Saturday

November 29, 2014

November 29, 2014

Total # Posts: 864

**Chemistry**

What is the heat required in Joules to raise the temperature of 100.0g ice at -20 degrees C to steam at 120 degrees C?
*May 14, 2011*

**Chemistry**

What is the heat in Joules required to raise the temperature of 100g H20 from 288K to 308K?
*May 14, 2011*

**chemistry**

the density of a piece of wood is 0.638 g/cm3. The dimensions of the block of wood are 40.0 cm by 50.0 cm by 25.0 cm. What is the mass of the block of wood? Show all calculations.
*May 10, 2011*

**algebra**

simplify, and plese show me how you did it. I am stumped. 24 divide 1/2 + 5/8 * 6/7 thank you.
*May 9, 2011*

**macroeconomics**

How much of a change in the economy will result if business increase their level of investment by $8 billion and the MPC in the economy is 4/5? If the MPC is 2/3?
*April 27, 2011*

**Physics**

Glass of water has mass of 240g at room temp (25°C). Add 50g of 0°C ice. What final temp after ice is melted. (at equilibrium).
*April 26, 2011*

**math**

The mean time for running a mile is 450 se4conds with a standard deviation of 40 seconds. What time would you need to beat to be in the top 10%?
*April 23, 2011*

**Statistics**

length of time in minutes required to complete exercises is distributed with a mean of 60 minutes and a std. deviation of 8 minutes. what percent will require between 60 and 76 minutes to complete the exercises? what percent of participants will require more than 72 minutes to...
*April 20, 2011*

**Chemistry**

Which of the following statements are true? Fusion reactions result in nuclei with higher Z. To keep a nuclear power plant going, a chain reaction must be maintained. Nuclear fusion produces no long-lived radioactive by-products. The Sun is a nuclear fusion reactor. I tried ...
*April 19, 2011*

**algebra**

One week, you earned $1350. Let x represent your total sales that week. Write an equation that could be used to find x.
*April 16, 2011*

**survey of economics**

How would you compute changes in Microsoft’s volume of output from one year to the next? How would price changes affect your computations?
*March 23, 2011*

**Algebra II**

are you sure 9 and 2 is right??
*March 22, 2011*

**Algebra II**

Can someone please help me with this problem. Given Matrix Y= 2 -7 4 and -1 1 0 Matrix Z= 3 4 1 4 2 -4 Solve for matrix X. X-2Y=3X+Z HELP PLEASE!!!
*March 22, 2011*

**Chemistry**

Approximately how much water should be added to 10.0 mL of 12.0 M HCl so that it has the same pH as .90 M acetic acid(Ka= 1.8 x 10^-5)?
*March 13, 2011*

**Chemistry**

The blank solution used to calibrate the spectrophotometer is 10.0mL of 0.2M Fe(NO3)3 diluted to 25.0mL with 0.1M HNO3. Why is this solution preferred to simply using de-ionized water for the calibration?
*March 12, 2011*

**economics**

What would happen to unit sales and total revenue for this textbook if the publisher reduced its price?
*March 6, 2011*

**Math**

I want to make a fence with a perimeter of 42 feet and an Area of 58 square feet. Label all sides of the fence.
*March 3, 2011*

**finance**

Anne is planning to attend college when she graduates from high school in 7 years from now. She anticipates that she will need $10,000 at the beginning of each college year to pay for tuition and fees, and have some spending money. Anne has made an arrangement with her father ...
*March 1, 2011*

**software**

Sorry can you explain please
*March 1, 2011*

**software**

<?xml version="1.1"?> <reference> <author/>Compton, R.</author> <year>2010</year> <articletitle>SOA explained</articletitle> <journaltitle>Retail Management</journaltitle> <issue>vol. 14 no. 6, June<...
*March 1, 2011*

**hardware**

Hi i'm just stuck on this question. can please someone help me. Three cortrect ones are: A) A 9-bit word represents twice as many code words as an 8-bit word. B) mp4, mpg and bmp are all examples of video file extensions. C) A data rate of 4 gigabits per second means that ...
*March 1, 2011*

**Math **

Suzanne wants to put a fence around her square garden. If the garden covers an area of 64 ft2, how many feet of fencing does she need?
*February 28, 2011*

**math**

thank you
*February 23, 2011*

**math**

I dont understand the rules for adding and subtracting postive and negative ,can you please explain it to me? im having a test
*February 23, 2011*

