Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 4,797

**chemistry**

A 2.00 g sample of a particular compound was dissolved in 15.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85ºC. For pure CCl4, TB = 76.50ºC and KB = 5.03°C·kg/mol Calculate the boiling point elevation, ΔTB, ...
*May 4, 2014*

**chemistry**

The acid dissociation constant, Ka, for this reaction is given by the following formula (this is also in your book): Ka=[H3O+][A−][HA] The acid concentration, [HA] is given in the introductory information of this problem. Using this information and your answers from the ...
*May 4, 2014*

**chemistry**

The chemical reaction for dissociation of an acid is: HA + H2O → H3O+ + A- Assuming all of the hydronium ion (calculated in in the previous problem) comes from this reaction, what is the concentration of conjugate base, [A-], in this system?
*May 4, 2014*

**chemistry**

The pH of a 0.00100 M solution of a particular acid is 4.95 at 25°C. Use the solution pH to calculate the concentration of hydronium ion present [H3O+]
*May 4, 2014*

**physics**

Consider a rectangular swimming pool of depth 2.3 m with a width and length of 13 m. What is the force exerted by the water on one of the sidewalls of the pool?
*May 3, 2014*

**Spanish 1**

How do you respond to these spanish questions? ¿Como se llaman tus padres? ¿De donde son? ¿Donde trabajan? ¿Cuantos hermanos tienes?¿Como se llaman?Donde estudian o trabajan? Cuantos primos tienes?Cuales son los apellidos de ellos?¿...
*April 30, 2014*

**statistics**

Build a 95% confidence interval for the mean of the population from the given sample data. Assume that the population has a normal distribution. 16.4, 15.7, 16.2, 15.8 17.1 15.8, 15.9, 16.0, 16.4 15.0 *please help me solve this! I have no clue what I am supposed to do
*April 29, 2014*

**Math -Help**

you have a space in your garden for 100 small flowering bulbs. Crocus bulbs cost $0.45 each, and daffodil bulbs cost $0.85 each. Your budget allows you to spend $55.80 on bulbs. How many crocus bulbs and how many daffodil bulbs can you buy?
*April 29, 2014*

**Biology**

The gene encoding for body color in zombie flies is "X-linked". Gray bodies are the wild-type trait and blue bodies are caused by a mutation - Set up a cross between a male with a blue body and a female who is homozygous dominant for a gray body. Indicate the geno ...
*April 27, 2014*

**Biology**

Punnett Square Help 1) Set up a Di-hybrid cross for these two traits (pod color and shape) Note:Green pods are dominate over yellow pods and inflated pods are dominant over constricted pods -Start off with both parents as heterozygotes/hybrids for BOTH genes and assume the ...
*April 27, 2014*

**Math- urgent**

4.9 So $4.90?
*April 27, 2014*

**Math- urgent**

Harry buys American cheese at the deli. He buys 1/4 pound at the cost of x dollars per pound. If he pays $12.25 for 2.5 pounds of cheese, what is the cost per pound? Please show your work.
*April 27, 2014*

**Math- urgent**

Thank you!
*April 27, 2014*

**Math- urgent**

Z/2-6=4 What does z equal? Please show your work.
*April 27, 2014*

**Physics**

A glass window pane has an area of 3.50 m2 and a thickness of 0.600 cm. If the temperature difference between its surfaces is 23.0°C, what is the rate of energy transfer by conduction through the window?
*April 22, 2014*

**health**

Which symptoms are more common in depressed children and adolescents than in adults with depression? A. Fears of separation B. Reluctance to meet people C. General aches and pains D. All of the above
*April 19, 2014*

**health**

I think its with b or c?
*April 19, 2014*

**health**

What is major depressive disorder? A. A disorder that is enabling and helps a person function normally B. A disorder characterized by symptoms that interferes with a person’s ability to work, sleep, study, eat, and enjoy once-pleasurable activities C. A disorder ...
*April 19, 2014*

