Sunday

August 30, 2015
Total # Posts: 448

**Chemistry **

a.) Caculate the energy of light emitted when an electron moves from n=2 to n=1 in the hydrogen atom. b.) Caculate the energy of light emitted when an electron moves from n=4 to n=2 in the hydrogen atom. c.) How many total different light energies can be emitted from an ...
*January 19, 2013*

**math**

For how many positive integers n does n! end in exactly 5 0s?
*January 10, 2013*

**math**

For how many positive integers n does n! end in exactly 5 0s?
*January 10, 2013*

**math**

What is the simplified form of the square root of 8x^5?
*January 5, 2013*

**math**

What is the simlified form of the square root of 8x^5?
*January 4, 2013*

**math**

You draw 2 marbles from a bag containing 3 blue marbles, 2 green marbles, and 5 red marbles without replacement. What is the probability of drawing a red marble and then a green marble?
*January 4, 2013*

**Physics - Heat Transfer**

aaaaaaaaahhhh. got it. you have to add them and set them equal to zero.
*December 6, 2012*

**Physics - Heat Transfer**

I am trying to calculate heat transfer between two objects. The units are as follows: m1: 100 g t1: 10 degrees C spec heat 1: 1.00 cal/g degree C m2: 200 g t2: 90 degrees C spec heat 2: 0.2 cal/gm degree C I set Q1 = Q2 m1 x spec heat 1 x delta T1 = m2 x spec heat 2 x delta T2...
*December 6, 2012*

**Physics - Unit Conversion**

I am trying to calculate heat transfer between two objects. The units are as follows: mass: grams specific heat: cal/gm degree celsius temperature: degree celcius My numbers aren't working out and I know how to do the problem. So, what's the deal with the gm. Is that ...
*December 4, 2012*

**physics**

1/200 = 0.005 meters / rad pi rad / node x 0.005 meters / rad = 0.0157 m / node
*November 20, 2012*

**Math**

(4.5 km/hr x X) + (3.5 km/hr x Y) = 40 Where X is the time there and Y is your time back. X = (40 - 3.5 Y) / 4.5 = 8.88 - 0.77Y Now plug X back into your original eqn and solve for Y: 4.5 (8.88 - 0.77Y) + 3.5Y = 40 Got it?
*November 19, 2012*

**Physics**

I think you solve it like this...do you have the answer to verify? I am no genius in physics... Forces in the x direction = friction = mass x acceleration. friction forces is found by multiplying the coefficient of friction (u) by the normal force. so. -u x mass x gravity = ...
*November 17, 2012*

**Physics**

ok. thanks.
*November 17, 2012*

**Physics**

Won't the amplitude and period be greater at a maximum?? Do you know why we can use the given values??? As far as I can tell, we assume that 0.6 and 4.1 are maximums...I am not following. This gives me the correct answer, so, I guess I'm not understanding the equation ...
*November 17, 2012*

**Physics**

The period of oscillation of a spring-and-mass system is 0.60 s and the amplitude is 4.1 cm. What is the magnitude of the acceleration at the point of maximum extension of the spring? I have too many unknowns to use the equation for frequency, period, acceleration, velocity. ...
*November 17, 2012*

**Physics (maybe it's just math)**

A sphere of copper is subjected to 89.7 MPa of pressure. The bulk modulus is 130 GPa. a) By what fraction does the volume of the sphere change? b) By what fraction does the radius of the sphere change? for a) I have dV/V = 0.00069 - this is correct. for b) the area I have 4/3 ...
*November 17, 2012*

**physich**

initial momentum = final momentum m1v1(initial) + m2v2(initial) = m1v1 (final) + m2v2 (final) Initial Final m1 = m m1 = m v1 = 280 m/s v1 = ? m2 = 16m m2 = 16m v2 = 0 v2 = ? Plug them in and cancel out your ms and solve for v1 or v2. Then go back and plug that solved value ...
*November 4, 2012*

**algebra**

35 cents to $2.20. Whats the question?
*November 4, 2012*

**Grand Canyon University**

Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.
*October 27, 2012*

**Economics**

Would Wells Fargo's market structure be Monopolistic competition?
*October 27, 2012*

**Physics**

I found the average acceleration of earths orbit around the sun over a period of 5 days by calculating delta theta and dividing by radius and 1/T. I got the right answer but as I am studying for my test, I am seeing the units do not work...does this make sense? Can someone ...
*October 24, 2012*

**Chemistry**

In the experiment 0.500 g of copper reacted with oxygen to give 0.563 g of copper oxide. What is the empirical formula of the oxide expressed as a chemical formula?
*October 24, 2012*

