Thursday

April 2, 2015

April 2, 2015

Total # Posts: 1,147

**Physics**

So in solving the answer it would be F=(8.99E9)*(2.5E13*1.6E-19)*(2.5E13*1.6E-19)/.50^2? If so, I dont think I did it right. I ended up with an answer of .57536
*September 26, 2010*

**Physics**

Two very small spheres are initially neutral and separated by a distance of 0.50 m. Suppose that 2.50 x 10^13 electrons are removed from one sphere and placed on the other. What is the magnitude of the electrostatic force that acts on each sphere?
*September 26, 2010*

**Mastering Chemistry **

Molarity(M)=amount (mol) of solute/volume (L)of solution. im gonna guess you have 11.0g and 75.0 mL convert ml to L -> 75/1000=0.075L ->177 molar mass of Luminol 11.0 x(1/177)/0.075 = your answer in units of M
*September 25, 2010*

**Calculus**

If h(t) represents the height of an object above ground level at time t and h(t) is given by h(t) = −16t2 + 96t + 1, find the height of the object at the time when the velocity is zero.
*September 22, 2010*

**geometry**

If m<PQR=(10x-7),m<RQT=5x, and m<PQT=(4x=6)
*September 20, 2010*

**Chemistry**

What is the molecular, ionic and net ionic formula for Acetic acid and sodium nitrate Molecular: Ionic: Net Ionic:
*September 20, 2010*

**physics**

When it says magnitude of velocity is that the same as the final velocity before impact? The word "magnitude" threw me off.
*September 19, 2010*

**physics**

A child throws a ball with an initial speed of 8 m/s at an angle of 40 degrees above the horizontal. The ball leaves her hand 1 m above the ground. How long is the ball in flight before it hits the ground? What is the magnitude of the ball's velocity just before it hits ...
*September 19, 2010*

**physics**

Richard is driving home to visit his parents125 mi of the trip are on the interstate highway where the speed limit is 65 mph Normally Richard drives at the speed limit, but today he is running late and decides to take his chances by driving at 80 mph.how many minutes will he ...
*September 19, 2010*

**Chemistry**

A mixture contains only NaCl and Al2(SO4)3. A 1.45-g sample of the mixture is dissolved in water and an excess of NaOH is added, producing a precipitate of Al(OH)3. The precipitate is filtered, dried, and weighed. The mass of the precipitate is 0.107 g. What is the mass ...
*September 18, 2010*

**physics**

Mary needs to row her boat across a 120 m -wide river that is flowing to the east at a speed of 1.4 m/s. Mary can row the boat with a speed of 2.0 m relative to the water. 1. How long does it take Mary to reach the opposite river bank ? 2.If Mary rows straight north, how far ...
*September 15, 2010*

**Chemistry**

How many moles of H2 can be produced from 7.74g SrH2? equation:SrH2 + 2H2O = Sr(OH)2 + 2H2
*September 14, 2010*

**Physical chemistry**

Calculate the pressure exerted by 1.0 mol C2H6 behaving as a perfect gas
*September 13, 2010*

**Calculus**

If h(t) represents the height of an object above ground level at time t and h(t) is given by h(t)=-16t2+11t+1 find the height of the object at the time when the speed is zero.
*September 13, 2010*

**Calculus**

ignore the "d=". Sorry!
*September 13, 2010*

**Calculus**

Let F(s)=5s2+5s+4 . Find a value of d greater than 0 such that the average rate of change of F(s) from 0 to d equals the instantaneous rate of change of F(s) at s=1. d=
*September 13, 2010*

**Chemistry**

I am really having trouble answering this question, can someone help? A binary compound between an unknown element E and hydrogen contains 91.27% E and 8.73% H by mass. If the formula of the compound is E3H8, calculate the atomic mass of E.
*September 12, 2010*

**Chemistry**

Fungal laccase, a blue protein found in wood-rotting fungi, is 0.390% Cu by mass. If a fungal laccase molecule contains four copper atoms, what is the molar mass of fungal laccase?
*September 11, 2010*

**Chemistry**

Consider equation 3A+B=C+D. You react 4 moles of A with 2 moles of B. Which of the following is true? 1) Limiting reactant (L.R.) is one with higher molar mass 2) A is L.R. because you need 6 moles of A and have only 4 moles 3) B is L.R. because you have fewer moles of B than ...
*September 11, 2010*

**ELAC**

Consider equation 3A+B=C+D. You react 4 moles of A with 2 moles of B. Which of the following is true? 1) L.R. is one with higher molar mass 2) A is L.R. because you need 6 moles of A and have only 4 moles 3) B is L.R. because you have fewer moles of B than A 4) B is L.R. ...
*September 11, 2010*

