Sunday

April 19, 2015

April 19, 2015

Total # Posts: 1,234

**thermodynamic**

A rigid vessel of 1m^3 contains steam at 20 bar and 400 degree C. the vessel is cooled until the steam is just dry saturated. Calculate the mass of steam in the vessel.
*July 17, 2011*

**algebra**

The perimeter of a square is equal to its area plus four. What is the measure of one side of the square?
*July 2, 2011*

**Algebra II**

Solve 1. 3x^2-9x=0 2. 12x^2+30x=-12 3. 9a(a+1)=4 4. 16x^2=25
*July 1, 2011*

**Health Psychology**

Ok, thank you. I believe I also need to add one more psychologist to the list, making it 5 different psychologists, but I was under the impression I only had to assign 1 job to each. Thank you for clearing this up for me. This helps so much to get a second out look. :)
*June 24, 2011*

**Health Psychology**

I want to make it clear that I do not want any answers to the project I am about to post on here. I only need help understanding it a little. I am trying to get online to speak with my professor but our school site is down at the moment. I think I know what I am doing, I just...
*June 24, 2011*

**physics**

a spring has a force constant of 20000 N/m how far must it be strectched for its potential energy to be 43 J??
*June 24, 2011*

**college algebra**

2/5(5x-3) - 1/3(12x-5). Have the correct answer but need someone to show me how to solve for it.
*June 20, 2011*

**Algebra**

Elena bicycles 4 km/h faster than Robert. In the same time it takes Robert to bicycle 27km/h, Elena can bicycle 39 km. How fast does each bicycle travel?
*June 19, 2011*

**chemistry**

Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction: 2 NO(g) + O2(g) → 2 NO2(g), ΔH°rxn = ? Given: N2(g) + O2(g) → 2 NO(g), ΔH°rxn = +183 kJ 1/2 N2(g) + O2(g) → NO2(g), ΔH°rxn = +...
*June 14, 2011*

**chemistry**

According to the following thermochemical equation, what mass of H2O (in g) must form in order to produce 975 kJ of energy? SiO2(s) + 4 HF(g) → SiF4(g) + 2 H2O(l), ΔH°rxn = -184 kJ
*June 14, 2011*

**chemistry**

A 4.98 g sample of aniline (C6H5NH2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.25 kJ/°C. If the temperature rose from 29.5°C to 69.8°C, determine the value of ΔH°comb for aniline.
*June 14, 2011*

**5th grade math**

If you roll two number cubes numbered 1-6, what is the probability of rolling the same number on each cube?
*June 12, 2011*

**English**

I need help writing a paragraph using these words. Retrospect, Inane, Squelch, Subsidize, and Lethargy.
*June 1, 2011*

**biology**

what school you go to
*June 1, 2011*

**Chemistry**

Given the equilibrium: CO + 2H2 = CH3OH H=-18.0kJ How will the concentration of CO at equilibrium be affected by the following? a) Adding more CH3OH b) Removing some H2 c) Reducing the temperature. I don't understand how i'm supposed to figure these out.. please help!
*May 31, 2011*

**Chemistry 12 **

Why doesn't stirring not affect solution equilibrium??
*May 31, 2011*

**Chemistry**

OMG Doctor Bob you are a huge help! And you right i did have that a dozen times lol but i wasn't sure if i had it right because i couldn't het the last part to work out for me! But i have it now so thanks a bunch!
*May 28, 2011*

**Chemistry**

Balance the following redox equation by the oxidation number methode Ag + HNO3 = AgNO3 + NO + H2O I have all the oxidation numbers i just don't understand how i'm supposed to balance it according to them. I read the sites and i can't get it. Do i balance out each ...
*May 28, 2011*

**english**

Can you fix this sentence? "When the movie Star Wars premiered in 1977, it was both surprising and a revolution in its special effects."
*May 27, 2011*

**chem**

i have all the oxidation numbers for all the of elements but i don't understand how i'm supposed to balance the equation using the oxidation numbers. Do i have to to change the oxidation numbers to equation the same on each side?
*May 25, 2011*

**chem**

Balance the following redox equation by the oxidation number methode Ag + HNO3 = AgNO3 + NO + H2O
*May 25, 2011*

**chem**

How many grams of potassium permanganate (KMnO4) should be added to a 100 mL volumetric flask to prepare a 0.02505 M solution when the flask is diluted to the mark with water?
*May 18, 2011*

**trig**

how do you graph y=-(1/4)sin(3/4x+pi/8? include the amplitude, period, vertical translation, horizontal shift, and table of values please.
*May 11, 2011*