**Physics**

How do I find the instantaneous acceleration of the earth orbiting the sun? Everything I am trying is incorrect. I am using 1 second as my time and get 1.99E-7 rads/second. First I tried: acceleration = theta x t / radius Where: theta = 1.99E-7 rads radius = 6.371E6 Then I ...
*October 23, 2012*

**Physics**

Trying to find escape speed from a planet and I am given the radius and gravitational field - g = 18 m/s^2. I have the conservation of energy, final energy is zero, I have the formula for V = sqrt 2GM/r, u = mgy. I have too many unknowns...I can't solve anything. What am I...
*October 23, 2012*

**Chemistry**

hmm. I'm a bit stumped. Why did the instructions say it is not a simple mol/L calculation? You must have the quantity of the acetone/impurity mix? At that point, you could simply say that you have so many grams / L of acetone. But, since it's not a straight calculation...
*October 23, 2012*

**Chemistry**

hmm. I think you're leaving information out. Concentration is found by mass of acetone / volume liquid. Dividing initial volume by final volume leaves you with a unitless number - the percent of impurities maybe, and this isn't helping your case. You should have pretty...
*October 23, 2012*

**statistics**

.08 is the probability for defective parts.
*October 20, 2012*

**statistics**

Suppose a shipment of 500 machine parts contains 62 defective and 438 non-defective machine parts. From the shipment you take a random sample of 25. You are interested in the number of defective machine parts out of 25 trials and corresponding probabilities. I believe the ...
*October 20, 2012*

**Physics**

I am grazing for answers because I spent 5 hours or more manipulating basically 1 equation and plugging in numbers to no avail. I was using my e^x function as 10^x. 8-/
*September 29, 2012*

**Physics**

A spy satellite is in circular orbit around Earth. It makes one revolution in 6.01 hours. (a) How high above Earth's surface is the satellite? [Answer in Km] (b) What is the satellite's acceleration? [Answer in m/s^2] I see this posted over and over again and I have ...
*September 29, 2012*

**physics**

A large air-filled rubber ball is tethered to the bottom of a swimming pool. The tension in the tether is 100N. The mass of the rubber in the ball itself is 2kg while pwater=1000kgm(-3) and pair=1.2 kgm(-3). What is the volume of the ball?
*September 27, 2012*

**Physics**

A boy wishes to row across a river in the shortest possible time. He can row at 2m/s in still water and the river is flowing at 1m/s. At what angle should he point th efront of his boat? The answer is 90 degrees but I dont understand how to solve the problem using the velocity...
*September 23, 2012*

**ashford university**

"Exercise 16-3 Determining the present value of a lump-sum future cash receipt Marsha Bittner expects to receive a $600,000 cash benefit when she retires five years from today. Ms. Bittner’s employer has offered an early retirement incentive by agreeing to pay her $...
*September 12, 2012*

**math**

The population of a town is given by P =350t + 5000, where t is years after 1980. Teh input variable is what? and the Outpur variable is what? the ordered pairs are in the form of what. and what is the meanng of P(0) = 85000 in the context of this problem
*September 9, 2012*

**medical transcription**

He has, on physical examination, many erythematous actinic keratosis still present on the forearm. They are flat, but these are much less than before. He has, in addition, on his buttocks, 2 lichenified areas of erythema bilaterally on the buttocks where he sits.
*August 28, 2012*

**omm 612612 Managing in Social Change **

If you could choose between what we called the Anglo-American political economy and the continental European model of political economy, which would you prefer? Why?
*August 21, 2012*

**macroeconomics**

evaluate expectations through a Keynesian perspective or classical perspective. I need help figuring out how to do this.
*August 19, 2012*

**Principles of Macroeconomics**

Describe how expectations affects aggregate supply and demand through a classical perspective or keynesian perspective
*August 19, 2012*

**math**

In a scaled drawing 1/3 of an inch represents 6 feet how many inches represent 54 feet
*August 7, 2012*

**business**

I am having problems understanding cost variance model; Can you give me a simplyfied formula to determine budgetary variance models? I have an example.
*July 22, 2012*

**Healthcare Finance**

Metropolis Health System has received a wellness grant from the charitable arm of an area electronics company. The grant will run for twenty-four months, beginning at the first of the next fiscal year. Two therapists and two registered nurses will each be spending half of ...
*July 18, 2012*

**business finance**

HELP ME GET STARTED ON THIS. I don't know what to do with the estimated demande & probability. This requires managers to estimate demand for the new product and assign probabilities. A range, rather than only one goal will be established. The first strategy is to set a ...
*July 4, 2012*

