Friday

November 28, 2014

November 28, 2014

Total # Posts: 88

**physics**

it takes about 560 kilowatts to run a diesel locomotive at speed around 180km/h.Magnetically levitated trains(mag levs) on the other hand require less power because the magnetic levitation eliminates energy loss to friction.The worst maglev system requires 270 watts to ...
*November 23, 2014*

**physics**

The distance between two telephone poles is 54 m. When a 2.0 kg bird lands on the telephone wire midway between the poles, the wire sags 0.16 m. How much tension in the wire does the bird produce? Ignore the weight of the wire. Answer in units of N.
*October 4, 2014*

**Physics**

A particle moves according to the equation x(t) = (10 m/s2) t2 where x is in meters and t is in seconds. Find the average velocity for the time interval from t1 = 2.0 s to t2 = 3 s. Answer in units of m/s. Please help! I have no idea how to set this up :(
*September 7, 2014*

**phsycis**

consider the vector F1: (27N,20°)The angles are measured from the positive x axis with the counter-clockwise angular direction taken as positive. Consider the vector:F2=-F1 What is in degrees as measured from the positive x in the counter-clockwise angular direction the ...
*August 31, 2014*

**Math**

Shirley is on a Ferris wheel which spins at the rate of 3.6 revolutions per minute. The wheel has a radius of 35 feet, and the center of the wheel is 51 feet above the ground. After the wheel starts moving, Shirley takes 12 seconds to reach the top of the wheel. How high above...
*March 7, 2014*

**WORLD GEOGRAPHY**

In modern India, the "Garden City" of---- is know as India's "Silicon Valley"
*December 29, 2013*

**chem 1**

A gas-forming reaction produces 1.35 m3 of gas against a constant pressure of 143.0 kPa. Calculate the work done by the gas in joules.
*May 2, 2013*

**Chemistry**

N2 + 3H2 --> 2NH3 how many grams of ammonia is produced in the reaction?
*March 13, 2013*

**Chemistry**

2AgNO3 + BaCl2 --> 2AgCl + Ba(NO3)2 How many grams of sliver chloride are produced from 5.0g of sliver nitrate reacting with an excess of barium chloride?
*March 13, 2013*

**Chemistry**

2H2O --> 2H2 + O2 if 30 mL of hydrogen in the above reaction, how many milliliters of oxygen are produced?
*March 12, 2013*

**Chemistry**

2H2O --> 2H2 + O2 if 30 mL of hydrogen in the above reaction, how many milliliters of oxygen are produced?
*March 12, 2013*

**Chemistry**

2H2O --> 2H2 + O2 if 30 mL of hydrogen in the above reaction, how many milliliters of oxygen are produced?
*March 12, 2013*

**Math**

What volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia? N2 + 3H2 --> 2NH3
*March 12, 2013*

**Chemistry**

How would I convert 5% to M?
*December 4, 2012*

**Chemistry**

Given the following equation: 2CH3CO2H + Ca(OH)2 --> Ca(CH3CO2)2 +H2O If you start with 30 ml of a 5% solution of acetic acid, how much of a .1M Ca(OH)2 solution would it take to completely neutralize the acid? I'm not quite sure how to start? Should I convert 30 ml to ...
*December 4, 2012*

**chem**

the pressure 15 meters under water is 248 kPa what is the pressure in atm what is the pressure in mmHg
*November 13, 2012*

**S.S. Check answers**

thx yalll all those answers helped
*November 9, 2012*

**Statistics**

a. In a random sample of 500 observations , we found the proportion of successes to be 48%. Estimate with 95% confidence the population proportion of successes. B. Repeat part (a) with N=200 C. Repeat part (a) with N=1000 I need to know how to do this in excel?
*July 17, 2012*

**Statistics**

A normally distributed population has a mean of 40 and a standard deviation of 12. What does the central limit theorem say about the sampling distribution of the mean if samples of size 100 are drawn from this population.
*July 17, 2012*

**Statistics**

A reseacher would like to determine whether a change in lighting to full spectrum light bulbs increases productivity on an assembly line. A sample of n= 36 participants is obtained, and the light bulbs over the line are replaced. under general/historical operating procedures, ...
*July 12, 2012*

