Thursday

July 2, 2015

July 2, 2015

Total # Posts: 1,336

**Physics**

A source of sound (1140Hz) emits uniformly in all directions. An observer 3.09m from the source measures a sound level of 38.2dB. Calculate the average power output of the source.
*November 30, 2012*

**Physical science**

Physical science a 2.0g metal ball that carries a charge of 10 uC is placed into an electric field. the ball at rest at point A is accelerated to point B with a speed of 1.0 m/s. what is the electric potential difference between point A and point B?
*November 25, 2012*

**^th grade math,**

using mental math and distributive property solve: 25(12)
*November 15, 2012*

**Physics HELP!!**

A square, 0.74m on a side, is mounted so that it can rotate about an axis that passes through the center of the square. This axis is perpendicular to the plane of the square. A force of 26.8N lies in this plane and is applied to the square. What is the magnitude of the maximum...
*November 12, 2012*

**Physics HELP!!**

A lower 0.56m long leg is being exercised. It has a 48.0N weight attached to the foot and is extended at an angle θ with respect to the vertical. Consider a rotation axis at the knee. At what angle θ does the magnitude of the torque equal 14.2 N-m?
*November 12, 2012*

**chemistry**

what elements follow the octet rule?
*November 9, 2012*

**chemistry... HELP !!!!!!!**

For the reaction 2Co^3+ (aq) + 2Cl^- (aq) ----> 2Co^2+ + Cl2 (g) E^o = 0.46 V (STANDARD cell potential) what is the cell potential at (25 deg C) if the concentrations are [Co^3+] = 0.651M , [Co^2+]= 0.846 M, and [Cl^-] = 0.636 M and the pressure of Cl2 is PCl2= 9.30 atm ?
*November 5, 2012*

**chemistry... HELPP**

A gaseous reaction occurs at a constant pressure of 45.0 atm and releases 62.5 Kj of heat. Before the reaction, the volume of the system was 8.60 L . After the reaction, the volume of the system was 3.00 L. Calculate the total internal energy change in kilojoules.
*November 5, 2012*

**chemistry... HELP**

Equilibrium constant question!!!? Standard reduction potentials Reduction half-reaction E(V) Ag+(aq) + e- ---> Ag (s) 0.80 Cu ^2+ (aq) + 2e- ---> Cu (s) 0.34 Sn^4+(aq) + 4e- ---> Sn (s) 0.15 2 H+(aq) + 2e- ---> H2 (g) 0 Ni^2+(aq) + 2e- ---> Ni (s) -0.26 Fe^2+ (...
*November 3, 2012*

**chemistry**

The standard reduction potentials of lithium metal and chlorine gas are as follows: (for Li, reduction potential is -3.04, for Cl it is 1.36) In a galvanic cell, the two half-reactions combine to 2Li{+](s) + Cl{-}2(g) --> 2Li{+}Cl{-}(aq) cell potential=4.4 V Calculate the ...
*November 3, 2012*

** working with children from culturally diverse **

which cultures are most closely aligned in valuing dependence over autonomy? American mainstream and Native American or Mexican American and Native American
*November 1, 2012*

**science**

If Wire A has a poterntial difference of 50V across it and carries a current of 2A. Wire B has a potential difference of 100V across it and also carries a current of 2A. Compare the resistances, rate of flow of charge, and rate of flow of energy in the two wires?
*October 30, 2012*

**Internet Server Environments**

What is Cold FusionMX and how would you accommodate on a Windows 2000 server?
*October 28, 2012*

**writing**

Could you please proofread this along with punctuation. It's an essay and it will be doubled spaced when I submit it. Thank you In approximately 200–350 words, using compare/contrast strategies, discuss the benefits and/or advantages of shopping online, rather than ...
*October 25, 2012*

**English Language**

Yes,she is my cousin.- Is the comma identify as an introductory phrase?
*October 25, 2012*

**Physics HELP!!**

Forces of 11.1N north, 19.9N east, and 14.0N south are simultaneously applied to a 3.62kg mass as it rests on an air table. What is the magnitude of its acceleration? b) What is the direction of the acceleration in degrees? (Take east to be 0 degrees and counterclockwise to be...
*October 24, 2012*

**Physics HELP!!**

Two horizontal forces F1 and F2, are pulling an object of mass 3.05kg from two opposite sides. F1 pulls to the right and F2 pulls to the left. The magnitude of F1 is 99.2N. The object moves strictly along the horizontal x-axis, which we chose as positive to the right. Find the...
*October 24, 2012*