**9th grade math**

x to the 2nd power if x = 3/4 how do you find 3/4th to the 2nd power? 3/4th times 3/4th right? so the answer would be 9/16ths.. right?
*September 9, 2010*

**math**

You drove 2695 miles in 35 hours. (1) What is your average rate of change? (2) Suppose you can drive that distance at a legal 75 mile per hour rate. How long should it take you to complete the trip? (3) Suppose you are driving that distance at an illegal 86.8 miles per hour ...
*September 7, 2010*

**College Mathematics**

You drove 2695 miles in 35 hours. (1) What is your average rate of change? (2) Suppose you can drive that distance at a legal 75 mile per hour rate. How long should it take you to complete the trip? (3) Suppose you are driving that distance at an illegal 86.8 miles per hour ...
*September 7, 2010*

**algebra**

a student writes 5y.3 to model the relationship the sum of 5y and 3.explain the error
*August 29, 2010*

**The elements and Principles of Design**

9-D just took the test
*August 19, 2010*

**Math**

How do you do a division problem?
*August 16, 2010*

**pre-algebra**

2/x-5=1/x+2 the teacher said i got it wrong when i got -1/7 he got -9 if that is please explain.
*August 2, 2010*

**accoutning**

what is an advantage of the partnership form of business organization is? 1. unlimited liability 2. mutual agency 3. ease of formation 4. limited life
*July 30, 2010*

**Math-Stats**

The Acme Candy Company claims that 60% of the jawbreakers it produces weigh more than .4 ounces. Suppose that 800 jawbreakers are selected at random from the production lines. Would it be unusual for this sample of 800 to contain 418 jawbreakers that weigh more than .4 ounces?
*July 28, 2010*

**geometry**

you are building a ramp that will be in the shape of a perfect right-angled triangle. The vertical height of th ramp will be 10 feet. the horizontal base of the ramp will be 15 feet. what will be the length of the downward sloping side of the ramp?
*July 8, 2010*

**Chemistry**

Write the chemical formulas for the compounds containing each of the following: a) one calcium atom for every two iodide atoms. b) two nitrogen atoms for every four oxygen atoms. c) one silicon atom for every two oxygen atoms. d) one zinc atom for every two chlorine atoms
*July 1, 2010*

**Chemistry**

Write the chemical formulas for the compounds containing each of the following: a) one calcium atom for every two iodide atoms. b) two nitrogen atoms for every four oxygen atoms. c) one silicon atom for every two oxygen atoms. d) one zinc atom for every two chlorine atoms
*July 1, 2010*

**Statistics**

Using the major League Baseball Data set available through the "Data Sets" lin in the materials section, answer the research question of whether the number of wins of a team can be explained linearly by the size of stadium, ERA, and stolen bases. Prepare a 750-1,050 ...
*June 30, 2010*

**algebra**

1800 kilometers ?
*June 22, 2010*

**algebra**

A stack of $10 bills is worth $90 billion dollars. What is the height of the stack in kilometers? Assume each bill is .2 millimeters high.
*June 22, 2010*

**math**

how long will it take for $7600 to double if invested at 4.2%,componded continously
*June 18, 2010*

**business**

Ziggy’s Famous Yogurt blends regular yogurt that is 3% fat with its no-fat yogurt to obtain lowfat yogurt that is 1% fat. How many pounds of regular yogurt and how many pounds of no-fat yogurt should be mixed to obtain 60 pounds of low-fat yogurt
*June 15, 2010*

**business**

Donna invested her $33,000 bonus and received a total of $970 in interest after one year. If part of the money returned 4% and the remainder 2.25%, then how much did she invest at each rate
*June 15, 2010*

**Science**

If neons atomic number is 10 how many electrons are in the outer energy level?
*June 10, 2010*

**math**

An actuary at an insurance company estimates from exsiting data that on a $1000 policy an average 1 and 100 policyholders will file a 20000 claim. in average of 1 in 200 policyolders will file a 50000 claim in average 1 in 500 policyholders will file a 100000 claim. a. what is...
*May 22, 2010*

**statistical reasioning**

An actuary at an insurance company estimates from exsiting data that on a $1000 policy an average 1 and 100 policyholders will file a 20000 claim. in average of 1 in 200 policyolders will file a 50000 claim in average 1 in 500 policyholders will file a 100000 claim. a. what is...
*May 21, 2010*