**Statistics**

The Centers for Disease Control and other organizations are interested in the health benefits of breastfeeding for infants. The National Immunization Survey includes questions about breast-feeding practices, including the questions about breast-feeding practices, including the...
*May 15, 2012*

**Calculus**

A pig farmer wants to enclose a rectangular area and then divide it into six pens with fencing parallel to one side of the rectangle (see the figure below). There are 610 feet of fencing available to complete the job. What is the largest possible total area of the six pens?
*April 26, 2012*

**physics**

hmmmmm. You have been given a tricky one I dont know good luck
*March 26, 2012*

**principles of physics**

A 19.3- gmass of gold in the form of a cube is 1.00 cmlong on each side (somewhat smaller than a sugar cube).What would be the length of the sides of a cube having four times this mass of gold?
*March 21, 2012*

**principles of physics**

Find the density of a 4.2- kg solid cylinder that is 13 cm tall with a radius of 5.0 cm.
*March 21, 2012*

**physics**

If the radius of the Earth somehow bloated to twice its size, with no changes in mass, your weight at the Earth's new surface would be ___A) one-quarter.B) one eighth.C) the same.D) twice.E) half.
*March 4, 2012*

**physics**

Which of these three produces a greater tidal effect on you right now—the moon, the Earth, or the sunA) The sun.B) The Earth.C) The moon.
*March 4, 2012*

**physics**

Why is your weight not one-quarter as much when you climb to the top of a twice as tall tree? A) Because, quite simply, of Newton's law of action and reaction.B) Because parts of the tree itself gravitationally attract you.C) But it is, in accord with the inverse-square ...
*March 4, 2012*

**physics**

Rank the average gravitational forces from greatest to least between:A. Sun and Mars.B. Sun and the Moon.C. Sun and Earth. i answer b,c,a and its wrong
*March 3, 2012*

**physics**

To tighten a bolt, you push with a force of 72 N at the end of a wrench handle that is 0.26 m from the axis of the bolt.What torque are you exerting? I GOT THIS PART AS 19N *m unsure of the next two: If you move your hand inward to be only 0.10 m from the bolt, find the force ...
*March 3, 2012*

**physics**

If a trapeze artist rotates once each second while sailing through the air and contracts to reduce her rotational inertia to one-third of what it was, how many rotations per second will result?
*March 3, 2012*

**physics**

If you move your hand inward to be only 0.10 m from the bolt, find the force that you should exert to achieve the same torque.
*March 3, 2012*

**physics**

To tighten a bolt, you push with a force of 72 N at the end of a wrench handle that is 0.26 m from the axis of the bolt.What torque are you exerting?
*March 3, 2012*

**Math**

find the domain: 1/(x^2+2x-3)=square root of x
*August 15, 2011*

**chemistry**

would the measure absorbance id an FENCS+ ion solution be higher, lower, or unaffected if there were fingerprints on the cuvette? briefly explain.
*March 20, 2011*

**algebra**

It depends how you look at it.
*February 9, 2011*

**humanity**

8. Newspapers, once available only in print, have evolved into 24-hour multimedia operations. In addition to newspapers, briefly describe the evolution of movies, television, Internet, books and magazines, and media companies throughout the last century.
*January 28, 2011*

**PHYSICS**

A 3kg mass is observed to accelerate 20m/s^2, 20 (degrees). Two forces act on the object. One force is 4.5N, 45 (degrees). Find the other force.
*November 30, 2010*

**PHYSICS**

If a fly collides with the windshield of a fast moving bus a) which experiences the greater impact force: the fly or the bus, or is the same force experienced by both? b)which experiences the greater acceleration: the fly or the bus or is the same acceleration experienced by ...
*November 30, 2010*

**Corporate Finance**

Figured it out: dividend yield x par value divided by interest rate .094*100/.083 = $113.25
*April 4, 2010*

**Corporate Finance**

Taylor Inc. has preferred perpetual stock outstanding that has a par value of $100 per share and a dividend yield of 9.4% of stated value. If the appropriate interest rate for Taylor’s preferred stock is 8.3%, how much is each share of preferred stock worth?
*April 4, 2010*