**6th grade english**

Can you recommend a site where I can get some examples of prepositional prases?
*February 20, 2011*

**sociology**

This assignment is confusing me, is there anyone that can lead me in the right direction? The assignment is as follows. If appointed to head the U.S. Civil Service Commission, what polices would you propose to reduce radical ethnic strife in the U.S. and why? This assignment ...
*February 19, 2011*

**math**

In the trapezoid above, base R is 16 units and base S is 24 units. The trapezoid has a height of 9 units. What is the area of the trapezoid?
*February 17, 2011*

**chemistry**

write the formulas of the complex ion formed between a) the ligand, Cl-, and the platinum(II) ion with a coordination number of four. b) the ligand, NH3, and the nickel(II( ion with a coordination number of six. c)the ligand, ethylenediamine, and the chromium (III) ion with a ...
*February 17, 2011*

**chemistry HELP PLEASE**

write the formulas of the complex ion formed between a) the ligand, Cl-, and the platinum(II) ion with a coordination number of four. b) the ligand, NH3, and the nickel(II( ion with a coordination number of six. c)the ligand, ethylenediamine, and the chromium (III) ion with a ...
*February 17, 2011*

**early childhood literacy**

not arbitrary symbols
*February 16, 2011*

**Algebra**

5/(6 x)-2/3 = 4-2/x
*February 15, 2011*

**math**

The length of a rectangle is 4 times its width. Express the perimeter, P, of the rectangle as a function of the width, w.
*February 15, 2011*

**math**

You flip a coin and toss a 1-6 number cube what is the probabilty of getting a 5 and tails
*February 13, 2011*

**computer science**

In the TCP/IP model, the best path through the network is determined at the ______________ layer. In the OSI model, the same function is carried out at the ______________ layer. A network access network B network access transport C internet network D internet transport E ...
*February 13, 2011*

**computers**

Can please help me, i'm stuck on thios question:- Q) Select the two true statements from the following list. A)In the OSI model, PDUs at layer 2 are called frames and PDUs at layer 3 are called packets. B)In an IPv4 packet header the Time-to-Live field is 8 bits. This ...
*February 10, 2011*

**Math**

50MB file is compressed using a compression ratio of 10. What is the compressed file size?
*February 10, 2011*

**math**

exmple of porportion and ratios in your daily lives.
*February 9, 2011*

**computer science**

can please help me to fill this: In the TCP/IP model, the best path through the network is determined at the ______________ layer. In the OSI model, the same function is carried out at the ______________ layer.
*February 9, 2011*

**algebra**

35+ 6 x < 20 -2
*February 8, 2011*

**Algebra**

35+ 6x <29-2
*February 8, 2011*

**Math**

Can please someone check my answer: a)385 data loss incidents took place b)110 million people were affected by personal data loss incidents c)3% of all data loss incidents were caused by hard copy theft/loss d)20% of all data loss incidents were caused by portable media theft/...
*February 8, 2011*

**4th grade math**

96
*February 7, 2011*

**Computer science**

can you please explain, i didn't get it. Thanks
*February 7, 2011*

**Computer Science**

Can please someone check my answer: a)385 data loss incidents took place b)110 million people were affected by personal data loss incidents c)3% of all data loss incidents were caused by hard copy theft/loss d)20% of all data loss incidents were caused by portable media theft/...
*February 7, 2011*

**Algebra 2**

Walking at 4km/h, Bruce can make the roundtrip between his campsite and Lookout Point in 2.5 h. Rowing on Crooked River, he can row upstream from the campsite to Lookout Point in 1 h and can row back again in 40 min. Find Bruce’s rate of rowing in still water and the ...
*February 6, 2011*

**lab**

i need 200mL of an 8 molar solution of dilute acid, and my stock cconcentrate is 18 molar, how much of the concentrate, and how much water will i need?
*January 31, 2011*

**chemistry help**

the rate constant (k) for a reaction was measured as a function of temperature. A plot of In k versus 1/T (in K ) is linear and has a slope of -1.01 x 10^4 K. Calculate the activation energy for the reaction. i dont know how to solve it???
*January 31, 2011*

**algebra**

If a pizza is 15.00 and the cost is 55.00 labor is 4.00 what is the equation to determine revenue?
*January 26, 2011*