**technolgy and society**

one skill that's generally expected of technology workers is
*May 16, 2010*

**Geography**

What geographic features might create differences in France's and Germany's economies?
*May 13, 2010*

**Math**

A pan of cold water with a temeprature of 35 degrees F is brought into a room with a temperature of 75 degrees F. After one hour, the temperature in the pan is 45 degrees F. a) Write a formula for the temperature (T) as a function of time (according to Newton's Law of ...
*May 12, 2010*

**geography**

Germany and France are located next to eachother. What geographic advantages do they have in common that would help their economies prosper? what geographic features might create differences in their economies?
*May 10, 2010*

**chem**

Use this percentage to calculate the mass of fluorine in grams contained in 29.0 g of copper (II) fluoride
*April 25, 2010*

**english**

using these words : animate, dogged, gravity,indomitable,retaliate 1.This is what people do by dettling a score, getting even, and given other people a dose of their own medicine. which word describes this
*April 15, 2010*

**organic chemistry**

if sodium iodoacetate is used instead of sodium chloroacetate, how will the rate of reaction be affected? explain.
*April 14, 2010*

**Mathematic**

v-8<35
*April 13, 2010*

**3rd grade**

one dividend in my fact family is 18 one of my divisors is twice one of myquotients what three numbers are in my fact family
*April 1, 2010*

**Organic Chemistry**

When 2-methyl-2-butene is bubbled into dilute sulfuric acid at room temperature, it appears to dissolve. what new substance has been formed?
*March 30, 2010*

**Chemistry**

Calculate the electrical voltage of an electrochemical cell using Pb(s) and Co(s) as electrodes along with their appropriate solutions. Co2+(aq) + 2e- --> Co(s) -0.28 V Pb2+(aq) + 2e- --> Pb(s) -0.13 V The oxidation reaction is Co(s) --> Co2+(aq) + 2e- +0.28V E0 net(...
*March 18, 2010*

**Chemistry**

What does it mean to have a percent yield over 100?
*March 5, 2010*

**Psychology 202**

Neurologists involved in animal research studies of cognitive function see analogies in humans that suggest mental exercise reduces loss of brain mass. Which of the following statements describe their findings? (Points :1) Older adults who continue complex mental activities ...
*March 4, 2010*

**pre algabra**

-4(-3x+5y+5)+7(5x+2y-1)
*February 23, 2010*

**Child Day Care Management**

It's playing 20 questions. I took the same test. :)
*February 22, 2010*

**Algebra 2**

write the sum using summation notation 1+6+13+22+33
*February 21, 2010*

**Physics**

the weight of the box is mg so ( 32x9.81) In order to find the coefficient of static friction you need the normal force. If you draw out component vectors for the weight you will get: ycomp: (mg)cos23.2=288.53. xcomp: mgsin23.2=123.66 If you drew it out correctly you will see ...
*February 14, 2010*

**eng**

true or false act 1 1 Macbeth has just defended Kingduncan in a war. 2 the title,the thane of Cawdor, was given to Macbeth 3 Banquo notices Macbethsuneasy reaction to the witches' prophecies
*February 2, 2010*

**chemistry**

how do I convert 25.0 miles to kilometers
*January 26, 2010*

**psychology**

what is an example of effort justification
*January 24, 2010*

**psychology**

give and example of drive reduction and include homeostasis in your answer i can't figure this out can you help
*January 23, 2010*

**organic chemistry**

in figuring the percent yield of isoborneol reduced from camphor...is the ratio 1:1, i can do the calculations if i could determine this
*January 22, 2010*

**Chemistry**

An aqueous CaCl_2 solution has a vapor pressure of 82.1mmHg at 50C. The vapor pressure of pure water at this temperature is 92.6mmHg. What is the concentration of CaCl_2 in mass percent?
*January 20, 2010*

**math**

What is the difference between domain and range? Describe a real-life situation that could be modeled by a function
*January 12, 2010*

**Algebra**

What is the difference between domain and range? Describe a real-life situation that could be modeled by a function
*January 12, 2010*

**algebra**

What is the difference between domain and range? Describe a real-life situation that could be modeled by a function
*January 12, 2010*

**algebra**

-16x+y=3
*January 12, 2010*

**algebra**

Your company is planning to spend no less than $80,000 and no more than $100,000 on a landscaping project, which will be used as a promotional park that promotes your toaster manufacturing company. Write an inequality with a variable that demonstrates how much money your ...
*January 12, 2010*

**Accounting**

6. Morris Company has wages of $800,000, federal withholding is 25%, state withholding is 3.4%, and FICA withholding is 7.65%. What is the journal entry to record these wages?
*December 14, 2009*

