Saturday

January 31, 2015

January 31, 2015

Total # Posts: 2,875

**Chemistry**

If you dissolve 13.5 g of malic acid, C4H6O5, in half a liter of water (0.500 L), what is the molarity of the acid in the solution?
*May 4, 2014*

**Accounting Questions**

Ugh. This class. Does anyone have the answers?
*May 3, 2014*

**chem**

calculate the density of each of the following gases: a)NH3 at 25 Degrees Celsius and 1.2 atm b)Ar at 75 Degrees Celsius and 745 torr
*April 29, 2014*

**college chem**

A mixture contains H2 at 600 torr pressure, N2 at 200 torr pressure and O2 at 300 pressure. what is the total pressure of the gases in the system?
*April 29, 2014*

**Engineering**

Three resistors , 50 ohms, 100 ohms, and r3 are connected in a series to a power source with potential difference 48 volts and a current throughout the circuit. Can anyone help me figure out what r3 is ?
*April 29, 2014*

**college chem**

A sample of O2 gas was collected over water at 23 degrees celsius and 772 torr. what is the partial pressure of the O2?
*April 29, 2014*

**college chem**

a sample of a gas occupies a volume of 1025 mL at 75 degrees Celsius and 0.75 atm. What will be the new volume if temperature decreases to 35 degrees Celsius and pressure increases to 1.25 atm
*April 29, 2014*

**college chem**

A sample of methane gas CH4, occupies a volume (L) of 58.2 L at a pressure of 7.25 atm. What volume will the gas occupy if the pressure is lowered to 2.03 atm
*April 29, 2014*

**pipe fitter test certification**

Please Help!...I am in need of a study guide for my pipefitters test, or an outline of what's on the test. Unfortunately I am not able to take the class available. PLEASE if you know of one or where one would be available. Any information will be greatly appreciated and a ...
*April 28, 2014*

**Chemistry**

What is the specific heat of an unknown substance if a 2.45g samples releases 12.9 cal as its temperature changes from 25.1 degrees C to 20.1 degrees C?
*April 27, 2014*

**Language Arts**

That is correct
*April 21, 2014*

**HELP!**

Need some help with the 6:3:1 ratio question. Don't understand.
*April 14, 2014*

**math**

Houston Community College is planning to construct a rectangular parking lot on land bordered on one side by a highway. The plan is to use 640 ft of fencing to fence off the other three sides. What should the dimensions of the lot be if the enclosed area is to be a maximum?
*April 14, 2014*

**Chemistry help plzzzzz!!!!! **

I've tried solving this problem 100x and i keep getting it wrong. I dont know where i am going wrong. Wouldnt it be: (100ml * 4.180 * 6.49) + (6.50*6.49) 2713+42.2=2755.2= 2755.2/0.05=55104 Then convert to kj so 55104/1000=55.104 which would be 55.1 for correct sig digits...
*April 10, 2014*

**Spanish 101**

Choose the logical word or words to complete each sentence. 1. A mis hermanos y a mí nos____ aprender verbos nuevos. 1 encanta 2 encantamos 3 encanto 4 encantan I chose answer 2 ecantamos 2. A mi papá ____ molestan los niños traviesos. 1 los 2 me 3 se 4 le...
*April 2, 2014*

**Math**

Thank you so much for the help!
*April 2, 2014*

**Math**

This problem from China is almost 2000 years old: Find a number that when divided by 3 gives a remainder of 2, when divided by 5 gives a remainder of 3, and when divided by 7 gives a remainder of 4.
*April 2, 2014*

**math**

Use each clue to find a three digit number
*March 31, 2014*

**statistics**

In a statistics class of 45 students, 12 have a strong intrest in statistics. If two students are selected at random from this class, what is the propability that both of them have a strong interest in statisitcs?
*March 31, 2014*

**algebra 1**

Does anyone know this question?
*March 20, 2014*

**CHEMISTRY**

An electron undergoes a transition from an n=3 to an n=1 stationary state and red light is released. Which of the following forms of electromagnetic radiation could be released for an n=2 to n=1 electron transition within the same atom? -blue visible light -yellow visible ...
*March 20, 2014*

**physical science**

Green light has a frequency of about 5.3Hz~10Green light has a frequency of about 5.3Hz~ 10^{14}. Using the relationship speed of light (c)=fƒÉ find its wavelength in air.
*March 17, 2014*

**physics**

In I2 you halfed the radius of the flat disk as if it were a diameter like pottery wheel. it's not 0.065 it's 0.13
*March 17, 2014*

