*

**Criminal Justice**

I need to write a paper on the differences of police officers with a GEd and those with further education. Also do either have more civil rights complaints

*January 31, 2011*

**Physics**

Both block A and B mass 3kg and are initially 2m above the ground. They slide down a smooth ramp and then across a rough surface with a speed of 4m/s. How much energy did the block lose due to the friction along the rough surface? AND is transformed into what form of energy?

*January 30, 2011*

**finance**

Pick a company that pays dividends, then calculate the expected growth rate of your company using the CAPM. Once this task is complete, calculate the expected growth rate using the Constant Growth (or Gordon Growth) Model.

*January 23, 2011*

**Physics**

The radius of a circle is measured to be 12.8 ± 0.2 cm. I need to find the Area and the Circumference of the circle? But how to I account for the uncertainties in each value?

*January 21, 2011*

**Calc**

A mass is oscillating on the end of a spring. The distance, y, of the mass from its equilibrium point is given by the formula 2zcos(14πwt) where y is in centimeters, t is time in seconds, w and t and are positive constants. What is the furthest distance (cm) of the mass ...

*January 17, 2011*

**Calc**

A mass is oscillating on the end of a spring. The distance, y, of the mass from its equilibrium point is given by the formula 2zcos(14πwt) where y is in centimeters, t is time in seconds, w and t and are positive constants. What is the furthest distance (cm) of the mass ...

*January 17, 2011*

**Calc**

Consider a circle of radius 2 and a point P rotating around it. The angle θ, in radians, is given as a function of time t. (a) What is the value of θ when t=1.5? (b) Find the coordinates of P when t=1.5

*January 15, 2011*

**Chemistry**

370 mL

*January 9, 2011*

**7th grade social studies**

what was the importnat beaureacrats of the tang and song dynasties?

*January 3, 2011*

**statistics**

In baseball, is there a linear correlation between batting average and home run percentage? Let x represent the batting average of a professional baseball player. Let y represent the home run percentage (number of home runs per 100 times at bat). Suppose a random sample of ...

*December 19, 2010*

**College Math**

It is homework, I am doing the problems right now in Week 5 Assignment 2 of College Math at the AIPOD.

*December 12, 2010*

**Chemistry**

If 30.0 g of H2 were used, how many grams of NH3 would be made?

*December 11, 2010*

**Algebra**

correct!

*December 11, 2010*

**Chemistry. Help please**

Calculate the pH of a buffer solution made by mixing 174 mL of a 1.68M trimethylamine (CH3)3N solution with 250 mL of a 1.08M trimethylammonia chloride, (CH3)3NHCl solution.

*December 9, 2010*

**math**

break apart these numbers 40x16

*December 9, 2010*

**Chemistry. please help**

A 0.12 g sample of unknown was placed in a flask and dissolved in 125 mL of deionized water. A solution of HCl (0.10 M) was used to titrate the sample, and 18 mL was required to reach the endpoint. What is the formula weight of the unknown?

*December 8, 2010*

**chemistry**

Write the 12 mole ratios that can be derived from the equation for the combustion of isopropyl alcohol?

*December 8, 2010*

**geomety**

solve for x 5 + x 10 ----- = ---- x 8

*December 8, 2010*

**geometyr**

determine the perimeter of triangle KLM, if triangle KLM-triangle FGH, FG=30, GH=38, FH=38 and KL=24

*December 8, 2010*

**Europe**

What role did the geography of europe play in the development of and ways of life in these towns?

*December 6, 2010*

**Chem**

When dissolved in an aqueous solution, which of the following salts will yield a neutral solution? Choose one answer. a. KCN b. NaHSO4 c. Na3PO4 d. AlBr3 e. MgBr2

*December 3, 2010*

**Chemistry**

One of the most obvious ways to tell that a chemical reaction has occurred, as we all know, is that the color of 'stuff' changes. Ligand exchange reactions are one class of reactions where this is very evident, as exemplified by the color change of a green Ni(H2O)62+ ...

*December 1, 2010*

**Chemistry**

I posted a question at 5:43pm yesterday...can anyone please help with at least some of it? Thank you so much.

*November 26, 2010*

**Chemistry**

I really appreciate your help.

*November 25, 2010*

**Chemistry**

I have spent all afternoon (on Thanksgiving, no less) trying to figure out these post-lab questions. We had to produce a precipitate of a reaction of: 1) 1 ml 1M Na2SO4 + 9mL 1M CaCl2 Our result was .569g 2) 5 ml 1M Na2SO4 + 5 ml 1M CaCl2 Our result was .01g 3) 9 ml 1M Na2SO4...

*November 25, 2010*

**Physics**

When tossed upward and hit horizontally by a batter, a 0.23 kg softball receives an impulse of 2.0 N·s. With what horizontal speed does the ball move away from the bat?

*November 24, 2010*

**physics**

A horizontal force of 25 newtons pushes a box a distance of 30 meters across the floor. How much work is done by the force?

*November 23, 2010*

**Astronomy**

Which one supports the solar nebula theory of the origin of the solar system? a.Disks are rare around young stars. b.Disks are common around young stars. c.The sun is the least massive object in the solar system. d.Planets are round.