**social studies**

1) how did the fact that fur trading companieswere econimic imperialists affect the development of westerm Canada? 2) how did the arrival of settlers in the West affect the fur trade? 3) describe the role played by Native peoples in the fur trade. 4) describe the role played ...
*January 19, 2011*

**Computer Science**

a)385 data loss incidents took place b)110 million people were affected by personal data loss incidents c)3% of all data loss incidents were caused by hard copy theft/loss d)20% of all data loss incidents were caused by portable media theft/loss e)15% of data loss incidents ...
*January 16, 2011*

**computer science**

What are the differences between VPN and private network?
*January 16, 2011*

**geometry**

this answer is incorrect .
*January 13, 2011*

**Science/language arts**

I need a poem that I need about lithosphere
*January 11, 2011*

**Geometry**

In a triangle labeled ABC with the following coordinates A(-3,2) B (0,4) C (2,-1) What is the image of each vertex? Give answer as an ordered pair.
*January 11, 2011*

**Geometry**

In a triangle labeled ABC with the following coordinates A(-3,2) B (0,4) C (2,-1) What is the image of each vertex? Give answer as an ordered pair.
*January 10, 2011*

**Algebra 2**

One of the the zeros of the functions F(x)= x^4+2x^3-13x^2-38x-24 is x=-3, find the other zeros of the function.
*January 9, 2011*

**geometry**

this answer is incorrect .
*January 6, 2011*

**precal**

are there solutions to x^3+27i=0 is so what are they?
*December 30, 2010*

**precal help**

Find a Parabola with Vertex (3,1) Focus (4,1) Find the vertex of 4y^2+4y-16x+13=0 Find the center of an ellipse 9x^2+4y^2-36x-24y-36=0 Find an ellipse with minor axis of 8 and vertices at (-9,3),(7,3)
*December 30, 2010*

**PRECAL**

answers please btw steps arent necessary
*December 29, 2010*

**PRECAL**

Find a Parabola with Vertex (3,1) Focus (4,1) Find the vertex of 4y^2+4y-16x+13=0 Find the center of an ellipse 9x^2+4y^2-36x-24y-36=0 Find an ellipse with minor axis of 8 and vertices at (-9,3),(7,3)
*December 29, 2010*

**chemistry**

determine the mass of phosphoric acid that can be produced by the reaction of one thousand tons of phosphate rock and sulfuric acid
*December 20, 2010*

**math 116**

Simplify. -2[38-(-56-50)]=
*December 16, 2010*

**physics**

are you sure? because this is a acceleration in two dimensions problems. the answer is supposed to be in the form of ( , )m/s.
*December 15, 2010*

**physics**

help please. thankyou.
*December 15, 2010*

**physics**

An electron starts at rest. Gravity accelerates the electron in the negative y direction at 9.80 m/s2 while an electric field accelerates it in the positive x direction at 3.80×106 m/s2. Find its velocity 2.45 s after it starts to move.
*December 15, 2010*

**physics**

that is indded correct! can you help me on the other question i had too? its right above this post. it is either the electron or cannon question. thanks so much again!
*December 15, 2010*

**physics**

please can someone help?
*December 15, 2010*

**physics**

A long jumper travels 8.95 meters during a jump. He moves at 10.8 m/s when starts his leap. At what angle from the horizontal must he have been moving when he started his jump? You may need the double-angle formula: 2 sin u cos u = sin (2u)
*December 15, 2010*

**physics**

can someone pls help me??
*December 15, 2010*

**physics**

An electron starts at rest. Gravity accelerates the electron in the negative y direction at 9.80 m/s2 while an electric field accelerates it in the positive x direction at 3.80×106 m/s2. Find its velocity 2.45 s after it starts to move.
*December 15, 2010*

**Music**

Did will smith write his own music?
*December 15, 2010*

**College Chemistry-Please**

THANKS!!!
*December 4, 2010*

**College Chemistry-Please**

*Only need input not doing it for me. PLEASE QUESTION: Some hydrocarbon fuels have sulfur present and contribute to air pollution. When this solid sulfur is burned in the presence of oxygen, the noxious, toxic gas sulfur dioxide results. If there is .50 grams of sulfur and 1....
*December 4, 2010*

**Chemistry 111**

Thanks! I knew the formula but wasn't quite sure if i convert mL to L in the formula. I know that I must covert C to K and Torr to Atm for the equation.
*December 3, 2010*