**Science**

b I had the same question
*March 16, 2014*

**algebra**

What is the slope of the line 4x + 6y = 12
*March 13, 2014*

**Math **

jared's football team lost a total of 12 yards during 4 plays of the game. They lost the same number of yards during each of the plays. What is an integer to represent it?
*March 11, 2014*

**Math**

A MP3 player is marked up by 10% and then marked down by 10% what is the final price?
*March 5, 2014*

**Science**

What is true about X-rays and microwaves? (1 point) a. X-rays have greater speed than microwaves. b. X-rays have greater amplitude than microwaves. c. X-rays have greater frequency than microwaves. d. X-rays have greater wavelength than microwaves.
*March 5, 2014*

**Science**

I think it's a. X-rays
*March 5, 2014*

**Science**

2. Which waves have the longest wavelength and lowest energy on the electromagnetic spectrum? (1 point) a. X-rays b. infrared c. radio waves d. gamma rays
*March 5, 2014*

**Science**

Is there any way I can attach the picture?
*March 5, 2014*

**Science**

1. Compare the two light waves above. Which wave would produce the brightest light and which wave would have the least energy? (1 point) a. wave A; wave A b. wave A; wave B c. wave B; wave A d. wave B; wave B Is it C?
*March 5, 2014*

**Math 30-2**

There are 7 different books on a shelf. How many selections of more than 4 books can be made?
*February 28, 2014*

**Stats**

In 1898 L. J. Bortkiewicz published a book entitled The Law of Small Numbers. He used data collected over 20 years to show that the number of soldiers killed by horse kicks each year in each corps in the Prussian cavalry followed a Poisson distribution with a mean of 0.63. (a...
*February 25, 2014*

**Stats**

The number of failures of a testing instrument from contamination particles on the product is a Poisson random variable with a mean of 0.028 failure per hour. (a) What is the probability that the instrument does not fail in an 8-hour shift? (b) What is the probability of at ...
*February 25, 2014*

**math**

$155.5 how I found it: I tried to find what an amount for which to total amount of tax cost $9.33 so, I chose random numbers to test this, 155.5x.06=9.33
*February 25, 2014*

**Statistics**

Astronomers treat the number of stars in a given volume of space as a Poisson random variable. The density in the Milky Way Galaxy in the vicinity of our solar system is one star per 16 cubic light years. (a) What is the probability of three or more stars in 16 cubic light ...
*February 20, 2014*

**Statistics**

An electronic product contains 32 integrated circuits. The probability that any integrated circuit is defective is 0.02, and the integrated circuits are independent. The product operates only if there are no defective integrated circuits. What is the probability that the ...
*February 20, 2014*

**maths**

my number is less than 100 one more than a multiple of 3 one of its digits is prime if you reverse its digits you get a prime it has exactly four factors the sum of digits is prime if you miltiply it by 5 it is greater than 100
*February 19, 2014*

**Math**

a^2+b^2=c^2 a=24 b=25 c= squareroot(24^2+25^2)=34.6554469
*February 18, 2014*

**math**

Thank you
*February 18, 2014*

**math**

how did you get .1?
*February 18, 2014*

**math**

The probability that Jack plays guitar on a raining day is 0.6 and on a sunny day is 0.5. The probability that is rains tomorrow is 0.8. Find the probability that Jack will not play guitar tomorrow? Is it 32%?
*February 18, 2014*

**algebra 2**

X^2-4x-3.5=0 x=(-b+ or - squareroot(b^2-4ac))/2a x= (4+ or - squareroot((-4)^2-4(1)(-3.5)))/2 x=(4+ squareroot(30))/2 x=(4- squareroot(30))/2 x=4.738612788 x=-.7386127875
*February 18, 2014*

**algebra2**

4(x-1)(x-1)+3 4(x^2-2x+1)+3 4x^2-8x+4+3 4x^2-8x+7
*February 18, 2014*

**Statistics**

Disk of ploycarbonate plastic form a supplier are anaylzed for scratcha nd shock resistance. the results from 100 disks are summarized below: Shock Resistance high low Scratch high 70 9 resistance low 16 5 Let A denote the even that a disk has high shock resistance, and let B ...
*February 18, 2014*

**Statistics**

The probability that Jack plays guitar on a raining day is 0.6 and on a sunny day is 0.5. The probability that is rains tomorrow is 0.8. Find the probability that Jack will not play guitar tomorrow? Is it 32%?
*February 18, 2014*

**math**

sophie ruth is eating a 50 gram chocolate bar which is labled 30 % cocoa how many grams of chocolate are in the chocolate bar
*February 18, 2014*

**Math**

Thank you
*February 16, 2014*

**Math**

Each person in Sharae's family of 5 eats 3 bowls of cereal each week. Her mother is going grocery shopping and wants to know how many bowls of cereal they will eat over the next 4 weeks. Write and solve an equation to find how many bowls of cereal the family will eat? Use ...
*February 16, 2014*