**finite math**

i used x instead of t. thanks
*May 7, 2011*

**finite math**

As online attacks persist, spending on information security software continues to rise. The table gives the forecast for the worldwide sales (in billions of dollars) of information security software through 2007 (t = 0 corresponds to 2002): Year, t 0 1 2 3 4 5 Spending, y 6 8....
*May 7, 2011*

**finite math**

thanks sooooo much!
*May 7, 2011*

**finite math**

Kane Manufacturing has a division that produces two models of hibachis, model A and model B. To produce each model-A hibachi requires 3 lb of cast iron and 6 min of labor. To produce each model-B hibachi requires 4 lb of cast iron and 3 min of labor. The profit for each model-...
*May 7, 2011*

**finite math**

(281.82-250)*48?
*May 7, 2011*

**finite math**

i got $198.87 what about the interest charges?
*May 7, 2011*

**finite math**

The price of a new car is $16,000. Assume that an individual makes a down payment of 25% toward the purchase of the car and secures financing for the balance at the rate of 6%/year compounded monthly. (Round your answers to the nearest cent.) What monthly payment will she be ...
*May 7, 2011*

**finite math**

i put 5.78% and it says it's wrong.
*May 7, 2011*

**finite math**

Carlos invested $6,000 in a money market mutual fund that pays interest on a daily basis. The balance in his account at the end of 8 mo (245 days) was $6,230.23. Find the effective rate at which Carlos's account earned interest over this period (assume a 365-day year). (...
*May 7, 2011*

**geometry**

how to solve y= (x-2)^2+4 4x+2y=14 algebraically
*May 4, 2011*

**English**

thanks
*May 4, 2011*

**English**

My cpu is not letting me view this page
*May 4, 2011*

**English**

What would you say this line ment: I am the chosen no hand saves?
*May 4, 2011*

**Program planning and evaluation**

I dont know
*May 1, 2011*

**chemistry**

What is the mole fraction of sulfuric acid in a solution made by adding 3.4 grams of sulfuric acid to 3500 mL of water?
*April 28, 2011*

**chemistry**

how many grams of glucose C6H12O6 would you need to make 250 mL of 1.0 M solution?
*April 28, 2011*

**chemistry**

how many moles of sucrose C12H22O11 does 300mL of a 0.10 M sucrose solution contain?
*April 28, 2011*

**ah trig help**

use an apropriate sum or difference indentity to prove the double-angle identity cos2u=1-2sin2u
*April 26, 2011*

**trig identies 5.3 &5.4**

i got it nevermind
*April 26, 2011*

**english**

an ode
*April 24, 2011*

**US History**

1. Which three amendments that were passed almost 100 years earlier, guaranteed that African-Americans had the right to vote? 2. Why was the Voting Rights Act of 1965 necessary? 3. Name three ways that local jurisdictions tried to inhibit African-Americans from voting prior ...
*April 24, 2011*

**Chemistry**

At which temperature will the following reactions reverse? Use the thermodynamic date provided at the end of the book. a) 2Ca(s) + O2(g) -> 2CaO(s) b) 2CH4(g) + 4 O2(g) -> 2CO2(g) + 4H2O(g)
*April 7, 2011*

**Chemistry**

The trick is that the heat lost from the metal is equal to the heat gained by the water. So q lost = f gained. Since the metal went from 100.0C to 32.5C I'd say it lost. The water went from 20.0C to 32.5C, so it gained. "q" then represents the metal and "f&...
*April 6, 2011*

**chemistry**

Is it possible to produce a form of sodium ferrate using these components? FeCl3 NaOH NaOCl
*April 5, 2011*

**English**

A critic should read a story more than once in order to write about it. True or False.
*April 5, 2011*

**Math**

Postal regulations specify that a package sent by priority mail may have a combined length and girth of no more than 129 in. Find the dimensions of a cylindrical package with the greatest volume that may be sent by priority mail. Hint: The length plus the girth is 2πr + l...
*April 4, 2011*

**5th Grade Math/Making a Duplicate**

a canoe is 5.67 how much is it in cm
*March 29, 2011*

**Chemistry**

At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) <==> SO3(g) + NO(g)\ If all four gases had initial concentrations of 0.550 M, calculate the equilibrium concentrations of the gases.
*March 27, 2011*

**math **

(x/4−1/x)/(1/2x+1/4)
*March 27, 2011*

**Physics**

A sled of mass 5.98 kg is coasting along on a frictionless ice-covered lake at a constant speed of 1.42 m/s. A 1.98-kg book is dropped vertically onto the sled. At what speed does the sled move once the book is on it?
*March 27, 2011*