**Accounting**

A meeting of senior managers at the Pringly Division has been called to discuss the pricing strategy for a new product. Part of the discussion will focus on estimating sales for the new product. Over the past years, a number of new products have failed to meet their sales ...
*July 2, 2012*

**Consumer math !!!! please check**

Are the answers right or wrong above?
*May 24, 2012*

**dressmaking**

can someone help me check my 4 answers to examination 042025000 thank you!!
*May 22, 2012*

**dressmaking**

EXAMINATION 04202500 ALTERATIONS AND FITTING I NEED TO CHECK 5 ANSWER, (1) The shoulder seam of the garment with a set-in sleeve is usually located so that it is (A) easily seen in a straight back view, (b) clearly visible in a straight front view.(C)in line with the underarm ...
*May 22, 2012*

**Intermediate Algebra**

Essay: show all work. Find the quotient: 49a^2-b^2/7a-b
*May 22, 2012*

**earth**

If a satalite weighs 90 kg at 10000 miles from the earth, how far away is it when it weighs 10 kg?
*April 12, 2012*

**Economics**

A. :) ....whell yeea
*March 28, 2012*

**math**

a square playground has area of 174 m2 .what is the approximate lenght of each side of the playground?
*March 10, 2012*

**business**

Which economic system is the best solution to handling a crisis of epic proportion
*March 4, 2012*

**algebra**

simplify 8-2(n+4)(-3)^2
*February 21, 2012*

**Math**

100+8x = 75+10x 100-75 = 10x-8x 25 = 2x /2 /2 12.5 = x If you order 12.5 squares, the cost will be the same!!!
*February 21, 2012*

**sales tax**

How much tax is there on 268.00 @6%
*February 11, 2012*

**business**

Can somebody explain what organizational structure of a company means? I read the definitions, but I still do not understand it.
*January 29, 2012*

**algebra**

r/3+7=-4?
*January 26, 2012*

**math 121**

1. A college offers three different psycology . courses, four different history courses, and six different business courses. If a student is required to take one course in each of those three subjects, how many different ways are there for the student to fulfill this ...
*January 24, 2012*

**algebra**

0.15x+55>0.10x+80 how do i work this out?
*January 16, 2012*

**Programming**

Write a program that inputs (from the user) the number of hours worked and hourly rate for employees and outputs the total pay. The program should process an arbitrary number of employees; the user will terminate input by entering 0 hours worked and pay rate. Use a class ...
*January 10, 2012*

**7th gr math proportional relationships**

music down loads cost .95 cents each . is this a proportional relationship?
*January 2, 2012*

**chemistry**

What is the molarity of a salt water solution containing 8moles of salt in 2 L of solution?
*December 27, 2011*

**English**

Which marks of punctuation would be appropriate to set off the italicized words in the following sentence? One day my dad and his brother stop me if you've heard this story started out on what they thought would be an uneventful drive to work.
*December 19, 2011*

**algebra**

question can u answer 6x + 12 = 30
*December 13, 2011*

**can you please look over my answers? clauses**

Select the abbreviation that tells how the italicized noun clause is used. S-subject, DO-direct object, SC-subject complement, OP-object of preposition The valedictory prize will be awarded to whoever has the highest academic rating. {{who ever has the highest academic rating...
*December 11, 2011*

**English **

Select the abbreviation that tells how the italicized noun clause is used. S-subject, DO-direct object, SC-subject complement, OP-object of preposition What I had been hoping for was a scholarship.
*December 11, 2011*

**PREALGEBRA**

-N/16 - N/16
*December 8, 2011*

**PREALGEBRA**

MATH QUESTION SOLVE 2 1/3 - 1 1/2
*December 8, 2011*

**math**

Given the following information, determine the sample size needed if the standard time estimate is to be within 5 percent of the true mean 99 percent of the time. Work Element Standard Deviation (minutes) Mean Observed Time (minutes) 1 0.20 1.10 2 0.10 0.80 3 0.15 0.90 4 0.10 ...
*December 3, 2011*

**statistics**

Tax Preparers Inc. works 250 days per year. The company uses adding machine tape at a rate of eight rolls per day. Usage is believed to be normally distributed with a standard deviation of three rolls during lead time. The cost of ordering the tape is $10 and holding costs ...
*December 1, 2011*

**Statistics**

University Hospital has been concerned with the number of errors found in its billing statements to patients. An audit of 100 bills per week over the past twelve weeks revealed the following number of errors: Week Number of Errors 1 4 2 5 3 6 4 6 5 3 6 2 7 6 8 7 9 3 10 4 11 3 ...
*November 12, 2011*