**budgiting**

Which one of the following statements best describes a budget "blind spot"? A. Too little money was set aside to cover an expense. B. This is an expense the person overlooked or did not account for when setting up the budget. C. This is an item that requires periodic...
*April 18, 2014*

**Health**

The ________the concentration of HIV in semen or genital fluids, the more likely it is that HIV will be transmitted to a sex partner. A. Lower B. Weaker C. Higher D. All of the above
*April 17, 2014*

**Health**

________ is the most frequently reported bacterial sexually transmitted disease in the United States. A. Chlamydia B. Syphilis C. Herpes D. Gonorrhea
*April 17, 2014*

**Math- urgent**

How can -2.65 be written as the ratio of two integers?
*April 16, 2014*

**Chemistry**

For the balanced redox reaction 2 Al(s) + 3 Br2(g) → Al2Br6(s), determine the number of electrons transferred in the overall reaction.
*April 14, 2014*

**DrBob222**

Just for my understanding if you don't mind could you explain how you were able to get 5e? I was able to derive everything else except that portion.
*April 14, 2014*

**Math**

Bobo bought a 1 ft squared block of cheese. He needs to cut it into 3 in. cubes. The block is yellow outside but green on the inside. How many 3 in. cubes does it have? How many of the cubes have no yellow face, one yellow face, 2 yellow face, etc. Please help!!!
*April 13, 2014*

**Algebra**

Bobo bought a 1 ft squared block of cheese. He needs to cut it into 3 in. cubes. The block is yellow outside but green on the inside. How many 3 in. cubes does it have? How many of the cubes have no yellow face, one yellow face, 2 yellow face, etc. Please help!!!
*April 12, 2014*

**Chemistry**

That's brilliant help :) thank you so much
*April 12, 2014*

**Chemistry**

im just stuck on how to do the last part. 5.00 = 4.74 + lot (15/x) Solve for x = millimoles acetic acid and convert that to grams in 500 mL solution ? thank you very much
*April 12, 2014*

**Chemistry**

Calculate pH of an acetate buffer containing 27.5 mM acetic acid (pKa is 4.74) and 50 mM sodium acetate. When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid (in g) to be added to 0.5 L of this sodium ...
*April 12, 2014*

**Calculus**

When one-sided limits are not equal to each other at a point, what can be said about the continuity of the function at that point? I know that when one-sided are not equal to each other then the limit does not exist at that point. but i do not know what can be said about the ...
*April 11, 2014*

**Calculus**

Use the alternate definition, lim x->a f(x)-f(a)/x-a, to determine the instantaneous rate of change of f(x)= 1/x at the point (1,1/5) a)1/5 b)-1/5 c)1/25 d)-1/25
*April 11, 2014*

**University**

yes, it will be treated the same :)
*April 10, 2014*

**University- Canada**

Getting a degree from a university or college is pretty much the same and they both are good. Now, some Canadian colleges give out diplomas (for certain courses)and diplomas are not as high as degrees. This is mainly because diplomas can be earned in under 4 years which the ...
*April 10, 2014*

**Calculus**

Would you be able to help me with a couple of questions? thanks in advanced! 1. I am given the graph f(x)=x^2-2x. I have to draw a line tangent to the point (0,0). Then, I have to estimate the slope at that point. how would I go about answering this question? would I first ...
*April 10, 2014*

**Calculus**

Thanks Steve! For 2a, I meant 5/2+x, then i got 5/2+1 and then 5/3
*April 10, 2014*

**Calculus**

I was wondering if you would be able to check if my answers are correct: 1. An oil tank is being drained for cleaning. After t minutes there are v litres of oil left in the tank, where v(t)=40(20-t)^2, 0<=t<=20. Determine the rate of change at the time t=10. For this ...
*April 10, 2014*

**Calculus**

I am stuck on both of these questions. Would you please tell me if my reasoning is correct? 1. An object is dropped off a building. When comparing the average velocity of the object over equal time intervals, explain the difference between early time intervals and later time ...
*April 10, 2014*

**Calculus**

which of the following is not a type of break in the graph? a) holes b) horizontal asymptotes c) jumps d) vertical asymptotes I know for sure that a is not the answer and i doubt that c is the answer. I think the answer would be b. 2. Describe what can be inferred about the ...
*April 9, 2014*