**geometry**

How do I solve this? 4/3PI*R^3 When R=6 I get 288 if I do it in PI form. Just seems really high.
*March 21, 2011*

**Alegebra**

i have 5 questions, i dont know how to solve these questions. 7= 2 +5(z-2) 15(s-3)=12s-43 2a-6=3(a-4) 2(b-3)+5=3(b-1) 6x +7 / 5 = x
*March 11, 2011*

**Literature**

1. supernatural 2.imagination 3.everyday occurrences 4.emotional freedom 5.individual freedom 6.love of nature if you're in Brit Lit for the American School like i am... i found the answer in the definition of Romanticism in the back of the Study Guide
*March 10, 2011*

**Algebra**

A brick staircase has a total of 16 steps The bottom step requires 112 bricks. Each successive step requires 4 fewer bricks than the prior one. How many bricks are required to build the staircase?
*March 7, 2011*

**Geometry**

Find the perimeter of a square to the nearest tenth if the length of its diagonal is 16 millimeters
*March 6, 2011*

**Physics**

If you do work on an object in 1/3 the usual time, your power output is ____ times the usual power output
*March 2, 2011*

**Physics**

The work done on an object with a mass of 50 kg raised 3 meters is ________ Nm.
*March 2, 2011*

**Physics**

Two identical gliders slide toward each other on an airtrack. One moves at 1 m/s and the other at 2 m/s. They collide and stick. The combined mass moves at ____ m/s. Answer
*March 2, 2011*

**Physics**

A 2 kg ball rolls at 2 m/s toward a 1 kg ball at rest. After the balls collide they stick together and move at _____ m/s.
*March 2, 2011*

**Physics**

The kinetic energy of a 4 kg object moving at 3 m/s is _______ J.
*March 2, 2011*

**Physics**

The momentum of a 5 kg thrown 3 m/s is _________ kg m/s.
*March 2, 2011*

**Physics**

A 18 N object moves 1 m/s. Its KE is ______ J.
*March 2, 2011*

**Physics**

____ N of work are done on your physics text when you carry it horizontally across a 15 meter wide room.
*March 2, 2011*

**Alegbra sequences**

Year 2003 2004 2005 2006 Populatation 22.12 22.49 22.86 23.41 A. divide the population for each year by the population in the preceeding year. Round to the two decimal places and show the Texas population increase that is approximately geometric. 1.01 B. Write the general term...
*March 2, 2011*

**medical**

I. AMBULATORY CARE FACE SHEET Admit Date: 7/8/20XX @ 20:22 Discharge Date/Time: 7/9/20XX @ 10:10 Sex: M Age: 47 Disposition: Home Admitting Diagnosis: Possible esophageal foreign body. Discharge Diagnosis: Esophageal foreign body. Procedures: EGD with foreign body removal. ...
*February 28, 2011*

**Math**

10+10=20 5.29/20=0.2745 4+4=8 2.98/8=0.3725 The better deal is the one pack of 10 for $5.49 and get one free
*February 27, 2011*

**college algebra**

Find the maximum value of 5x + 7 – x2 on the horizontal span of 0 to 5. (Enter the maximum value of the expression, not the value of x at that point.)
*February 27, 2011*

**college algebra**

If an average-size man with a parachute jumps from an airplane, he will fall 12.5(0.2t - 1) + 19t feet in t seconds. How long will it take him to fall 134 feet?
*February 27, 2011*

**ALGEBRA 1**

Cindy will require $15,000 in 2 years to return to college to get an MBA degree. How much money should she ask her parents for now so that, if she invests it at 12% compounded continuously, she will have enough for school?
*February 27, 2011*

**algebra 1 sequences**

Year 2003 2004 2005 2006 Populatation 22.12 22.49 22.86 23.41 A. divide the population for each year by the population in the preceeding year. Round to the two decimal places and show the Texas population increase that is approximately geometric. 1.01 B. Write the general term...
*February 26, 2011*

**Algebra**

Jennifer takes a job with a starting salary of $39,000 for the first year with an annual increase of 5% beginning in the second year. What is Jennifer's salary, to the nearest dollar
*February 26, 2011*

**chemistry**

Describe how to make 20 mL of a 6.0 % solution from a stock solution with a concentration of 10 %.
*February 22, 2011*

**Algebra**

Find the accumulated value of an investment of $5000 at 5% compounded monthly for 8 years.
*February 22, 2011*