**MEC**

two charges repel each other with a force of 0.1N when they are 5cm apart. Find the forces between the same charges when they are 2cm and 8cm apart.
*October 24, 2012*

**math**

72-25
*October 23, 2012*

**Physics**

The forace exerted by the air The problem does not state units, this assuming the weight is Kg and acceration is m/s2 g = 9.8 a = .9 from Netwon law sum of force= ma helicopter weight + frame weight X g + frame weight X a= force exerted by air Force =(7900+1100) x 9.8 + (1100 ...
*October 23, 2012*

**English**

I have to write an essay showing the advantages to online shopping than store shopping. Is an essay doubled spaced?
*October 21, 2012*

**College Physics**

If Wire A has a poterntial difference of 50V across it and carries a current of 2A. Wire B has a potential difference of 100V across it and also carries a current of 2A. Compare the resistances, rate of flow of charge, and rate of flow of energy in the two wires?
*October 20, 2012*

**physics ..PLEASE HELP ASSIGN DUE SOON :(**

Three charges, q1=+45.9nC q2=+45.9nC and q3=+91.8nC are fixed at the corners of an equilateral triangle with a side length of 3.70cm. Find the magnitude of the electric force on q3.
*October 19, 2012*

**Math Grade 5**

Mr. Jacob is 55 years old and Tony is 7 years old. In how many years will Mr. Jacob be 4 times as old as Tony? Please help me solve this.
*October 19, 2012*

**Physics HELP!!**

Three point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of an equilateral triangle. The magnitude of each of the charges is 3.66 μC, and the lengths of the sides of a triangle are 2.15 cm. Calculate the ...
*October 17, 2012*

**Statistics**

Assume that the average annual salary for a worker in the United States is 300,000- and that the annual salaries For Americans are normally distributed with a standard deviation equal to $7,000. Find the following: A. What percentage of Americans earn below $22,000? B. What ...
*October 14, 2012*

**science**

Explain how to measure the volume of a rock by water displacement?
*October 12, 2012*

**science**

40 centimeters cubed of dry sand is added to a graduated cylinder containing water, the level of the liquid rose 15 centimeters cubed on the scale. What is the volume, in centimeters cubed of air in the sand?
*October 12, 2012*

**science**

A 10 centimeters cubed sample of salt having a mass of 8 grams is added to 20 centimeters cubed of water having a mass of 15 grams. What is the mass of the mixture?
*October 12, 2012*

**chemistry**

A sample of one liquid has a mass of 60 grams and a volume of 50 centimeters cubed; a sample of a second liquid has a mass of 30 grams and a volume of 40 centimeters cubed. They are put in a container and mixed. Can you determine what the mass and the volume of the mixture is?
*October 12, 2012*

**English1C**

I need help writing a fallacy essay about The Wrong InequalityBack to Article » By DAVID BROOKS
*October 12, 2012*

**math**

Please solve this word problem, It will take at least 360 points for Kiko"s team to win the math contest. The scores are 94,82, and 87, but one of Kiko's teammates lost 2 of those points for an incomplete answer. How many points must Kiko earn for her team to win the ...
*October 11, 2012*

**Math (kindergarten)**

39
*October 10, 2012*

**physics **

How do I find the acceleration on a velocity time graph when the graph has an irregular shape.
*October 7, 2012*

**math**

please help me solve , 1/8(x+230)=200
*October 6, 2012*

**physics**

A car traveling 28 mi/h accelerates uniformly for 6.7 s, covering 555 ft in this time. What was its acceleration? Answer in units of ft/s 2
*October 6, 2012*

**algebra**

What is a simpler form of the radical expression? ^4sqrt 81x^20 y^8 A, 3|x^5|y^2 B. 9|x^25|y^4 C. 9x^25|y^4| D. 3x^5|y^2|
*September 29, 2012*

**Physics**

367.5
*September 25, 2012*

**math**

dr.chen told miranda that her new puppy needs a diet that includes at least 1.54 ounces of protein and 0.56 ounce of fat each day to grow into a healthy dog. each cup of good start puppy food contains 0.84 ounce of protein and 0.12 ounce od fat. each cup of sirius puppy food ...
*September 20, 2012*

**chem**

what is the difference between a bunsen burner and a lab burner?
*September 18, 2012*

**physics**

6.6
*September 13, 2012*

**math**

5a-4=6a+12
*September 13, 2012*

**Psychology**

Where are selfish impulses? Examples of social conscience?
*September 11, 2012*

**math**

you invested $4000 in two accounts paying 2% and 9% annual interest, respectively if the total interest earned for the year was $150, how much was invested at each rate. $_was invested at 2% and _$ was invested at 9%
*September 11, 2012*