**Calculus**

I am re-posting this question because i wrote the incorrect function last time. An oil tank is being drained for cleaning. After t minutes there are v litres of oil left in the tank, where v(t)=35(25-t)^2, 0<=t<=25 a) determine the average rate of change of volume during...
*April 9, 2014*

**health service management**

Do you feel that benchmarking decreases creativity? Explain your answer.
*April 9, 2014*

**Calculus**

I have a couple of questions and i wanted to know if my answers are correct. Thanks in advanced! 1. Determine the values of x for which the function f(x)=x+2/x-2 is discontinuous Would the answers be x=2 because the function would be undefined? 2. An oil tank is being drained ...
*April 9, 2014*

**statistics**

Since, in general, the longer a car is owned the more miles it travels one can say there is ______ between age of a car and milege. a positive association, no association, a negative association, a scattered association
*April 2, 2014*

**Physics**

A 2115 kg car moving east at 10.61 m/s col- lides with a 3169 kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 32.4◦ north of east and at a speed of 5.03 m/s. What was the speed of the 3169 kg car before the collision?
*April 1, 2014*

**Physics**

sorry, my diagram is not showing properly .. it is a pulley with mass one hanging from the left side and mass two hanging from the right side
*April 1, 2014*

**Physics**

For the system of two crates and a pulley in the figure below, what fraction of the total kinetic energy resides in the pulley? (Assume m1 = 14 kg, m2 = 10 kg and mpulley = 5 kg.) (( o )) | | | | [m1] | [m2]
*April 1, 2014*

**Math- urgent**

The second of two numbers is five more than the twice first. The sum of the numbers is 44. Find the numbers. Show all work.
*April 1, 2014*

**Physics**

A 3000N force stretches a wire by 2.0mm. A second wire of the same material is twice as long and has twice the diameter. How much force is needed to stretch it by 1.0 mm?
*March 31, 2014*

**Physics**

A 0.559 kg particle has a speed of 2.7 m/s at point A and kinetic energy of 8.4 J at point B. What is its kinetic energy at A?
*March 31, 2014*

**Biology (fetal pig)**

What substance passes through the glottis? [Is it Air??] What substances passes through the esophagus? [I don't know if this is food] please help. thanks
*March 28, 2014*

**physics**

what is the final temperature when 3 pound of water at 100 degree fahrenheit is added to 500 lb at 40 degree fahrenheit
*March 26, 2014*

**history**

Which of the following is true of the Industrial Workers of the World (I.W.W.)? A. It was founded in Russia. B. It made business leaders create new methods to deal with labor issues. C. It had very little influence over the labor movement. D. It was devoted to organizing ...
*March 25, 2014*

**Maths **

A population of 3.5 million bacteria increases by 48800 How many bacteria are there now?
*March 23, 2014*

**us history**

I just took this quiz and got 8 out of 10. you got all of these correct, except 8 is d, and 10 is also d. Hope this helps! ~Sarah :)
*March 19, 2014*

**AED**

I need help in trying to figure out why teachers in the Northern states are being paid more then those in the South? And also why more money is being spent on student's education in the North. Thank you!
*March 17, 2014*

**Global Studies (Please help)**

come on this is easy! 1. a 2. d 3. a you're welcome :P
*March 10, 2014*

**World Geography**

Imagine you are an elected official with the responsibility of drafting legislation designed to protect our environment. What items will you include in your bill? Who will be responsible for the bill's implementation? Its enforcement? Your response should be 200 words in ...
*March 6, 2014*

**Math**

Given l || m, m<9 = 9x + 5, and m<5 = x+ 37, find the value of x
*March 6, 2014*

**Math**

Find the measure of the sides of an equilateral (triangle)PQR if PQ = 5x - 7 and PR = 2x + 5
*March 6, 2014*

**Math**

Given m<10 = 5x + 2, and m<6 = 3x + 28, find the value of x so that l || m
*March 6, 2014*