**physics**

A rocket moves upward, starting from rest with an acceleration of 26.3 m/s2 for 3.91 s. It runs out of fuel at the end of the 3.91 s but does not stop. How high does it rise above the ground?
*February 12, 2014*

**Math**

The combined math and verbal scores for students taking a national standardized examination for college admission, is normally distributed with a mean of 620 and a standard deviation of 220. If a college requires a student to be in the top 10 % of students taking this test, ...
*February 9, 2014*

**Stats**

Determine the following random variables discrete or continuous: a)Number of fish I caught during 2 hours? I said: discrete b)Temperature of a coffee cup? I said: continuous c)Height of a 2-year-old maple tree? I said: continuous d) Number of credit cards I have in my wallet? ...
*February 8, 2014*

**Stats**

The probability that Jack plays guitar on a raining day is 0.6 and on a sunny day is 0.5. The probability that is rains tomorrow is 0.8. Find the probability that Jack will not play guitar tomorrow.
*February 8, 2014*

**Stats**

Thank you
*February 8, 2014*

**Stats**

How many ways to choose 2 boys and 3 girls from a class of 10 boys and 15 girls? Would you do: 10C2=45 15C3=455 (45)(455)=20,475?
*February 8, 2014*

**computer programming**

Are you a beginner?
*February 7, 2014*

**calculus**

Evaluate the limit as x approaches 0 of [tan(x+Δx)-tan(x)] /Δx: sec^ 2 (x) cot (x) sec (x) does not exist
*February 6, 2014*

**calculus**

Suppose f (1) = 2, f ΄(1) = 3, g(1) = 5, and g΄(1) = -4. Evaluate (f g)΄v at x = 1. Answer -12 7 10 23
*February 6, 2014*

**calculus**

It is known that x 2 + 4x ≤ f(x) ≤ -x 2 -4x the interval [-4, 0]. Use the Squeeze Theorem to evaluate the limit as x approaches negative 2 of f of x. -4 0 4 Squeeze Theorem does not apply
*February 5, 2014*

**calculus**

Suppose f of x equals 3 times x minus k when x is less than 5 and equals 1 plus k times x when x is greater than or equal to 5.Find the value of k that would make f continuous at x = 5. -3 0 7/3 no such k will make f continuous
*February 5, 2014*

**calculus**

At a constant temperature, the pressure, P, and volume, V, of a trapped gas have the relationship P equals the quotient of k divided by V , where k is some positive constant. What occurs if the volume is compressed such that V → 0+? The pressure increases without bound. ...
*February 5, 2014*

**physics**

Two boxes are connected by a cord running over a pulley as shown in the picture below. Box I of mass 8.0 kg is on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg. What is the tension in the cord? 35 N ...
*February 5, 2014*

**physics**

As a rock of mass 3.0 kg drops from the edge of a 60. meter high cliff, it experiences air resistance, whose average strength during the fall is 22. N. At what speed will the rock hit the ground? Answer 1.5 m/s 13 m/s 18 m/s 26 m/s 34 m/s
*February 5, 2014*

**physics**

A 15.0-kg box is released from rest on a rough inclined plane tilted at an angle of 45° to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200. What is the force of kinetic friction on the box? Answer Fifteen square root of ...
*February 5, 2014*

**physics**

A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 30° above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box? Square root of three meters per second squared. Four square ...
*February 5, 2014*

**physics**

A constant force of 900 N pushes a 100 kg mass up the inclined plane shown above at a uniform speed of 5 m/s. ( hight= 1m) The power developed by the 900 N force is most nearly: 400 W 800 W 900 W 1000 W 4500 W
*February 4, 2014*

**physics**

The cart of mass 10 kg shown above moves without frictional loss on a level table. A 30 N force pulls on the cart horizontally to the right. At the same time, a 10 N force at an angle of 60° above the horizontal pulls on the cart to the left. What is the magnitude of the ...
*February 4, 2014*

**physics**

The two blocks of masses M and 2M shown above initially travel at the same speed v but in opposite directions. They collide and stick together. What is the final velocity of the mass M after the collision? negative one sixth v. negative one third v. Zero one sixth v. one third...
*February 4, 2014*

**physics**

The figure above shows an object of mass 0.5 kg that is suspended from a scale and submerged in a liquid. If the reading on the scale is 4 N, then the buoyant force that the fluid exerts on the object is most nearly: 1.3 N 1.0 N 0.75 N 0.33 N 0.25 N
*February 4, 2014*

