Saturday

April 19, 2014

April 19, 2014

Total # Posts: 480

**Statistics**

A random sample of 47 students studied for an average of 7.1 hours last week. If the population standard deviation is 1.2 hours, what is the 90% confidence interval for the population mean?

**Physics**

a) A bullet (m = 0.0250 kg) is fired with a speed of 91.00 m/s and hits a block (M = 2.80 kg) supported by two light strings as shown, stopping quickly. Find the height to which the block rises. b)Find the angle (in degrees) through which the block rises, if the strings are 0....

**Physics**

Two children are playing a game in which they try to hit a small box on the floor with a marble fired from a spring-loaded gun that is mounted on a table. The target box is 3.46 m horizontally from the edge of the table. Bobby compresses the spring 0.97 cm, but the center of t...

**Physics**

Use the following information to calculate the speed of a ball in a pinball machine at a specific location. The ball is launched by using a spring (k = 703 N/m) compressed by 9.0 cm. Consider the starting position of the ball to be its location when the spring is compressed. H...

**Physics**

True or false Consider a simple frictionless roller-coaster. It begins at x = 0, at a height of y = H. Then it drops into a dip, reaching a minimum at x = 100, with zero height (y = 0). Finally, it goes back up at x = 200, but only reaches a height of y = H/2. Assume the rolle...

**life orientation**

Medicine (orthopedic surgery) 1. Numerous opportunities for continued education and connections. 2. Hands on career, always innovating and improving in technological advancements. Writing 1. Have an impact on society through the exploitation of beliefs. 2. Freedom to create ar...

**Physics**

A 3.3 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 103 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. a) What is its potential energy after it has swung to position B...

**Physics**

A bead of mass m = 33.5 kg is released from point A which is located 5 m above the ground and slides on a frictionless track. Determine the bead's speed when it reaches point C which is located 2.0 m above the ground.

**algebra 1**

how do you write this polynomial 5x3 + x5 − 8 + 4x in standard form?

**Chemistry**

Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid-fuel rocket motors. The reaction is the following. Cr2O3(s) + 2 Al(s) → 2 Cr(l) + Al2O3(s) What masses of chromium(III) oxide and aluminum must be use...

**Latin America/North America**

The alternative for America agreement of the early 2000s is primary aimed to

**psychology**

How do the experiences of children who feel anxiety or depression compare to those of adults who feel anxiety or depression? Explain your answers.

**math**

there are 2 times more cats than the number of dogs at a shelter.

**Math**

It is just an example.

**Math**

A proton has a size of 1.23x10^-11 and an electron has a size of 1.4x10^-8. How many times smaller is an electron than a proton? Show your work. If I divided 1.23x10^-11 and 1.4x10^-8, wouldn't 1.4x10^-8 be the numerator or the denominator? Please help!

**Math**

I thought the proton would have to be in the numerator and the electron would be in the denominator for you to divide?

**Math**

A proton has a size of 0.000000000123 and an electron has a size of 1.4x10^-8. How many times smaller is an electron than a proton? Show your work.

**Math**

Would I label it cm3 or..? I'm having trouble. :(

**Math**

For the number of bags I got 9. However I do not know how to label the number 125,664.

**Math**

Jim wants to plant pansies in his new planter. How much potting soil should Jim buy? Round to the nearest centimeter. Hint: The height is 100 cm and the diameter is 40 cm. My teacher said to use a specific formula. Out of that formula I got 125,664, but I do not know how to la...

**Math**

Huong covered a box with sticky-backed decorating paper. The paper costs $.03 per square inch. How much money will Huong need to spend on paper if the length is 7 inches, width is 3 inches, and the height is 9 inches? I thought Huong needed to spend $3.42 because I multiplied ...

**Math**

Huong covered a box with sticky-backed decorating paper. The paper costs $.03 per square inch. How much money will Huong need to spend on paper if the height of the box is 9 inches, width is 3 inches, and the length is 7 inches? Please show full work. Thank you.

**social studies (history)**

In what ways did the movement of people and technology into and within the Great Plains effect the United States and its residents?

**physics**

Two soccer players start from rest, 32 m apart. They run directly toward each other, both players accelerating. The first player’s acceleration has a magnitude of 0.55 m/s2. The second player’s acceleration has a magnitude of 0.40 m/s2. (a) How much time passes befor...

**math**

Suppose there are 100 rabbits on an island and that the rabbit population can triple every half-year. Write an equation you could use to find the number of rabbits, R, after t, years. Using your equation, determine the amount of rabbits on the island in year 10. For the equati...

