Saturday

January 31, 2015

January 31, 2015

Total # Posts: 78

**chemistry**

Hi lewis, please specify what variables (i.e.) water you are using
*January 13, 2015*

**chemistry**

The equilibrium constant for the chemical equation is K = 4.90 at 199 °C. Calculate the value of the Kc for the reaction at 199 °C. N2(g)+3H2(g)=2NH3(g) Kc=?????
*November 9, 2014*

**Math**

if it takes 1 second to place a grain of rice on the chessboard, how long will it take to place all the grains on the chessboard for each reward? example: Reward A had 3768 grains Reward B had 73628 grains Reward C had 82613 grains what is the formula to follow ? and how ...
*August 21, 2014*

**math**

A beam having a length of 20 metres is pivoted at its mid point. A 200 newton load is located at a point 5 m from the right hand end of the beam. A 300 newton load is located at a point 8 m from the right hand end. In order for the beam to be in equilibrium, what load is ...
*August 11, 2014*

**Maths!! Sinusoidal!**

1.Jim and Chana are riding the Ferris wheel like the one diagrammed here. It is supported on a triangular base having a bottom of 18.460m and sides of 14.359m. During the ride Jim observed Chana, while Chana observed that at the bottom of the ride she passed the two structural...
*July 25, 2014*

**engineering economics analysis**

where can i attach a file ?
*June 20, 2014*

**statistics**

n a survey of 634 males ages 18-64, 392 say that they have gone to the dentist in the past year contrast 90% and 95% confidence intervals for the population proportions, interperate the results and compare withsof the confidence intervals
*July 14, 2013*

**ITT**

The time spent (in days) waiting for a heart transplant in two states for patients with type A+ blood can be approximated by a normal distribution, as shown in the graph to the right. mean of =128 Standard deviation of=23.3
*June 24, 2013*

**Algebra 2/ Trigonometry**

The expression oos² θ/sin θ + sin θ is equivalent to 1) 1 + cos² θ 2) cos² θ 3) sin θ 4) csc θ
*April 27, 2013*

**Algebra 2/ Trigonometry**

I typed what i wrote correctly these questions are from a work sheet therefore your smart comments aren't needed if you simply can not solve it, just don't post.
*April 27, 2013*

**Algebra 2/ Trigonometry**

If cos θ = c, then sin²θ/2 equals 1) 1-c/2 2) 1+c/2 3) 1-c/c+c 4) 1-c/4
*April 27, 2013*

**Algebra 2/ Trigonometry**

The expression 4 - cos² A is equivalent to 1)5 - sec² A 2)5 - sin² A 3)5 + sin² A 4)5/sec² A
*April 27, 2013*

**Algebra 2/ Trigonometry**

If cos y = -4/5 when 90°≤ y ≤ 180° what is the value of cos 2y?
*April 27, 2013*

**Algebra 2/ Trigonometry**

The expression sin(2π - θ)is equivalent to
*April 27, 2013*

**Chemistry**

Hey Lori and others who would like to know the answer, the formula you should be using in this case would be the Dilution formula. C1(V1)=C2(V2) (the ones and twos are subscripts). Once you get the formula all written down, the work should look like this: C1(V1)=C2(V2) 1.667 ...
*February 21, 2013*

**Economics Help ASAP!!?**

1. How do they stock market performance indicators help predict the performance of the market? 2. What are their flaws?
*February 1, 2013*

**Physics**

A solid gold bathtub (mass=250 Kg)is pushed along a horizontal cement road (mew=0.59)by criminals. The criminals, in fear of capture, run away and leave the bathtub sliding with a velocity of 9 m/s. Assuming all kinetic energy is converted to heat from frictional work. 1.How ...
*January 28, 2013*

**Physics**

You saved my life Elena. Much appreciated.
*January 28, 2013*

**Physics**

A solid gold bathtub (mass=250 Kg)is pushed along a horizontal cement road (mew=0.59)by criminals. The criminals, in fear of capture, run away and leave the bathtub sliding with a velocity of 9 m/s. Assuming all kinetic energy is converted to heat from frictional work. 1.How ...
*January 28, 2013*

**Physics**

The mass of an object at the earths surface is 100 kg. Calculate the force of gravity of the same mass if it is moved a distance of 4 radii from the earths centre.
*January 28, 2013*

**Physics**

Two spheres are placed at a distance of 10 m from each other. The force of gravity between them is 6.673x10 to the (-9)N. If one of the spheres is 4 times as massive as the other what are their masses in Kg?
*January 28, 2013*

**Chemistry ASAP**

3. Methane (CH4), ammonia (NH3), and oxygen (O2) can react to form hydrogen cyanide (HCN) and water according to this equation: CH4 + NH3 + O2 HCN + H2O You have 8 g of methane and 10 g of ammonia in excess oxygen. Answer the following questions: • What is the ...
*January 18, 2013*

**Chemistry**

THANK YOU SO MUCH!
*January 18, 2013*

**Chemistry**

What type of chemist would study the energies and heats involved in chemical reactions?
*January 18, 2013*

