Thursday

August 21, 2014

August 21, 2014

Total # Posts: 1,912

**Chemistry**

Consider the equilibrium 2NO (g) <---> 2NO (g) + Cl2 (g). In a 1 L container @ equilibrium there are 1.0 mol NOCL, 0.70 mol NO, and 0.40 mol Cl2. @ constant temperature and volume, 0.10 mol NaCl is added. What are the concentrations in the "new" equilibrium in ...
*April 12, 2013*

**math**

1600
*April 11, 2013*

**physics**

The GoodYear blimp is kept aloft by helium gas which fills a volume of 4559m^3. It can carry a maximum load of 1176kg. How much more mass could the blimp carry if it were filled with hydrogen? Take the density of helium gas to be 0.160kg/m^3 and that of hydrogen to be 0.081kg/m^3
*April 10, 2013*

**Probabilities**

In a cookie jar, there are 6 chocolate cookies and 8 oatmeal cookies. I take out the cookies one at a time and proceed to eat them. The probability that the 7th cookie that I eat is a chocolate cookie is a/b, where a and b are positive coprime integers. What is the value of a+b?
*April 9, 2013*

**Math**

Bought 3 shirts & 2 pair pants for $85 and my friend bought 2 shirts & 5 pants for $130, and the shirts are the same price, what is the price of each shirt?
*April 8, 2013*

**Physics**

1a)if accelerating voltage is doubled in a CRT the deflection will change from "d" to ____? b) if magnetic field strength is doubled, deflection in a CRT will change from "d" to ___?
*April 7, 2013*

**Probabilities**

A group of 5 people are going to meet weekly at the library for 4 weeks. Each week, two people are selected at random to speak. Each person may speak in multiple weeks, but no pair of people will speak together more than once. The probability that there is a person who will ...
*April 1, 2013*

**Combinations**

Anna was opening a new restaurant, so she went to the sign store to get letters to make a sign to hang above the storefront. When she got to the sign store, the only letters they had in stock were two copies of the letter 'X,' two copies of the letter 'E,' and ...
*April 1, 2013*

**Probabilities**

A bag contains 150 balls numbered 1 through 150 . Three balls are drawn and placed on the table. The probability that the balls were drawn in increasing order can be expressed as a/b where a and are coprime positive integers. What is the value of a+b
*April 1, 2013*

**quiz**

We are given 7 squares of side lengths 1, 2, 2, 2, 3, 4, 5. They can be fitted to form a rectangle, with no overlap or gaps in-between. What is the perimeter of the rectangle?
*April 1, 2013*

**Maths**

Let f(x)=x^2 -1 . How many distinct real roots are there to f(f(f(x)))
*April 1, 2013*

**quiz**

The vertices of a cube are labeled with the numbers 0,1,2,3,4,5,6 and 7, such that no two vertices are labeled with the same number. The sum of any 2 numbers on an edge is prime. What is the maximum sum of the 4 numbers on a face?
*April 1, 2013*

**Math**

What is the answer to the equation (0.3.)²-(0.2)²•(0.5)?
*March 31, 2013*

**Trig**

Use a half-angle identity to find the exact value for sec(x/2) if sinx = -12/13 ; 3pi/2 < x < 2pi
*March 28, 2013*

**algebra**

Determine whether the following is a polynomial. 937g2h3 - 238gh2 + 54gh
*March 28, 2013*

**algebra**

The following polynomial is prime. 2q² + 9q + 1
*March 28, 2013*

**PHYSICS - formula?**

Here is one of my questions from my physics study. It tells me the answer (35 J), but how do I find that answer? I would appreciate a formula or step by step calculation. Thanks! :) A 30 kg kid on rollerskates is moving 1 m/s. His brother pushes him with a force of 5 N. What ...
*March 26, 2013*

**Life orientation**

1. Pollution - comes from factories, cars, etc. Think... try looking in your lesson or book and see if they gave examples of environmental hazards.
*March 26, 2013*