**physics**

For which of the following motions of an object must the acceleration always be zero? I. Any motion in a straight line II. Any free fall motion III. Any motion in a circle it can be more than one :P
*February 4, 2014*

**math**

I dont think this answer is correct because 3*42=126 than + 42 = 168 not 164
*February 4, 2014*

**chemistry**

What physical properties of calcium chloride, citric acid, sodium iodide, potassium iodide, and sucrose have in common?
*February 3, 2014*

**English**

How do you write a narrative essay about something you regret doing when you have no regrets? lmao
*February 3, 2014*

**Global Studies (check please)**

The belief, shared by many Americans, that the United States had a right to own all the land from the Atlantic to the Pacific was called a. America's Right ***** b. Manifest Destiny c. The Inheritance d. Free Will Which of the following was neither part of the Confederacy ...
*February 3, 2014*

**Global Studies (Please help)**

I just have the same question and i need the answer, i am stuck
*February 3, 2014*

**Global Studies (Please help)**

So its colorado
*February 3, 2014*

**Global Studies (Please help)**

I dont know:/
*February 3, 2014*

**math**

5/3z-4 = -2/1-2z (solve the proportion)
*January 28, 2014*

**math**

152
*January 28, 2014*

**math**

8/x+4 = 12/5x - 13 (solve the proportion)
*January 28, 2014*

**math**

on monday biologists tagged 100 sunfish from a lake.on friday the biologists counted 12 tagged fish out of a sample of 400 sunfish from the same lake.estimate the total number of sunfish in the lake
*January 28, 2014*

**math**

write an equation in function form. (y=mx + b) 1.7x - y = 7 2.15x + 3y + 2 = 9x + 14
*January 28, 2014*

**math**

On a class trip there wre 30 more girls than boys.The total number of students on the trip was 210.Write and solve an equation to find the number of girls and the number of boys on the class trip.
*January 28, 2014*

**math**

A new plasma screen tv cost $4600.A family makes a down payment of $136 and pays off the balance in 36 equal monthly payments.Write an equation to find the monthly payment.
*January 28, 2014*

**math**

Miguel is a cartoonist. Miguel drew 2 cartoon cells in 3 hours. If he keeps drawing at the same rate, about how many cells will he draw in 9 hours?
*January 28, 2014*

**chemistry**

if you dissolve 20mg of alcl3 into 2.0 of a 2.5 molal nacl solution (density 1.08kg/l), what would be the mass concentration (ppm(weight)) of al3+ in the resulting solution?
*January 26, 2014*

**Fractions**

(2/4)= 1/2 8 red barrettes = 1/2 of Julias collection since half of Julia's barrettes are red, and she has 8 red barrettes you multiply 8*2 to get 16 (2 or (2/1) is the inverse fraction of (1/2)) to double check your answer.. 16*(2/4)
*January 26, 2014*

**science/writing **

How are stink bugs harmful to crops?
*January 16, 2014*

**add maths**

A function f is defined by f:x→1-2x.Obtain expressions in the same form for f^3.
*January 13, 2014*

**add maths**

Two functions f and g are defined by f:x→3x+2 and g:x→x^2-2.Obtain expressions for fg and gf.Find the value(s) of x for which f=g? fg=gf?
*January 13, 2014*

**maths**

The production of natural rubber in Malaysia in July 2004 was 108315 tonnes,a rise of 4.9% compared to the previous month.Calculate the production of natural rubber in June 2004 in kg.Give your answer in standard form,correct to 4 significant figures.
*January 12, 2014*

**add maths**

Function of g is g:x→x-1 over x+2,x not equal to -2. Find g^2
*January 12, 2014*

**maths**

The scale of a map is 1:25000.Find the actual length of a road,in cm,which is measured 7.8 cm on the map.Express the answer in standard form.
*January 11, 2014*

**maths**

Yeah..same as my answer sheet !thanks:)
*January 11, 2014*

**maths**

The total population of the earth was estimated to be 6.42 billion people.Given that the total land surface area of the earth is about 1.5×10^8km^2.Find the average number of people living in 1 km^2 of land on earth,correct to 2 significant figures.Thanks a lot for ...
*January 11, 2014*

**maths**

Ohh..i got it..divide two..thanks a lot!
*January 11, 2014*

**maths**

Steve,how to get 4.9?
*January 11, 2014*

**maths**

A large pipe has a diameter of 9.8×10^2cm.Water flows in the pipe at a speed of 5m s^-1.Find the volume in m^3,of water that flows out from the pipe every second,correct to 2 significant fogures.[Take pai as 3.142]
*January 11, 2014*

**writing thesis statments**

I am stuck on what would be a good thesis statement for my topic of, " How does drug addiction affect America as a whole?
*January 11, 2014*

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