**Physics**

A cyclist maintains a constant velocity of 5.2 m/s headed away from point A. At some initial time, the cyclist is 251 m from point A. What will be his displacement from his starting position after 85 s? Answer in units of m What will be his position from point A after that time?

**Social Studies (History)**

What are some short-term causes (if any) of the transcontinental railroad?

**Social Studies**

Oops, sorry wrong one.. That was supposed to be on a different question.

**Social Studies**

My bad, I haven't read the website carefully enough to see how much materials and tools they need to construct the railroad. I apologize.

**Social Studies (History)**

1) What are the materials the workers used to construct the first transcontinental railroad? 2) What are the materials in the railroad? 3) What are the long-term and short-term causes of the transcontinental railroad (if there are any short-term causes)? I WILL APPRECIATE YOUR...

**Social Studies (History)**

The website you provided me was not very informational on the materials.

**Social Studies (History)**

Were the materials spikes and wood for both Union and Central Pacific railroads to construct the transcontinental railroad?

**Social Studies (History)**

What were the materials to construct the transcontinental railroad? I already knew the railroad was mostly constructed by hand by thousands of workers, but i need help to find out what kind of materials they used to build and construct the railroad. Also, what are the material...

**ELA**

how would you use the word generate in a sentence? i'm confused on how to put it in a sentence. I know that generate means cause (something, esp. an emotion or situation) to arise or come about.

**ela**

what does it mean to: How do those specific word choices and tone contribute to the meaning?

**english (ELA)**

what is another word for "spill"

**Math**

(( cube square root of 7)^1/2)^3

**chemistry**

Polycarbonate plastic has a density of 12 g/cm3. A photo frame is contructed feom two 3 I n sheets of polycarbonate. Each sheet measures 28 cm by 22 cm. What is the mass of the photo frame

**algebra**

x-6y+32=1 3x-3y+32=-1

**math**

a student earned a grade of 80% on a math test that had 20 problems. How many problems on this test did the student answer correctly?

**calculus**

two forces f1 and f2 acting on an object at a 90 degree angle will pull the object with a reluctant force, R, at an angle between f1 and f2. R= ã f1^2+f2^2 R=15 and f1=9 find f2

**math**

The length of a table is 4m longer than the width. The are is 77m^2. Find the dimensions of the table. l=w+4 w=l-4? I'm stuck?

**math**

Two cars leave at the same time from towns that are 460 miles apart and travel toward each other. They meet after 4 hours. Find the rate of each car if one car travels 13 miles per hour faster than the other.

**math**

Kuai, you are awesome!!! Thank you very much! I really appreciate it!

**math**

An 80% acid solution is to be mixed with a 30% solution to get 90 gallons of a 50% solution. How many gallons of each solution are needed?

**math**

Thank you, Kuai!!!

**math**

Wendy invested $6500.00 into two bank accounts, one paying 4% simple interest and the other paying 6%. If her annual interest from the two accounts is $344, how much did she invest at 6%?

**math**

(x^-3y/x^2)^-3

**math**

no solution 12 does not = 5

**math**

x=2 y=-3

**math**

Much appreciated!!!

**math**

Let f(x)=9x^2+6x-8, find f(-7)

**math**

Thank you Steve!

**math**

f(x)=-7/x-9 What number must be excluded from the domain and why?

**math**

Thank you Reiny!

**math**

Ellen wishes to mix candy worth $1.64 per pound with candy worth $3.46 per pound to form 20 pounds of mixture worth $3.00 per pound. How many pounds of the more expensive candy should she use?

**chemistry**

Determine the gram molecular weight of 3.5 moles of H2O2

**math**

Any chance you gals would like to go to class with me tomorrow evening? It's 6:00-9:45 pm eastern time in Richmond, IN? Thank you very much for the assistance, I really do appreciate it more than you know.

**math**

I would love to try that, but I have no idea where to begin. I don't have class until tomorrow night, so I cannot ask my instructor. I am not trying to be selfish with the help I've received from this site. I am grateful and I genuinely need help.

**math**

And I am very appreciative of the help I've gotten so far. I sincerely am. I am unsure how to set up this problem?

**math**

Walnuts sell for $10 per pound and pecans for $18 per pound. How much of each type of nut would produce 40 pounds of a mix that sells for $15 per pound?

**math**

Excellent! Thank you Kuai!

**math**

Children's tickets to a movie cost $7. Adult tickets cost $12. If 275 tickets were sold for a total of $2490.00, how many of each type were sold?