**science**

Those blue crystals are copper sulfate crystals with the formula CuSO4*5H20. It has
*March 26, 2013*

**science**

formula: CuSO4*5H20
*March 26, 2013*

**economics**

Yes, only you can answer. But just think, did you ever buy something because you saw it on tv? Or maybe you were on the computer and an ad popped up for a new video game that is coming out in stores soon. Maybe some new invention/product was featured in the newspaper. Do any ...
*March 26, 2013*

**Psychology **

How do I find reliable sites for a research project, when I can't use journal articles published online, or personal websites?
*March 23, 2013*

**Math **

Find the area of a circular segment of a circle of radius 7cm that sub tends a central angle of 35 degrees?
*March 22, 2013*

**CHEMISTRY**

How do you get the concentration with buret readings? What would the concentration of HC2H3O2 (M) be? For example, Molarity of the NaOH solution: 0.2619 M Final buret reading: 31.10 ml Initial buret reading: 0 Volume of NaOH solution: 31.0 ml concentration of HC2H3O2 (M...
*March 20, 2013*

**Maths**

498
*March 20, 2013*

**Maths**

What is the highest power of 3 that divides 1000! (1000 factorial)
*March 20, 2013*

**Cultural Anthrolpogy**

Anthropological research has demonstrated that supernatural beings and forces exist in what percentage of the world's cultures? A. 50 percent B. 80 percent C. 95 percent D. 100 percent My answer: C
*March 18, 2013*

**Cultural Anthropology**

Ms Sue, are my answers correct pls? Thanks.
*March 18, 2013*

**Cultural Anthropology**

Sorry. That is a sodality member. Also: Supernatural connections to political leadership are most closely associated with: A. bands. B. tribes. C. chiefdoms. D. states. I chose C. 2/ It is often difficult to identify who the leader is in a foraging society because: A. you can...
*March 18, 2013*

**Cultural Anthropology**

Hello Ms Sue. How are you? I am actually reading now. However, I am more leaning to A. Is this correct? Thank you. Anna
*March 18, 2013*

**Cultural Anthropology**

In a band society, who would most likely be responsible for punishing a murderer
*March 18, 2013*

**english **

hey everybody!I will make a presentation in the class few days later.Anyone watched The others(2001)?I got a question.Who is the woman in distress in the film and why is she in distress? thanks..
*March 15, 2013*

**PHYSICS**

The answer is 24696 J.
*March 14, 2013*

**PHYSICS**

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with this. All I need is a formula, please. :)Thank you! Here it is: A skier with a mass of 60.0 kg pushes...
*March 14, 2013*

**physics**

At a fabrication plant, a hot metal forging has a mass of 74 kg and a specific heat capacity of 430 J/(kg·C°). To harden it, the forging is quenched by immersion in 710 kg of oil that has a temperature of 32°C and a specific heat capacity of 3000 J/(kg·C&...
*March 13, 2013*

**Physics**

At a fabrication plant, a hot metal forging has a mass of 74 kg and a specific heat capacity of 430 J/(kg·C°). To harden it, the forging is quenched by immersion in 710 kg of oil that has a temperature of 32°C and a specific heat capacity of 3000 J/(kg·C&...
*March 13, 2013*

**Physics **

A rod made from a particular alloy is heated from 22.0°C to the boiling point of water. Its length increases by 8.15 10-4m. The rod is then cooled from 22.0°C to the freezing point of water. By how much does the rod shrink?
*March 13, 2013*

**Math**

How many degrees,in total,does the minute hand turn in one day ?
*March 12, 2013*

**Maths**

A tyre manufacturer has chosen 48 tyres at random from a production line and issued them to taxis for testing. Assume that the 48 numbers you have selected refer to the number of thousands of kilometres travelled during the life of each tyre. (For example, a value of ‘32...
*March 12, 2013*