**Program logic design**

• Assignment 1: Chocolate Delights Candy Company, Part 1 Due Week 5 and worth 210 points Chocolate Delights Candy Company manufactures several types of candy. Design a flowchart using Visual Logic for the following: 1. A program that accepts a candy name (for example, &#...
*August 1, 2012*

**geometry**

Find the total area for the cylinder with the given measurement. r = 2, h = 4
*June 21, 2012*

**chemistry**

How many molecules are in 25 grams of NH3
*June 14, 2012*

**chemistry**

How many molecules are in 25 grams of NH3
*June 14, 2012*

**science**

A microwave oven has a power requirement of 1264 W. A frozen dinner requires 5.5 min to heat on full power.
*February 9, 2012*

**programming**

Can someone tell me if i did this right?
*December 1, 2011*

**programming**

// This pseudocode should determine the rental fees for cars // Standard cars rent for $65 per day; compacts rent for $40 per day // and subcompacts rent for $30 per day // Rentals for at least 7 days receive a 20% discount // An error message is displayed if the car type is ...
*December 1, 2011*

**PHYSICS**

A race car travels northward on a straight, level track at a constant speed travels 0.760 km in 20.0 s. The return trip over the same track is made in 25.0 s. (a) What is the average velocity of the car in m/s for the first leg of the run? m/s (b) What is the average velocity ...
*October 16, 2011*

**acc 121**

Bob is investing in a partnership with Andy. Bob contributes as part of his initial investment, Accounts Receivable of $80,000; an Allowance for Doubtful Accounts of $12,000; and $8,000 cash. The entry that the partnership makes to record Bob's initial contribution ...
*June 3, 2011*

**business**

who are the relevant market and nonmarket stakeholders in the cisco in the coyote valley case study
*December 1, 2010*

**chemistry**

1 Al per 3 e-
*November 22, 2010*

**chemistry**

What mass of aluminum metal can be produced per hour in the electrolysis of a molten aluminum salt by a current of 24 amps? All i need is the moles of Aluminum per moles of electons. thanks
*November 22, 2010*

**chem**

Calculate delta G rxn for a redox reaction with n = 2 that has an equilibrium constant of K = 4.4×10−2.
*November 22, 2010*

**chemistry**

Calculate the solubility (in grams per 100 mL of solution) of magnesium hydroxide in a solution buffered at pH = 12. I can get the answer in grams per mole, but i am having difficulty changing it to g/100ml.
*November 1, 2010*

**chem**

A 120.0 mL buffer solution is 0.105 M in NH3 and 0.135 M in NH4Br, What mass of HCl could this buffer neutralize before the pH fell below 9.00?
*October 25, 2010*

**chem**

I am trying to figure out how to calculate the ratio of CH3NH2 to CH3NH3Cl required to create a buffer with pH of 10.26, I'm not sure where to start.
*October 25, 2010*

**chem**

I am trying to figure out how to calculate the ratio of CH3NH2 to CH3NH3Cl required to create a buffer with pH of 10.26, I'm not sure where to start.
*October 25, 2010*

**chem**

I need to know how to write an equation showing how a buffer containing ammonia and ammonium chloride neutralizes added acid of HNO3.
*October 24, 2010*

**2nd grade**

What is the pattern for these numbers 20, 24, 28, 32, 36?
*October 5, 2010*

**chem**

Write a chemical equation for Sr(OH)_2(aq) showing how it is a base according to the Arrhenius definition. I came up with Sr(OH)_2 (aq)--> Sr^+(aq) + OH ^- (aq). is this the final answer?
*October 4, 2010*

**chem**

What mass of sucrose should be combined with 524 g of water to make a solution with an osmotic pressure of 8.50 atm at 270 K? I keep working this and end up with 68.81g but it is not right, any help?
*September 13, 2010*

**chem**

How much water would be needed to completely dissolve 1.64 L of the gas at a pressure of 750 torr and a temperature of 21 C? Henrys law constant is .145 M/atm.
*September 13, 2010*

**chem**

How much water would be needed to completely dissolve 1.64 of the gas at a pressure of 750 torr and a temperature of 21 C? Henrys law constant is .145 M/atm.
*September 12, 2010*

**college chem**

What mass of sucrose should be combined with 524 g of water to make a solution with an osmotic pressure of 8.50 atm at 270 K? (Assume the density of the solution to be equal to the density of the solvent.)
*September 12, 2010*

**math **

What is the common denominator? What are the equivalent fractions? 3, 6. 15 help
*August 10, 2010*

**math **

3, 6. 15
*August 10, 2010*

**math **

13/15 + 2/3 - 3/5 =
*August 10, 2010*

**math **

3/10 + 7/12 = ?
*August 10, 2010*

**College Chemistry**

a (s) is obtained by mixing 25ml of 0.5 mol/l HCl and 25ml of 0.5 mol/l H2SO4 solution is titrated with 93.75ml of barium hydroxide solution 1-write the ionic eq. 2- calculate C 3. determine mass of barium sulfate obtained:P *molar masses: Ba=137 S=32 O=16
*July 7, 2010*