**english**

did dwight d eisenhower achieved the american dream?
*November 22, 2010*

**math**

200 pages 20 divided by .10
*November 22, 2010*

**research and evaluation**

Give examples of both discrete and continuous data? What makes them different? Is the measurement of money continuous or discrete? Explain. Can discrete data be analyzed using the normal distribution? Why or why not?
*November 18, 2010*

**research and evaluation class**

describe joint probability for independent events and give an example of how you would calculate it. How is this different than conditional probability? The following payoff table gives the return on three alternative business decisions based on three possible scenarios –...
*November 18, 2010*

**geometry**

find AB if BD is a median of triangle ABC
*November 16, 2010*

**algebra**

What is x/3=7/6
*November 15, 2010*

**business**

describe why it is important to consider each domain in the study of adult development
*November 15, 2010*

**Science**

When learning about types of energy what are the types of energy for: A. a lit match, yo-yo, bicycle, trampoline, apple, lightbulb, cooker, moving bullet, nuclear bob, hairdryer, solar panel,campfire, car, human, tv, mobile phone, thanks
*November 4, 2010*

**9th grade**

What is the total supply for US - silk, coffee, or bananas or all of them?
*November 2, 2010*

**chemical principal**

a chemist weidghed 1.25g of sodum hydroxide ,placed it in a volumetric flask and then added enough deionized water to bring the total volume to 250mL. How many moles of NaOH were added to the volumetric flask
*November 2, 2010*

**chem--please help me!!**

when a 25.0 mL sample of an unknown acid was titrated with a 0.100 M NaOH solution. Determine Ka for the unknown acid. Volume NaOH = 12.5 mL; pH=3.80 please help me explain in details!!!
*October 30, 2010*

**spanish**

presidencial día esté Thank you for the help.
*October 26, 2010*

**spanish**

Hoy en dia pavos SON perdonados en caso de que el pavo no este disponible para el perdón presipdencial. Is SON correct in this sentence and if it is, why?
*October 26, 2010*

**chem**

35.00 grams of propane C3H8 are burned. How many grams of CO2 ARE PRODUCED
*October 26, 2010*

**algebra**

I get confused when solving for some of the fractions in my problem. how would you solve for 1+(-2/(sqroot 5))? I just need a refresher on the order of operations for it. Thanks!
*October 25, 2010*

**college**

describe why it is important to consider each domain in the study of Adult Development?
*October 23, 2010*

**ECONOMICS HELP PLEASE **

i need to find any sources (articles) dealing with factory orders, employment levels, foreign companies, and factory closures... because I need to write a page of each one of them and what it means also...please help me on it
*October 22, 2010*

**math**

If f(x)=(3x+6)^–1, find f'(x).
*October 21, 2010*

**math**

If f(x)=(3x+6)–1, find f'(x).
*October 21, 2010*

**Chemistry **

27.0 mL of 1.00 M HClO4 are mixed with 27.0 mL of 1.00 M LiOH in a coffee cup calorimeter. The calorimeter constant is 28.1 J/C. Both were initially at 21.31 C. Calculate delta H(rxn) in kJ/mol for the reaction.
*October 20, 2010*

**statistics**

What would be the range of the scores 71, 37, 48 from the same set with 95% cofidence level?
*October 17, 2010*

**chemistry**

.819 mol CO2= 30604 g CO2 X= 3.604 g CO2/100.09 g/molCaCO3= .036 mol CaCO3 Y=3.604 g CO2/84.32 g/mol MgCO3= .043 mol MgCO3 I'm stuck. I don't think I did it right.
*October 17, 2010*

**chemistry**

Thank you. But could you explain how you got that equation for solving for x and y? I need to prove my answer.
*October 17, 2010*

**chemistry**

A mixture of CaCO3 and MgCO3 weighing 7.85 g was reacted with excess HCL. The reactions are CaCO3+2HCL=CaCl2+H2O+CO2 and MgCO3+2HCl=MgCl2+H2O+CO2. The sample reacted completely to produce 1.94 L CO2 at 25 degrees C and 785 torr. Calculate the percentage of CaCO3 and MgCO3 in ...
*October 17, 2010*

**Chemistry**

Given one of the following solution: 50.00mL of 0.10M of K2CrO4 answer the following. 1. How do you prepare the solution? 2. What volume (mL) of your solution contains 5.00X10(-4) moles of the solute? 3. What volume of your solution contains 1.00g of the solute? 4. What is the...
*October 17, 2010*

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