**Math**

Find the area under the standard normal curve to the right of z = -1.25.
*December 9, 2009*

**riddles**

which of the sentences given below means approximately the same as:"beauty is only skin deep"? a )some actresses are made up by the studios so that you cannot tell what they really look like b ) don't judge a book by its over c) some people have prettier ...
*December 9, 2009*

**chemistry**

While in Europe, if you drive 115 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 40.0 mi/gal?
*December 9, 2009*

**chemistry**

In Europe, gasoline efficiency is measured in . If your car's gas mileage is 20.0 km/l, how many liters of gasoline would you need to buy to complete a 142km trip in Europe?
*December 9, 2009*

**12th Physics**

A 55 kg ice skater is at rest on a flat skating rink. A 198 N horizontal forceis needed to set the skater in motion.However, after the skater is inmotion, a horizontal force of 175 N keeps the skater moving at a constantvelocity. Find the coefficients of static and kinetic ...
*December 8, 2009*

**physics**

A 6.0 kg object undergoes an acceleration of 2.0 m/s2.a. What is the magnitude of the net force acting on the object?b. If this same force is applied to a 4.0 kg object, what acceleration isproduced?
*December 3, 2009*

**Chemistry 2**

You have a stock solution of 15.0 M NH3 . How many milliliters of this solution should you dilute to make 1200ml of 0.280 M NH3? If you take a 15.0ml- portion of the stock solution and dilute it to a total volume of 0.600 L , what will be the concentration of the final ...
*December 3, 2009*

**Chemistry**

You have a stock solution of 15.0 M NH3 . How many milliliters of this solution should you dilute to make 1200ml of 0.280 M NH3 ?
*December 3, 2009*

**physics**

A soccer ball kicked with a force of 13.5 N accelerates at 6.5 m/s2 to theright.What is the mass of the ball
*December 2, 2009*

**5th grade**

what is 2cm 72mm plus 69mm
*November 30, 2009*

**Chemistry**

Is potassium citrate ionic compound or molecular compound?
*November 28, 2009*

**history**

what are Democrats views on health insurance? what are the republican views on health insurance? please list some examples in sentences for both
*November 24, 2009*

**history**

what is reppublicans view on stem- cell research describe it 3-5 sentences PLEASE help
*November 23, 2009*

**history**

what are republicans view on social security. please helppp This is what i have so far:Workers will have choice to invest their payroll taxes. Anyone currently receiving Social Security, or close to it, will not be impacted by any changes.Today’s workers should be free to...
*November 22, 2009*

**history**

republican veiw on the iraq war
*November 21, 2009*

**history**

can you give me some more info
*November 21, 2009*

**history**

what is the republican view on the war in iraq
*November 21, 2009*

**COM 150 Effective Essay Writing**

How does the writing process you read about differ from the process you have used in the past? Wheich steop in the writing process is easiest for you to complete?
*November 13, 2009*

**algebra**

the profit made fram the sale of a dvd players from a company is found by subtracting the costs from the revenue. p=r+-c. Suppose that the companys revenue can be expressed with the function R(x)=x^2+59x and that the total costs for the company can be determined by the ...
*November 9, 2009*

**social studies **

how can i find an essay about media manipulation? or can you write ?
*November 9, 2009*

**algebra**

Marcella and Rupert bought party stuff. Marcella bought 3 packs of ballooons and 4 packs of favors for a total of $14.63. Rupert bought 2 packs of balloons and 5 packs of favors for a total or $16.03. Find the price of each and write a system of equations to model this.
*November 8, 2009*

**A.P American Government**

What are some of the significant committees in the House and the Senate.
*November 4, 2009*

**Mnagerial Economics**

I don't understand what is meant by returns to variable inputs. If you can expalin, I can do the rest.
*November 3, 2009*

**Mnagerial Economics**

prepare a brief, with the aid of diagrams how can knowledge of returns to variable inputs assist in decision-making in business
*November 3, 2009*

**math**

5x4+1=25
*November 2, 2009*

**algebra**

simplify: (p^-4+m p^2m)^-4 ________________ (p^-4)^-m
*November 1, 2009*

**math**

what is 96=6x^2 come out to be. im stuck!
*October 31, 2009*

**Health care**

identify and describe three causes for the increasing costs of health care. What impact does each of these causes have on socitey?
*October 30, 2009*

**science**

the _____ equator is at the 0 degrees latitude. the _______ equator is an imaginary line marking the tempeture equilibrium between the hemispheres
*October 28, 2009*

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