**math**

y+3x^2=2 f(x)= f(4)=

**math**

My bad...

**math**

Children's tickets to a movie cost $7.00. Adult tickets cost $12.00. If 1275 tickets were sold for a total of $2490.00, how many of each type were sold?

**math**

Thank you, Sue! That's awesome!

**math**

The difference between two numbers is 36. The sum of these two numbers is 62. Find the numbers.

**math**

Thank you Kuai!

**math**

A 10% acid solution is to be mixed with a 50% solution to get 200 liters of a 20% solution. How many liters of each solution should be used?

**Algebra**

6x^7-3x^3+2x^7+8x^3=

**Art**

What about bats, and water? I've seen water in caves.

**Algebra**

(8x^(2)-4x-29)+(9x^(2)+7x)=

**eng225**

Satire?

**Algebra**

Identify the solution(s) of the system of equations 3x-2y=6 5x=5-25y

**Algebra**

Identify the solution(s) of the system of equations 9x + 2y = 6 8x - 2y = 8

**Algebra**

Identify the solution(s) of the system of equations 3x+2y=4 5x-4y=3

**Chemistry**

A solution contains 80.0 g of sodium chloride and 400.0 g of water. Calculate the NaCl as a mass percentage

**chemistry**

Physicain elects to re-hydrate the patient br intravenous(IV) administration of 2.0 L of 0.45% (w/v) of NaCl. 0.45%9w/v) = 0.45g/100ml A.How many grams of NaCl were given? B.How many moles of Nacl were given? C.What is the molarity of the NaCl solution?

**english**

what keeps the "you" company in the poem The Journey by Mary Oliver?

**L.O**

1. identify and describe 3 environmental health hazards that cause ill health,crises, and/or disasters within your community or any other community withing SA and globally. Include evidence that is current of the identified issues, use graphs, statistics, pictures,etc. 2. Crit...

**physics **

A 57.0 kg diver dives from a height of 15.0 m. She reaches a speed of 14.0 m/s just before entering the water. (a) What was the average force of air resistance (e.g., friction) acting on the diver. (b) What is the force of friction underwater if she reaches a depth of 2.5 m be...

**physics **

A 57.0 kg diver dives from a height of 15.0 m. She reaches a speed of 14.0 m/s just before entering the water. (a) What was the average force of air resistance (e.g., friction) acting on the diver. (b) What is the force of friction underwater if she reaches a depth of 2.5 m be...

**Math**

Find the dimensions of a rectangular cover plate if its length is 8 inches longer than its width if its parameter is 60 inches(Hint:P=2L=2W)

**Psy202**

After hearing about some possible causes of sneezing, a scientist decides that room fresheners are the most common cause. What is the term that describes the scientist thinking

**Math--Algebra**

What is the answer to the riddle: why does the us mint need a new building?

**Data Mangement- Math**

The diagram represents the computer network between the department offices in a high school. The network can send data from one computer to another using any number of intermediate connections, but the data can pass through each connection only once. How many routes are there ...

**English 225**

Which of the following editing techniques helps keep screen direction constant?

**Math**

Sandra used a triangular prism 10 cm long to refract light into the spectrum. Each triangular end had an area of 3.5 cm squared and sides 3 cm, 3 cm and 2.6 cm. What was the surface of the prism?

**Math**

Express as a function of two variables. An open box is to contain a volume of 12 cubic meters. Given that the material for the sides of the box costs $2 per square meter and the material for the bottom costs $4 per square meter, express the total cost C of the box as a functio...

**physics**

If u type this question in to the google it will give u the answer which agrees with your text book

**chemistry**

If you made up a solution of NaOH by adding 0.010 mole of solid NaOH to 1.0 liter of distilled water, what would be the pH of the solution?

**Math**

find the actual rational zeroes for f(x)=4x^3-16x+17x-5

**math**

What is the value of x if the perimeter of a rectangle is 38cm.?

**Chemistry**

A 7.83 g sample of NaCl is dissolved in 90.00 mL of ethyl alcohol solution. Calculate the molar concentration of the solution.

**Chemistry**

That's what i was going over an was thinking that was the answer.

**Chemistry**

The combustion of 1 mole of CO according to the reaction CO(g) + ½O2(g) → CO2(g) + 67.6 kcal gives off how much heat?

**precalculus i dont understan this hw**

for you its easy because you understand it !

**precalculus i dont understan this hw**

How to prove sec x - tanx sinx= cosx

**I NEED HELP ASAP**

how to prove cos^2A(1+tan^2 A)=1

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