**physics**

A string going over a massless frictionless pulley connects two blocks of masses 4.4 kg and 11 kg. As shown on the picture below, the 4.4 kg block lies on a 23◦ incline; the coefficient of kinetic friction between the block and the incline is μ = 0.29. The 11 kg ...
*March 6, 2014*

**physics**

A roller-coaster car of mass 1.80 103 kg is initially at the top of a rise at point circle a. It then moves 40.8 m at an angle of 50.0° below the horizontal to a lower point circle b. (a) Find both the potential energy of the system when the car is at points circle a and ...
*March 4, 2014*

**Differential Equations**

Before retirement: dy/dt = .07y+5000 separate and solve: 1/(.07y+5000)dy = dt (1/.07)*ln(.07y+5000) = t+c ln(.07y+5000) = .07t+c .07y+5000 = ce^(.07t) y = [c*e^(.07t)-5000]/.07 plug in y(0)=0 to find c. c=5000 so y = [5000e^(.07t)-5000]/.07 plug in t=30 to get y=511869.27 (...
*March 4, 2014*

**chemistry**

Calculate the mass of nickel(II) sulfate and the mass of water contained in 200. g of a 6.00% solution of nickel(II) sulfate
*March 4, 2014*

**SOCIAL STUDIES**

WHY DO I LOVE SOCIAL STUDIES???????
*March 4, 2014*

**Geometry**

thank you
*March 4, 2014*

**Geometry**

Which of the following is not a postulate used to prove the congruence of two triangles? a. ASA b. SSA c. SAS d. SSS I think its C?
*March 4, 2014*

**Biology**

Which earthworm organ serves excretory function by excreting metabolic waste?
*March 3, 2014*

**Chemistry**

How would applying an external pressure on the following equilibrium affects the distribution of iodide between the polar (aqueous) and non polar (varsol)
*March 2, 2014*

**history **

True or False Rutherford Hayes won a landslide victory in the election of 1876. I'm not sure if this statement is true or false because he lost the election originally but then won in the reelection process
*March 1, 2014*

**history **

Andrew Johnson’s plan for Reconstruction was based on A. his strong belief in Negro suffrage B. his belief that Indians were savages C. a strict adherence to the Constitution; hence, since the former Confederate states had left the Union, great changes had to be made ...
*March 1, 2014*

**Chemistry**

Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide. The byproduct is water. 637.2g of ammonia are reacted with 787.3 g of carbon dioxide.
*February 28, 2014*

**Biology**

Conducting cells in xylem are: Sieve tube elements Tracheids Tracheids and vessel elements Vessel elements Tracheids and sieve tube elements please help with my homework thanks.
*February 27, 2014*

**Biology**

Organisms that assemble their own organic molecules from water and elements that they absorb from their environment are which of the following? Is this detritivore or decomposer? I am confused by these two. thanks
*February 27, 2014*

**AED **

Read the following scenario: You are a second-grade teacher at Happy Valley Elementary School. You are teaching language arts and social studies. Your classroom of 21 students consists of 7 white students, 5 Latino students, 4 African American students, 3 Native American ...
*February 27, 2014*

**Chem 1150**

One tablespoon of peanut butter has a mass of 17g . It is combusted in a calorimeter whose heat capacity is 130kJ/∘C . The temperature of the calorimeter rises from 22.5∘C to 25.3∘C. Find the food caloric content of peanut butter.
*February 25, 2014*

**history (Declaration)**

How do you see the ideas in the Declaration compared to typical Medieval European?
*February 23, 2014*

**Help finding a good speech topic**

I am going to be giving an informative speech on a news article. The news article is suppose to be able to at least somewhat relate to college students and should also be about something new, interesting, or novel. Preferable something I could easily talk about for five ...
*February 19, 2014*

**Math**

If I picked a red checker from a bag of 9 black checkers and 6 red checkers, replacing it, and picking a red checker. What would the probability be of each set???
*February 18, 2014*