**algebra**

If p(t) is the profit (in dollars) that I expect my business to earn t years after opening, use functional notation to express my expected profit after 4 years and 6 months.
*February 19, 2011*

**Algerbra 2**

I am doing a worksheet for my alg. 2 class and in the worksheet it says: 'Simplify the expression. Assusme all variable are positive.' the problem is perentheses, square root of six times the power of 3 square root of six perentheses power of six!
*February 15, 2011*

**STATISTICS**

Private college and universities rely on money contributed by individuals and corporations for their operating expenses. Much of this money is put into a fund called an endowment, and the college spends only the interest earned by the fund. A recent survey of eight private ...
*February 15, 2011*

**american literature**

list three rhetorical devices that patrick Henry uses in his "speech in the virginia convention." Give an example from the speech of each rhetorical device.
*February 10, 2011*

**literature**

thanks for the help
*February 10, 2011*

**PHY**

Ok...I know this is a stupid question, but I need help! Ok, here it is: An object that has more electrons than it does protons will be _____ a CL^-1 ion. repelled by attracted to unaffected by I know that opposites attract and that same repells, but I am doubting myself with ...
*February 9, 2011*

**Physics**

I have been working on my Phys homework and came accross this question that is giving me some trouble: The charge (coul) on an object increases according to (q) = (2 coul)e[(0.050/sec)(t)], where t is in seconds. At how many seconds is the object deficient 1.56 x 10^20 ...
*February 5, 2011*

**Random Question**

Ok thank you.
*February 5, 2011*

**Random Question**

In the movie "Hauting Sarah" what is the twin sister trying to accomplish??? bringing her son back through her sister?
*February 5, 2011*

**Physics**

A certain "brand-new" (never-used) 9.0 volt cell contains 40mC of charge. The Electric energy "stored" in the cell amounts to about (___) joules. 0.0 0.06 37.5 .36 60x10^-4 I'm not too sure how to figure this problem out. I initially thought 40/9, but ...
*February 5, 2011*

**math**

Angelo is paid double time for each hour he works over 40 hours in a week. Last week he worked 46 hours and earned $520. What is his normal hourly rate?
*February 4, 2011*

**Calculus I**

evaluate and justify each step lim((xe^x)/tan x) as x approaches 1. i just need the over all jest of the problem because i don't know what to do to get rid of the 0 in the denominator. Thanks.
*January 31, 2011*

**physics**

a student does 314 J of work in moving a desk 2.1 m. What was the magnitude of the applied horizontal force?
*January 27, 2011*

**Science Half Lives**

I don't know the answer to your question, but can some one help me with mine? Question: After six half-lives, what percentage of a radioactive sample will remain? Please help me!, Thank you.
*January 25, 2011*

**CP Geometry**

Working with square roots (s.r.) and need help. - s.r. 60/5 This is negative s.r. 60/5
*January 25, 2011*

**CP Geometry**

it was a riddle. the answer was a jab well done.
*January 24, 2011*

**CP Geometry**

What do you call it when the nurse gives you a shot you hardly feel? s.r. = square root s.r.5 * s.r. 15. my choices are 5s.r.3, 20s.r.5, 4s.r.10, 3s.r.2, 3s.r.10, 2s.r.6, 9, 5s.r.6, 10s.r.3.
*January 24, 2011*

**Chemistry**

If the equilibirium reaction is 2 03(g) <--> 3 O2 9(g) is first order with respect to ozone, what type of plot( meaning what is plotted on the y axis vs what is plotted on the x-axis) will yield a straight line? what will the slope of the line represent? PLEASE help im ...
*January 23, 2011*

**Chemistry**

Sorry I typed it wrong i meant IF the rate of consumption of N2O4 (below) is .0221 what is the rate of production of NO2?
*January 23, 2011*

**Chemistry**

IF the rate of consumption of N2)4 (below) is .0221, what is the rate of production of NO2? N2O4(g)<->2NO2(g) Please help and explain. BC i have to actually understand how to do the problem. Thanks
*January 23, 2011*

**Comm215**

In this problem: Sally told Janice that she made the honor role. __ Pronoun shift in number __ Pronoun shift in person __ Ambiguous reference __ No error What does ambiguous reference mean?
*January 17, 2011*

**math**

If you borrow $5,000 at an APR of 5%. Find the interest, I after 36 months
*January 13, 2011*

**Math**

5% interest rate for 5,000,00 how much after 4 years
*January 13, 2011*

**physics**

A 10kg block is sliding at 10m/s along a frictionless track which suddenly curves straight up. how high will the block rise
*January 12, 2011*