**Statistics**

never mind got it
*February 12, 2010*

**Statistics**

PLEASE HELP :)
*February 12, 2010*

**Statistics**

I am stuck on this probability question: Any suggestions of where to start would be great!! Thanks! Given 20 people, what is the probability that among the 12 months in the year there are 2 months containing exactly 4 birthdays each and there are 6 months containing exactly 2 ...
*February 12, 2010*

**electrochemistry**

I am soooo confused! I was given this PdCl4^2-(aq)+Cd(s)----Pd(s)+4Cl^-(aq)+Cd^2+ I am supposed to give the 1/2 reaction for The PdCl4^2- My teacher said you could figure out the charges on the atoms by, in PdCl4^2, taking the subscript and mult. by the superscript to get the ...
*November 17, 2009*

**electrochemistry**

If I have 2- 1/2 reactions that are- O2(g)+4H(aq)+4e- -------2H2O and CyFe3+(aq) +e---------CyFe2+(aq) How do I determine the # of electrons transfered? In addition, if the electrons are on different sides of the equations how would I then determine the # being transfered? ...
*November 15, 2009*

**chemistry**

how do I set up a problem for the solubility product(Ksp) of a salt given the osmotic pressure at 781atm?
*November 11, 2009*

**adult education**

at the end of an interview you are asked this question "how is this interview going" ,what is the appropriate response
*October 31, 2009*

**math 156**

how are concepts of the greatest common factors divisibility, and lowest common multiple used when computing fractors? provide an example and demonstrate how the concepts are used.
*June 23, 2009*

**Gen College Chemistry**

Thanks so much! Sorry about the equation, it was 3 H2.
*October 22, 2008*

**Gen College Chemistry**

2AL+6H-->2AL+3H. What volume of hydrogen gas at STP would be evolved in a reaction of 36.0mg of 98% pure aluminum with the hydrogen being an ideal? I got the ml of hydrogen, but I don't know how to work it with AL being 98%pure.
*October 22, 2008*

**Chemistry**

For some reason, this isn't working out for me. Can you further help me? I am very confused.
*June 28, 2008*

**Englsih**

how is the exit exam an opportunity though?...for you to go to the college you wanted?
*March 6, 2008*

**Englsih**

but in your opinion...do you think students should or should not take the exam because i am writing a persuasive essay and i need ideas...my con is that the ELD students are usually not ready for the exit exam that may cause problems for them...now i need some pro. thanx
*March 6, 2008*

**Englsih**

Can i have your opinion about taking the High School Exit Exam...do you want to take it or not and why?
*March 6, 2008*

**Macro economics**

Between year 1 and 3 the price level has risen and real GDP has fallen. During the same time W has risen. Identify one comination of changes in the labor supply and labor demand that could have the effect in the classical goods and services market.
*February 15, 2008*

**Essay (again)**

Assess America's contribution to the Allied victory in World War I. Do you think that the US's involvement was crucial to victory? Why or why not. I am not really looking for anyone's specific opinion, just websites that will give me the info i need to form my own ...
*February 7, 2008*

**English**

I think that it is an appropriate way to start a sentence, but a better usage of "you see" would be at the end of a sentence. I had a dream you see. It really depends on the setence and what you are trying to convey.
*February 6, 2008*

**Essay**

I'm not really looking for opinions. What i need is some good websites that will give me the info i need to form my own opinion.
*February 6, 2008*

**Essay**

Assess America's contribution to the Allied victory in World War I. Do you think that the US's involvement was crucial to victory? Why or why not.
*February 6, 2008*

**New Nationalism**

How did new nationalism respond to industrilization?
*January 31, 2008*

**Government**

Does anybody have any ideas as to where i can finde info about the Democrats and Republicans in the late 1800s, other that wikipedia?
*January 6, 2008*

**Gettysburg Address**

What does Lincoln say must happen to ensure that the soldiers that dies at Gettysburg did not die in vain?
*January 2, 2008*

**biology**

a cork
*January 2, 2008*

**Civil War**

What was the role of the Emancipation Proclamation in the formulation of Northern trategy and war goals?
*December 10, 2007*