**Mathematics **

An rectangular area of 25 square meters, around an ancient historical site, is to be fenced to protect the artifacts. The sides with length x cost $ 34/ m and the other two sides cost $ 26 /m. a. Write an expression for the cost as a function of x. C(x) = b. The value of x for...
*February 17, 2014*

**the doctor**

That's what I had put at first but it marked it wrong. I don't understand.
*February 13, 2014*

**physics**

A)An object at rest has no forces acting on it. B)An object can be moving in one direction while the net force acting on it is in another direction. C)In order to move a massive crate sitting on the floor, the force you apply to the crate has to overcome the force of the crate...
*February 13, 2014*

**math**

Charice is painting the lines for her own basketball court. The free throw section will be a rectangle with a semi-circle on top. The length of the rectangle will be 2.25 metres greater than the width. Using 3.14 for mc004-1.jpg, the area of the court is 31.28 m2. Determine ...
*February 13, 2014*

**math**

A storage tank has a radius of x + 5 metres and a height of x metres. Determine the dimensions of the tank if the volume is 192ð m3? . Round your answers to two decimal places.
*February 13, 2014*

**math**

5/6 + 3/4 = 1/18 - 6c - 2/3 + 7c + 1/9 how do I get the answer?
*February 12, 2014*

**PHYSICS**

A 200g block slides back and forth on a frictionless surface between two springs, as shown. The left-hand spring has k = 130 N/m and its maximum compression is 16cm. The right-hand spring has k = 280 N/m. Find (a) the maximum compression of the right-hand spring and (b) the ...
*February 12, 2014*

**PHYSICS**

A roller coaster powered by a spring launcher follows a frictionless track as shown below. The roller coaster cart has a mass of 500 kg, and the spring launcher has a spring constant of 1500 N/m. d. What is the fastest speed the cart reaches anywhere on the track?
*February 12, 2014*

**physics**

A)Two boxes sit side-by-side on a smooth horizontal surface. The lighter box has a mass of 5.60 kg, the heavier box has a mass of 7.65 kg. Calculate the contact force between these boxes when a horizontal force of 4.83 N is applied to the light box. B)Calculate the contact ...
*February 12, 2014*

**PHYSICS**

A roller coaster powered by a spring launcher follows a frictionless track as shown below. The roller coaster cart has a mass of 500 kg, and the spring launcher has a spring constant of 1500 N/m. a. If the cart starts at a height h1 = 10m, how much must the spring be ...
*February 12, 2014*

**math**

The answer is no because pi doesn't have the exact value since it has many decimals, never ending.
*February 11, 2014*

**Algebra 1/ Pre**

Thank you sooo much!
*February 10, 2014*

**Algebra 1/ Pre **

Solve? 5x - 3(7x + 5) = 1
*February 10, 2014*

**Math**

Nevermind I got the answer
*February 10, 2014*

**Math**

We'll, this is the whole problem: Use substitution to solve for x and y: {5x - 3y =1 {7x - y = -5 The answer is suppose to be (-1,-2)
*February 10, 2014*

**Math**

How would you plug it into 5x - 3y = 1 Would it be: 5x - 3(-5 - 7x) = 1?
*February 10, 2014*

**Math**

Rearrange before substitution: 7x - y = -5 Would it be: -y= 5 - 7x?
*February 10, 2014*

**Math- urgent**

If slope= 4;(3,8) what would be the equation in point-slope form? Please show your work.
*February 5, 2014*

**physics**

Consider a swimmer who wants to swim directly across a river as shown in the figure below. If the speed of the current is 0.29 m/s and the swimmer's speed relative to the water is 0.64 m/s, how long will it take her to cross a river that is 14 m wide?
*February 4, 2014*

**Math 3rd grade**

A square garden is 12 feel long on each side.janet needs to put a post at each corner .she also needs to put a post every 3 feet on each side .how many post does janet need ?
*February 3, 2014*

**Science **

What are Antibiotics?
*February 3, 2014*

**Fast Way to Multiply Numbers ending in 0?**

Is there any trick to quickly multiply numbers ending in 0 - like 280 x 20?
*February 1, 2014*

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