**CHEMISTRY HELP!!**

When BaCl2 reacts with Na3PO4, Ba3(PO4)2 and NaCl are formed. Balance the equation and write the coefficients in the blanks.
*March 12, 2013*

**chemistry**

61.54 g
*March 9, 2013*

**Chemisty**

Fluorine gas can react with ammonia gas to produce dinitrogen tetrafluoride gas and hydrogen fluoride gas. This reaction is described by the following balanced equation: 5 F2 (g) + 2 NH3 (g) N2F4 (g) + 6 HF (g) What mass of hydrogen fluoride gas is produced from 135 g of ...
*March 8, 2013*

**Check my physics**

Would you mind checking one of my problems from my physics study guide? I know the answer and just want to make sure I am using the right formula. :) A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground. a. Determine the kinetic energy possessed by ...
*March 7, 2013*

**PHYSICS**

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #8: A 20 kg block of ice slides without friction down a long hill. The start ...
*March 7, 2013*

**PHYSICS**

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #7: A 30 kg ball is launched at an angle of 15 degrees and is moving 20 m/s ...
*March 7, 2013*

**PHYSICS**

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #6: A 30 kg kid on rollerskates is moving 1 m/s. His brother pushes him with a...
*March 7, 2013*

**PHYSICS**

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #5: A roller coaster car starts at Point A at a height of 100 m. When it ...
*March 7, 2013*

**PHYSICS**

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #4: What is the increase in thermal energy to a 2000 kg bus and its ...
*March 7, 2013*

**PHYSICS**

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #3: A 30 kg kid on rollerskates is being pushed by his mom with a force of 10 ...
*March 7, 2013*

**PHYSICS**

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #2: Suppose the spring in a pinball machine has a spring contant of k=400 N/m...
*March 7, 2013*

**PHYSICS**

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #1: A skier with a mass of 60.0 kg is standing at the top of a snow covered ...
*March 7, 2013*

**Exam: 986109RR - CHOOSING YOUR BUSINESS**

Um, the point of this website is not to give out ABCD answers. It's to help guide you. But we can't even help you do that since you posted so many answers. Sorry, can't help.
*March 7, 2013*

**algebra**

If the equation were x= 0.03x - 58.91, x would equal -60.7320.
*March 7, 2013*

**algebra**

What are you asking?
*March 7, 2013*

**Cultural Anthrolpogy**

The field of computer technology could be used to illustrate that culture is
*March 6, 2013*

**Physics**

For launching a satellite into orbit around earth, would the proper conservation of energy formula be: Epi + Eki + O work = Epf + Ekf? Would work = 0 for launching a satellite? And, would Epi = -Gm1m2/radius of earth or would it just equal 0 (because we usually set Ep on earth...
*February 28, 2013*

**Chem**

Calculate the pH of a .50 M solution of NaCl.
*February 27, 2013*

**Physics**

The electric field strength @ distance = 1.0 m from a point charge is 4.0 x 10^4 N/C. What is the Electric field strength @ 2.0 m from the same charge?
*February 27, 2013*

**Physics**

Thanks!
*February 27, 2013*

**Physics**

On the moon's surface, the force of gravity exerted by the moon on a camera is 2.4 N. What is the force of gravity exerted by the moon on the camera when it is in orbit with a radius = to twice the moon's radius?
*February 27, 2013*

**Maths A**

Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range from 48 to 58 inclusive. o The next ten (10) numbers must lie in the range from 30 to 70 inclusive. o The remaining eight (8) numbers must lie in the range from 50 to 95...
*February 25, 2013*

**Maths A**

A tyre manufacturer has chosen 48 tyres at random from a production line and issued them to taxis for testing. Assume that the 48 numbers you have selected refer to the number of thousands of kilometres travelled during the life of each tyre. (For example, a value of ‘32...
*February 25, 2013*