**math**

x+y+5z=18 x+y+7z=26 x-4y-7y=-35 its a solve a 3 equation solve the system
*September 11, 2012*

**Psychology**

Thank you, Ms. Sue.
*September 11, 2012*

**Psychology**

How do you think your psyche has evolved to meet the challenges of your society and culture in this time and place? Can some give me some examples so that I can get an idea?
*September 11, 2012*

**maths**

x+2a is a factor of (x^3+2(a-2b)x^2-b(8a-3b)x+6ab^2)
*September 10, 2012*

**ivy tech**

Assuming that the data are normally distributed with a mean of 45 and a standard deviation of 3.25, what is the z-score for a value of 40?
*August 30, 2012*

**budget**

budgeting should begin with
*August 28, 2012*

**Trigonometry**

Solve each triange given the indicated measures of angle and sides b=43degrees y=36 degrees a=92cm
*August 16, 2012*

**COMM 215**

When we drive in city traffic, you need to watch the traffic around your carefully. The choices are Pronoun shift in Number, Pronoun shift in Person, Ambiguous Reference, No Error. I picked Pronoun Shift in Person. Is this right?
*July 30, 2012*

**COMM 215**

The capitalized verb agrees with the subject: One of my friends LIKE this brand of coffee. It is True/False. I picked False.
*July 30, 2012*

**physical science**

what are the number of moles of phosphorus in 15 moles of Ca3(PO4)2
*July 26, 2012*

**mth 121**

can you fine the dimensions of a rectangle with a perimeter of 94cm if the length is 2 less than six times the width
*July 23, 2012*

**Statistics**

I know the formula. How do you work backwards?
*July 22, 2012*

**Statistics**

The confidence interval below for the population variance is based on the following sample statistics: n = 25, x-bar = 31.1, and s = 4.2. 9.29 < standard deviation squared < 42.82 What is the degree of confidence?
*July 22, 2012*

**Statistics**

No wonder I keep getting the wrong answer. Thank you so much for helping me how to get the answer. Now I know how to do the next problem which is similar to this problem.
*July 20, 2012*

**Statistics**

But, I'm suppose to use the normal distribution approximation to the binomial distribution.
*July 20, 2012*

**Statistics**

The probability that a radish seed will germinate is 0.6. Estimate the probability that of 130 randomly selected seeds, exactly 90 will germinate. Note: I keep getting the answer wrong.
*July 20, 2012*

**Chemistry**

Thanks
*July 18, 2012*

**Chemistry **

so would my answer be 15ml How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2
*July 18, 2012*

**Chemistry **

How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2 I still dont get it to i times .300x30.0 then times .300 x.15 i just dont understand what i am actually suppose to multiply
*July 18, 2012*

**Chemistry**

I still dont get it to i times .300x30.0 then times .300 x.15 i just dont understand what i am actually suppose to multiply
*July 18, 2012*

**Chemistry**

How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2
*July 18, 2012*

**english**

Do you think that paying attention to your audience, purpose, and content improves the influence of your writing? Why or why not?
*July 18, 2012*

**english**

Identify a serious error you find challenging to overcome in your own writing. What method will you use to avoid this error? Would you recommend the method to others? Why or why not?
*July 18, 2012*

**algebra**

Choose the best response to descrive the polynomial. -4x^3-2x^2+2x A) The coefficients are all negative B) The leading coefficient is negative C) It is a binomial D) It is of degree four. I was thinking it is c could someone tell me if I am right! Thanks!
*July 17, 2012*

**algebra**

Synthesis: Find a polynomial for the shaded area of each figure. 21t+8 is on top of the outer box and 4t is on the left side of the outer box. On the inter box there is 3t-4 and 2t on the left side of the inter box. the area between the outer box and the inter box is shaded. I...
*July 17, 2012*

**english**

D is the answer, collective noun is a special class, name groups [things] composed of members [usually people]. Examples: army audience,board,cabinet,class,committee, company,corporation etc...
*July 17, 2012*

**US History and Constition**

The Monroe Doctrine proclaimed that the Americas should be free from future European colonization and free from European interference in sovereign countries' affairs. It further stated the United States' intention to stay neutral in European wars and in wars between ...
*July 16, 2012*

**Algebra**

Simplify. Remember to use absoulute value notattion when necessary. If a root cannot be simplified state this. {(7b)exponent4}^(1/4) I did something wrong when I did it.
*July 15, 2012*