**statistics**

Chapter 06, Problem 8 A tire manufacturer has been concerned about the number of defective tires found recently. In order to evaluate the true magnitude of the problem, a production manager selected ten random samples of twenty units each for inspection. The number of ...
*November 12, 2011*

**Science**

Calulate the force needed to accelerate a 2,300 kg mass at 5.5m/s/s acceleration.
*November 7, 2011*

**business writing**

I have to write a business letter, a memo and an e-mail on one document regarding human resources administrative assistant organizing seminar on sexual harrassment.
*November 2, 2011*

**Hospitality & Tourism**

1. Create a rank-ordered list of best practices concerning total quality management (TQM) that would be applicable to all hotels. Please provide specific examples. 2. From the perspective of hotel management, determine which aspect of managing employees has the biggest single ...
*November 1, 2011*

**geometry **

draw two points r and s then sketch rs add a point t on ray so that s is beetween r and t
*October 20, 2011*

**Chemistry 105**

134 are redox
*October 10, 2011*

**Algebra**

Maria bicycles 8km/h faster than Dennis. In the same time it takes Dennis to bicycle 33km, Maria can bicycle 37km. How fast does each bicyclist travel?
*October 7, 2011*

**Chemistry**

NaCl is soluble in water, but I2 is not. Explain
*October 7, 2011*

**Statistics**

the diameter of grapefruits in a certain orchard are normally distributed with a mean of 6.10 inches and standard deviation of 0.40 inches, what is the percentage of the grapefruits in this orchard have diameters less than 6.8 inches and what percentage are larger than 6.7 inches
*October 7, 2011*

**algebra/geometry**

what is the area of a triangle 8'. tall with a 6". base, sitting on 1/2 a circle
*September 23, 2011*

**Economics**

What is the difference between microeconomics and macroeconomics? Discuss and contrast the two theories.
*September 20, 2011*

**chemistry**

a 52g piece of ice at 0 degree is added to a sample of water at 6 degree all the ice melts and the temp of the water decreases to 0 degrees how many grams of water were in the sample?
*September 17, 2011*

**History**

The biography of nelson mandela
*September 11, 2011*

**Life orientation**

-what are the causes of and how to prevent cancer
*September 11, 2011*

**algebra/geometry**

which of the following shows the correct way to write an ordered pair of coordinates. (3,2). x=3,y=2. 3,2. (x=3)(y=2)
*September 8, 2011*

**civics**

why do we have 5 territories spread around the world?
*August 30, 2011*

**history**

I dont understand the question
*August 28, 2011*

**Algebra**

If the cost of a cell phone has decreased 400% during the past 10 years, does that correspond to a cost decrease of four times? Explain your answer as though you were talking to someone who has never taken algebra.
*June 15, 2011*

**com/220**

Need a thesis and a full sentence outline. Original thesis is to long. I am doing a paper on wiki leaks, I have information on Julian Assange and Bradley Manning. I need it by this afternoon if possible.I would like to make my argument why leak important information.
*May 31, 2011*

**Geometry**

if a quadrilateral has both pair of base angles congruent---- can you prove that the shape is a trapezid
*May 24, 2011*

**Pre-algebra**

SOLVE THIS PROBLEM 2 1/3 - 1 1/2
*May 21, 2011*

**writing**

The way it is worded is the reason I don't understand the assignment.
*May 20, 2011*

**writing**

I need a bit more help than this.
*May 20, 2011*

**writing**

I was wondering if some1 could help me in the right direction with this assignment. Background Ten years ago, you started working as a clerk for DMD Medical Supplies. Six months ago, Liz Jakowski, the human resources director, promoted you to office manager. You manage two ...
*May 20, 2011*

**Tables**

How to do a table with fractions,decimals,and percents
*May 18, 2011*

**science**

What does effect of negatively charged Object on positively charged object mean
*May 16, 2011*

**algebra**

Â¿como se desarrolla? lo siguiente: log(x-7/x-1)=1/2 lo antes posible por favor.
*May 9, 2011*

**College Math**

Lottery: One million tickets were sold for a lottery in which a single prize will be awarded. a)If you purchase a ticket, determine your odds against winning. b)If you purchase 10 tickets, determine your odds against winning.
*April 18, 2011*

**statistics**

Suppose that 62 percent of the people who are murdered actually knew the person who committed the murder. Suppose that a detective file in Boston has 62 current unsolved murders. What is the probability that fewer than 33 victims did not know their murderer? A) .993 B) .007 C...
*April 17, 2011*

**Statistics**

Suppose that more than a decade ago high levels of lead in the blood put 81 percent of children at risk. A concerted effort was made to remove lead from the environment. Suppose, according to a survey, only 5 percent of children in the United States are at risk of high blood-...
*April 17, 2011*