**Trigonometry**

[sinxcosx/(1+cosx(]-[sinx/(1-cosx)]= -(cotxcosx+cscx)
*December 4, 2007*

**US History**

What delayed the annexation of Texas (other than the threat of war with Mexico)? I already checked out wikipedia. Thanks.
*November 28, 2007*

**EMERGENCY!!!**

a good website is webmd with a perid and then a com at the end
*November 19, 2007*

**Essay**

In what ways were cotton production and slavery more of a burden to the South than a benefit.
*November 12, 2007*

**APUSH**

APUSH means Advanced Placement United States History. The United States in the 1800s.
*November 12, 2007*

**history**

thankyou
*October 8, 2007*

**history**

i think it is Putin but I'm not all so sure
*October 8, 2007*

**history**

Who is the current leader of Russia? Is it Victor Zubkov or Vladmir Putin?
*October 8, 2007*

**Pre-Algebra**

the rule is subtract 15 (from every 5)
*October 8, 2007*

**Pre-Algebra**

the rule is subtract 15
*October 8, 2007*

**chemistry**

No precipitate formed when an aqueous solution of NaCl or Na2SO4 was added to the sample solution. A precipitate formed when the sample solution was made basic with NaOH. Which ion(s) are present in the sample soluiton? [Hg2]2+ [Ba]2+ [Mn]2+ I know that all three are not, but ...
*October 8, 2007*

**Math**

there is a number answer, which is y i am confused.
*September 28, 2007*

**Math**

How many sides are there in an argument?
*September 28, 2007*

**Physics...What am I doing wrong??**

In an experiment, a student measures the speed of sound in air to be 318 m/s at STP. If the accepted value for the speed of sound under those conditionsis 331 m/s, what is the student's percent error? a. 3.9% b. 3.93% c. 4.09% d. 4.1% I tried but it didn't work. This ...
*September 11, 2007*

**science**

That isn't a question
*September 11, 2007*

**physics**

In an experiment, a student measures the speed of sound in air to be 318 m/s at STP. If the accepted value for the speed of sound under those conditionsis 331 m/s, what is the student's percent error? a. 3.9% b. 3.93% c. 4.09% d. 4.1% I tried but it didn't work. This ...
*September 11, 2007*

**physics**

about how many nickels equal a kilogram? 4.A mass of one kg of nickels has a monetary value in the US $ of approximately: a. $1 b. 10 cents c. $10 d. $1000
*September 11, 2007*

**social studies**

aka Dred Scott vs. Sanford, In what is perhaps the most infamous case in its history, the court decided that all people of African ancestry -- slaves as well as those who were free -- could never become citizens of the United States and therefore could not sue in federal court...
*September 11, 2007*

**MATH**

3x^2+20x+12 x^2+20x+36 (3x+_a_)(3x+_b_) What times wat =20 is a and adds up to 36 is b Then divide a by 3 and b by 3 giving u: (x+__)(x+__) then make x = to 0 x+__=0 x+__=0 subtract over the number and you will have your answer
*September 11, 2007*

**calculus**

f*g= 2(3x+2)^2-(3x+2) G*f= 3(2x^2-x)+2 f*f= 2(2x^2-x)^2-x g*g= 3(3x+2)+2
*September 10, 2007*

**Math inequalitites**

Hi, I need some help with some inequalitites. Thanks!! Use graphs to find the set. 1.(-9,0) intersection [-4,] I got [-4,0) 2. (-9,0) U [-4,10] I got (-9,10] Solve the linear inequality. Other than (empty set, use interval notation to express the solution set and graph the ...
*August 18, 2007*

**Math**

Ariana took 2 h longer to drive 360 mi on the first day of a trip than she took to drive 270 mi on the second day. If her speed was the same on both days, what was the driving time each day? Start with time, t. If t is the time in hours the first day, then t-2 is the time for ...
*July 3, 2007*

**sociology**

Axia here too. Man let's all meet here again for futhur discussions on this class. This is hard for me and I am hope I can pass this class. Thanks for the help you guys!
*July 20, 2006*

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