*November 23, 2010*

**science**

thank you! I just thought that just because jupiter is a gaseous planet that it would have a lesser mass.

*November 23, 2010*

**math**

Sevnety-eight players entered a single elimination tennis tournament.How many matches were played to determine the overall champ? please help me...and if u get the answer can you explain how you got it with a rule or a pattern

*November 18, 2010*

**language**

replacing with possessove nouns ex the sister Miguel woke up him. Miguel's sister woke up him

*November 16, 2010*

**11th grade**

At a glassware factory, molten cobalt glass is poured into molds to make paperweights. Each mold is a rectanglar prism whose height is 3 inches greater than the length of each side of the square base. A machine pours 20 cubic inches of liquid glass into each mold. What are the...

*November 15, 2010*

**geometyr**

given triangle QRS=triangle TUV, QR=2x=7, RS=13,and QS=3x+2 and TV=7x-6 find the value of x

*November 15, 2010*

**english**

thanks guys, but arethere any objects you think i can bring to school?

*November 13, 2010*

**english**

are there any objects that represent perseverence? and why? i need this for an english projcet

*November 13, 2010*

**college microeconomics**

Suppose that two players are playing the following game. Player 1 can choose either top or bottom, and Player 2 can choose either left of right. The payoffs are given in the following table Player 2 Left Right top 9,4 2,3 Player 1 Bottom 1,0 3,1 where the number on the left is...

*November 7, 2010*

**Algebra**

do the FOIL method f for first o for outer i for inner l for last (8y+5z)(8y-5z) 64y^2 + 40yz - 40yz + -25z^2 64y^2 - 25z^2

*November 4, 2010*

**math**

the answer is c

*November 4, 2010*

**Math**

-2 3/4 - 6 5/9=

*November 4, 2010*

**Math**

2 2/3 + -1 1/2=

*November 4, 2010*

**help!!! physics**

you want to nail a 1.6 kg board onto the wall of a barn. to position the board before nailing, you push it against the wall with a horizontal force to keep it from sliding to the ground. (a) if the coefficient of static friction between the board and wall is .79, what is the ...

*November 3, 2010*

**pysics**

a .15 kg ball is placed in a shallow wedge with an opening angle of 120 degrees. for each contatct point between the wedge and the ball, determine the force exerted on the ball. assume the system is frictionless.

*November 3, 2010*

**physics**

Let mass of hanging block be M Since in equilibrium the hanging mass MG = Tension in the wire Similarly along the incline Tension in the wire = 6.7 * g * sin 42 (Component of force along the incline) So equation both the equations: M*g = 6.7 * g * sin(42) M = 6.7*sin(42) So M...

*November 3, 2010*

**physics**

two blocks are connected by a string. the smooth incline surface makes an angle of 42 degrees with the horizontal, andthe block on the incline has a mass of 6.7 kg. find the mass of the hanging block that will cause the system to be in equilibrium. (the pully is assumed to be ...

*November 3, 2010*

**algebra**

when you solve a system of equations by the substitution method, how do you determine whether the system of equations is dependent?

*October 28, 2010*

**calculus**

Well, we know x=3 and y=8 and dx/dt=4. We need to find z (the distance from the particle to the origin) dy/dt, and finally our answer dz/dt. First solve for dy/dt y=2(3x+7)^(1/2) dy/dt=[2(1/2)(3x+7)^(-1/2)](3dx/dt) dy/dt=[(3x+7)^(-1/2)]3dx/dt dy/dt=[(3(3)+7)^(-1/2)](3(4)) dy/...

*October 26, 2010*

**chemistry**

strontium nitrate reacts with potassium iodate. What is its molecular,ionic and net ionic equations?

*October 23, 2010*

**statistics**

1.test wheter these samples represent populations that are different from the general population- sample of 10 with a mean of 44 and sample of 1 with a mean of 48. 2. The general population of individuals has a mean of 40 , a deviation of 6, and follows a normal curve. for ...

*October 22, 2010*

**Chemistry **

The following is given: 20 ml of HCl (2.0 M) added with 5 ml of Na2S2O3 (0.3 M) with 5 ml of H2O S2O3^-2(aq) + 2H^+1 (aq) --> S (s) + SO2 (g) + H2O (l) Calculate the following: a) Reaction rate when 30 mg of sulphur is formed (in 30 ml of solution) after 55 seconds. b) Rate...

*October 20, 2010*

**algebra**

the ratio of two integers is 9:7. their sum is 1024. find the two integers.

*October 19, 2010*

**English**

Thanks again. Believe I have hang of it now.

*October 18, 2010*

**English**

My last two that are confusing me. Identify verb and tell if transitive or intransitive. 1) Most people think of bamboo as a tree or a bush. 2) Bamboo belongs to the grass family. 1) think=intransitive 2) belongs=intransitive

*October 18, 2010*

**English**

Thank you very much.

*October 18, 2010*

**English**

Please check and see if I answered correctly. Have to identify the verb and tell if intransitive or transitive 1. In China people eat the tender shoots as a vegetable. 2. The Japanese also make flutes from the stems. 3. In some countries, bamboo cages hold animals. 1.eat=...

*October 18, 2010*

**PHYSICS**

Actually there are 3600seconds per hour. So the answer of 29.06m/s is correct.

*October 17, 2010*