**math**

Calculate the monthly payment necessary to retire a 3-year simple-interest loan of $12,000 if the simple interest rate charged is 9%. Round your answer to the nearest cent.
*July 6, 2012*

**child care**

ans test003061 peen foster
*July 6, 2012*

**algebra**

Solve using the eliminattion method. Show your work. If the system has no solution or an infinite number of solution, state this. -2x-8y==42 -4x+6y=-18
*July 5, 2012*

**Algebra**

Solve using the elimiation method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x=6y= -2 -8x+6y= -26
*July 5, 2012*

**math**

Megan and Sam together take 12 minutes to wash a car. Washing the car by herself took Megan 21 minutes. How long would it take Sam to wash the car?
*July 4, 2012*

**algebra**

Solve using the elimination method. Show your work. If the system has not solution or an infinite number of solutions, state this. -2x-8y=-42 -4x+6y=-18
*July 3, 2012*

**algebra**

Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x-6y=2 -8x+6y=-26
*July 3, 2012*

**algebra**

solve 5x^2-11=0
*June 22, 2012*

**geometry**

is my answer correct, please? thanks very much M = measurement If M angle 1 = 60 degrees, then m angle 3 + m angle 5 = what is answer? i put 90 degree for angle 3 which is right angle + 60 degrees = 150 given: m angle 1 = m angle 5 in statements/reasons. diagram was + with ...
*June 20, 2012*

**geometry**

16.3 is the length of the base rounded to the nearest tenth. 3.14 x 7.5 x 7.5 x 12 = 2119.50 16.28 x 16.28 x 8 =2,120.3
*May 29, 2012*

**Math**

you've been to jog for 1 hr a day 3 times a wk, if you jog 5.5 miles per hr, how far will you jog each wk
*May 27, 2012*

**Science**

Suppose we allowed each person 1000m^3 of living space in a large building, with ceiling height 3 m. To the nearest order of magnitude, how many 1000m high buildings would have to be built to house the entire population of 8.5 x 10^14 people on the energy-limited Earth, if ...
*May 25, 2012*

**maths**

Water is leaking out of a barrel. In the first hour, it lost half the number of litres it held, plus one litre. In the second hour, it lost half the remainder plus another litre. In the third hour, it lost half the remainder again, plus a further litre; and during the fourth ...
*May 22, 2012*

**English**

Is the sentence We playes always score. correct or would you say Us players always score?
*May 21, 2012*

**english**

is my answer correct?
*May 21, 2012*

**english**

in a horse drawn wagon and modifies the word books
*May 21, 2012*

**english**

In the sentence Mary brought library books to them in a horse-drawn wagon. What is the prepositional phrase and the word it modifies?
*May 21, 2012*

**english**

I think it is in the early 1900's and the word it modifies is wagon
*May 21, 2012*

**english**

in the sentence She invented the book wagon in the early 1900's. what is the prepositional phrase and word it modifies?
*May 21, 2012*

**English**

in the sentence Mary Titcomb was a librarian from Maryland. What is the prepositional phrase and the word it modifies?
*May 21, 2012*

**AlgebraB**

Help! I have to graph my answer to this problem: ADFG has vertices D (–2, 4), F (–3,1), and G (–1, 2). Find the vertices of the image after the rotation of 180° about the origin.
*May 17, 2012*

**physics**

a small pith ball carries a charge of -1.3 uc. how many excess electrons does this represent?
*May 17, 2012*

**Physics**

Here's the question again that I am trying to get help with because I can't figure it out and I got one answer, but I really couldn't understand it. Help please! A ferris wheel makes one rotation in 15 minutes. Find your car's location and the angle of rotation...
*May 16, 2012*

**physics**

Thank you Elena. I really appreciate your halp.
*May 15, 2012*

**physics**

A ferris wheel makes one rotation in 15 minutes. Find your car's location and the angle of rotation after: 3 mins., 5 mins., 9 mins., 12 mins. The diameter of the wheel is 328 ft. and the height, with the base, is 369 ft.
*May 15, 2012*

**Pre Algebra**

Thanks PsyDAG. This was the very first ferris Wheel so that's why it was so big and held a lot of people. I wasn't given any other information.
*May 15, 2012*

**Pre Algebra**

Tickets on the ferris wheel cost .50 cents. At least how many tickets were sold? There are 36 cars on the ferris wheel that holds 60 people per car. Suppose every ticket holder rode for two turns of the wheel. At least how many turns did the wheel have to make? I think it'...
*May 15, 2012*