**maths a**

The Bough and Bud Company combined an insect spray with a growth hormone to produce the MOP (More Oranges Production) Treatment, which was expected to increase the number of oranges produced by each tree. The data below shows the number of oranges produced by each tree in two ...
*February 25, 2013*

**MATHS A**

A tyre manufacturer has chosen 48 tyres at random from a production line and issued them to taxis for testing. Assume that the 48 numbers you have selected refer to the number of thousands of kilometres travelled during the life of each tyre. (For example, a value of ‘32...
*February 25, 2013*

**Maths A**

For this question, use the copy of the Random Number table provided at the end of this AAT. (This table was copied from page 111 in the Textbook.) Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range from 48 to 58 ...
*February 25, 2013*

**Maths**

For this question, use the copy of the Random Number table provided at the end of this AAT. (This table was copied from page 111 in the Textbook.) Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range from 48 to 58 ...
*February 25, 2013*

**Math f(x)**

given f(x)= x^2+x and g(x)=2x+1 determine f[g(x)] i dont even know where to start with this question help is much needed
*February 22, 2013*

**chemistry**

A factory that specializes in the refinement of transition metals such as titanium was on fire. Provide kinetic-based arguments (concentration and temperature) explaining why water would be dangerous for the firefighters.
*February 18, 2013*

**Chemistry**

The formula for rust can be represented by Fe2O3. How many moles of Fe are present in 21.3g of the compound? Please help. I am SO confused on all of this!!
*February 16, 2013*

**Math/Accounts**

Estimate the cost of ending inventory based on the retail method using the following information: Cost Retail Beginning Inventory $ 600,000 $ 800,000 Purchases $ 450,000 $ 600,000 Net Sales $1,000,000 A. $150,000 B. $262,500 C. $300,000 D. $750,000
*February 13, 2013*

**Business Analysis**

Mahalyk's Water Fun Shoppe specializes in jet skis. Mahalyk's inventory records showed the following for the past year. Purchase Date Number of Jet Skis Cost Per Jet Ski February 10 30 $4,000 May 12 80 $3,000 June 15 20 $3,500 July 20 15 $2,500 Use the FIFO method to ...
*February 13, 2013*

**Business Analysis**

A firm has the following inventory information for the first quarter: 01/01 Beginning Inventory 50 units @ $5 01/15 Purchases 80 units @ $5.50 02/15 Purchases 60 units @ $5.25 02/15 Purchases 40 units @ $5.75 Sales 170 units @ $10 Total operating expenses $500 What is ending ...
*February 13, 2013*

**Math**

How many distinct numbers greater and equal to 100 and smaller than 3000 can be formed using digits 0,1,2,3,4, without repetition of digits?
*February 12, 2013*

**chemistry**

12.50g of an unknown compound (i=2) are dissolved in 50.00g of water and this solution freezes at –7.5 degrees C. What is the molar mass of this compound?
*February 12, 2013*

**Chemistry**

its concentration, so it should be mol/L
*February 10, 2013*

**Chemistry**

True, however, I keep getting a negative value which is not possible.
*February 10, 2013*

**Chemistry**

Find the initial concentration of NO2 if the concentration after 2.00 min is 0.113. k = 0.331 1/(M * s) 2 NO2 (g) + N2 (g) --> 2 N2O (g) + O2 (g)
*February 10, 2013*

**Psychology**

Dr. Gillian explained that research has identified over 25,000 genes which are responsible for the genetic information which progresses from generation to generation. These genes are:
*February 6, 2013*

**Organic chemistry**

We conducted a diels-Alder reaction of cyclopentadiene with Maleic Anhydride experiment. Though I was wondering why we added ligroin to the maleic anhydride and ethyl acetate. I know ligroin can be used as a solvent, but I thought that ethyl acetate was the solvent in this ...
*February 6, 2013*