**math**

Calculate the volume of a sphere with a radius of 4.0 cm. Use pi=3.14 in your calculations. Assume the units are cm3 and do not include them in your answer. Round your answer to the nearest tenth.
*July 6, 2010*

**chemistry**

c2h6
*June 21, 2010*

**Math**

So, if Ana rolls a 6, does the game end instantly, or does Bob get to flip a coin one last time? If he does, and gets a head, does the game continue or do they declare it a tie? Does the question really ask for the probability that Ana wins the game, or does it ask for the ...
*May 31, 2010*

**math**

x^2-4y^2=0 is what conic section?
*May 31, 2010*

**college math**

The number of seniors at Freedom High School was 421 in 2002. If the number of seniors increases at a rate 1.7% per year, how many seniors will be in the class of 2014?
*May 31, 2010*

**Pre-Cal**

A piece of charcoal of mass 35g is found in the ruins of an ancient city. The sample shows a carbon-14 activity or R(t)=4.167 decays/sec. Convert the decay constant of ^14C from (1)(a)in terms of seconds instead of yrs. Find the number of atoms N(t)using constant you found.
*April 8, 2010*

**Pre-Cal**

The radioactive isotope of Carcon (^14C)has a half life of 5730. What is the decay constant of ^14C? If we start with a sample of 1000 carcon nuclei, how many will be left in 22920 years time?
*April 8, 2010*

**12th grade**

The radioactive isotope of Carcon (^14C)has a half life of 5730. What is the decay constant of ^14C? If we start with a sample of 1000 carcon nuclei, how many will be left in 22920 years time?
*April 8, 2010*

**Hypothesis testing**

5 Part Question: 6 timed runs were made along route A with an average of 95 minutes and a standard deviation of 10.5 minutes. Route B had 8 test runs with an average of 93 minutes and a standard deviation of 5.2 minutes. Determine if there sufficient evidence that route B is ...
*April 2, 2010*

**mrs johair**

yughy9iujk
*March 24, 2010*

**Math**

Find the inverse of this function: f(x) = x^2 + 2x - 1, x>0 So far I just switched the x and y's...so it looks like this now: x = y^2 + 2y - 1 I know you're solving for y, and I want to factor (or use quadratic formula)...but x is in the way. So I'm not sure ...
*February 11, 2010*

**Math**

What are the points of discontinuity (if any) in the following function? y=(2x-1)^(1/3) Thanks
*February 9, 2010*

**History**

Which neutral nations later joined the Central Powers/Allies in WWI? I know for sure the original Central Powers are Germany, Austria-Hungary, and Bulgaria. And the Allies are Russia, France, and Great Britain... Thanks!
*January 31, 2010*

**Math**

(I have two questions) 1. Solve for x without a calculator: log3(x^2)=2log3(4)-4log3(5) This is what I have so far: 2log3(x)=log3(4^2)-log3(5^4) 2log3(x)=log3(16/625) ...and now I'm stuck. 2. Simplify: 2log4(9)-2log3 <--how do you simplify with different bases? Thanks!
*January 28, 2010*

**math**

how do you find a line perpendicular to another if the given line is in standard form, Ax+By=c? also, i need some help finding a line perpendicular to y=3 and crosses the points (2,4). help plz?
*December 12, 2009*

**Physics urgent**

A rubber puck, initially travelling at 39 km/h, is sliding along an icy surface. How long (in seconds) would it take the puck to come to a complete stop if the coefficient of kinetic friction between the puck and the ice is 0.2?
*October 8, 2009*

**Physics urgent**

What is the weight of a 76 kg astronaut on the Moon where the value of 'g' is only 17% the strength of 'g' on the Earth? (Answer should be expressed in N).
*October 8, 2009*

**Physics 20**

A 2.50-kg Pendulum is attatched to a string 11.4m stringis pulled aside until it is.386m above its lowest position and released. The pendulum is designed to emit sound waves at a frequency of 440 Hz; However, as it swings toward and away from an observer, the frequency appears...
*July 13, 2009*

**english**

2.Which sentence uses correct parallel construction? A. The painter wore glasses, gloves, and boots. B. Most people enjoy ice cream and the plant grows. C. You can either talk to the manager about your problem or writing a letter to the president of the company. D. Anyone who ...
*May 8, 2009*

**calorimetry**

if 158 grams of silver at a temperature of 98.5 degrees celcius is placed in a styrofoam cup of 85 grams of water at 13 degrees celcius, what would the final temperature of the water be in two minutes
*February 25, 2009*

**health**

CAN ANYONE RE A SURES ME.
*August 4, 2008*

**health**

so based on what i read D is the best answer can you correct me if i'm wrong.
*August 4, 2008*

**health**

What is the training effect? A. The tendency to suffer injuries as a result of too much exercise B. Shortness of breath and dizziness caused by overexertion C. An increase in the resting heart rate and a decrease in the stroke volume of the heart D. A term that describes the ...
*August 4, 2008*

**science**

ok this is a word search! study of ancient artifacts- study of animals_ study of prehistoric fossils- study of chemical matter- study of the laws of motion and matter- study of life sciences-
*November 11, 2007*

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