**Chemistry**

If it had gone down then how would we calculate it
*February 2, 2013*

**Chemistry**

Freezing point of pure water = -2, Freezing point of Unknown solution = -1 Mass of unknown in 50g of water = 1.9964g. Calculate the delta T for the solution of the unknown solid and determine the molecular weight of the unknown solid.
*February 2, 2013*

**English**

Where reading the poem "LEGAL ALIEN" by Pat Mora . We have to find the rhythm,meter, and assonance . I cant fimd any of that in the poem . Please tell me what each one of them are in the poem .. Reply ASAP please
*February 2, 2013*

**general chemistry**

A reaction involves fictional reagents A & B is begun with the inital concentration of 0.05M A and 0.01M B. The reaction reaches completion in 16 seconds. What is the initial rate of the reaction in respect to A? and what is the order in respect to B
*January 30, 2013*

**Math**

The expression ax^3+2x^2+cx+1 is 5x^3-3 greater than 3x^3+bx^2+d-7x. Find a, b, c, and d.
*January 29, 2013*

**Chemistry**

An aqueous KNO3 solution is made using 73.4g of KNO3 diluted to a total solution volume of 1.86 L. Calculate the molarity of the solution. (Assume a density of 1.05 g/ml for the solution.)
*January 29, 2013*

**elementary math**

thank you..
*January 25, 2013*

**elementary math**

i did use my poof to prove. im not sure im doing right. here is exercises: 'Suppose a,b,c are integers if a|b and a|c, then a|(b+c).' my answer: Proof. Suppose a|b ans a|c. By Definition of divisibility. we know a|b means there is an integer x with b= ax. Likewise, a|c...
*January 25, 2013*

**Precalculus**

How do you solve this problem: sin(90* - x) ----------------- cot^2(90* - x) + 1 The * is a degree symbol!! I haven't seen any problems with degrees in it, usually it's only a variable! If anyone could give me guidelines or show me where to start, I'd really ...
*January 23, 2013*

**physics**

Calculate the speed of a proton having a kinetic energy of 1.00 × 10 −19 J and a mass of 1.673 × 10 −27 kg. Answer in units of m/s
*January 22, 2013*

**Spanish**

Les vas a dar muchos regalos a tus padres. Quiero comprarles unos guantes a mis sobrinos Clara va a venderle sus libros de literatura francesa a su amiga. Los clientes nos pueden pagar con tarjeta de crédito
*January 21, 2013*

**Algebra**

A box with a lid is to be cut out of a 12 inch by 24 inch sheet of thin cardboard by cutting out six x-inch squares and folding them. What are the dimensions to two decimal places of all possible boxes that will have a volume of 100 cubic inches?
*January 15, 2013*

**Geometry**

A triangular entraceway has walls with corner angles of 50, 70, 60. The designer wants to place a tall bronze sculpture on a round pedestal in a central location equidistant from the three walls. How can the designer find where to place the sculpture?
*January 13, 2013*

**math**

I have a board 18" x 18" x 1/8" I need to support it in an upright position at a 15 degree angle. How big must the base of support be to keep it from falling over.
*January 13, 2013*

**geometry**

The coordinates for a rhombus are given as (2a, 0), (0, 2b), (–2a, 0), and (0, –2b). Write a plan to prove that the midpoints of the sides of a rhombus determine a rectangle using coordinate geometry. Be sure to include the formulas.
*January 8, 2013*

**Science**

Does anyone know a Commensalism of the Baltimore Checkerspot? If you do know, I need the awnser ASAP. Please help. Thank you.
*January 8, 2013*

**math**

how do I correctly show four as an array?
*January 3, 2013*

**physics**

A bobcat jumps with a speed of 5m/s at an angle of 55 degrees. How long does the bobcat stay in the air?
*December 23, 2012*

**algebra**

A ball is thrown(from 0') straight up at 50' per second, how long before it hits the ground? How high does it go?
*December 19, 2012*

**Calculus BC**

32
*December 19, 2012*

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