Tuesday

September 23, 2014

September 23, 2014

Total # Posts: 70,953

**Chemistry**

An electron has an uncertainty in its position of 611pm. What is the uncertainty in its velocity?
*September 15, 2014*

**Organich Lab Help Please!!!!!!!!**

The second part of the question I found that aqueous phase is still the bottom layer based on the density of each. I just want to make sure I'm on the right track. Thanks!
*September 15, 2014*

**Organich Lab Help Please!!!!!!!!**

You use 100 ml ethylchloride (density 0.92 g/ml) to extract 25 ml ethylene bromohydrin (density 2.41 g/ml) mixed with 100 ml of water. Is the aqueous layer the lower or the upper layer. How could you easily test this. You dissolve sodium chloride 40g. in the above mixture. ...
*September 15, 2014*

**Biology**

Are a replication fork and an origin of replication the same thing?
*September 15, 2014*

**7th grade math**

You should do 1/2 * 3/4, not the other way around.
*September 15, 2014*

**history**

4. The Puritans viewed themselves as creating A. an ideal Christian community to be copied by others B. a prestigious university for training ministers C. an English colony identical to the lifestyle in England D. a haven for persecuted religious minorities I think its A? The ...
*September 15, 2014*

**Math**

But if I plot f(x) = -3x + 5 and -f(x) = 3x - 5, it does not give me the reflection.
*September 15, 2014*

**Math**

If I want to reflect f(x) = -3x + 5 over the x-axis, would the new equation be f(x) = 3x - 5? Or is it -f(-x) = 3x - 5?
*September 15, 2014*

**history**

The established church in the Southern colonies was? the Anglican Church right? The most important cash crop in colonial Virginia was? tobacco right? Roger Williams believed wholeheartedly in A. extermination of all Native Americans B. complete separation of church and state C...
*September 15, 2014*

**history**

what was the puritan ultimate source of authority? it was the bible right?
*September 15, 2014*

**college algebra**

An executive invests $29,000, some at 8% and some at 4% annual interest. If he receives an annual return of $1,680, how much is invested at each rate?
*September 15, 2014*

**general knowledge**

How to write 9 september 2014 in 5 letters without using numbers..?
*September 15, 2014*

**Settlement**

One goal the French and Spanish colonists had in common in the New World was Answer developing the fur trade. establishing stable governments. converting the Native Americans. searching for gold and other precious metals.
*September 15, 2014*

**Organich Lab Help Please!!!!!!!!**

a) You use 100 ml ethylchloride (density 0.92 g/ml) to extract 25 ml ethylene bromohydrin (density 2.41 g/ml) mixed with 100 ml. Is the aqueous layer the lower or the upper layer. How could you easily test this. ----- Ethylchloride is less dense so it is the top layer Ethylene...
*September 15, 2014*

**statistics**

AAA reports that the average age of a car on U.S. roads in recent years has risen to 7.5 years. Suppose that the distribution of the age of automobiles assumes a mound shaped distribution. If 99.7% of the ages are between 1 year and 14 years, what is the value of the standard ...
*September 14, 2014*

**Math**

How do you write the transformation of a quadratic function two units right from its parent function? Is it y = (x + 2)^2?
*September 14, 2014*

**Math**

A Social Security number has seven digits. How many Social Security numbers are possible?
*September 14, 2014*

**Math**

An exam consists of six true-or-false questions. Assuming that every question is answered, in how many different ways can a student complete the exam? In how many ways may the exam be completed if a penalty is imposed for each incorrect answer, so that a student may leave some...
*September 14, 2014*

**Quick math help**

An angle with a measure of 89.9 degrees... Would it be a right or an acute angle?
*September 14, 2014*

**physics**

While riding in a hot air balloon, which is steadily descending at a speed of 1.39 m/s, you accidentally drop your cell phone. (a) After 4.00 s, what is the speed of the cell phone? (b) How far is the cell phone below the balloon after this time? d = m (c) What are your ...
*September 14, 2014*

**Physics Help**

A crane is used to lift air conditioning units to the top of a 5-story building. Each story is 3.5 m high. The crane accelerates the units while lifting the units past the first story and then lifts them at a constant velocity past the second through fourth stories. it hen ...
*September 14, 2014*

**Chemistry Urgent Help and Check Please!**

a) You use 100 ml ethylchloride (density 0.92 g/ml) to extract 25 ml ethylene bromohydrin (density 2.41 g/ml) mixed with 100 ml. Is the aqueous layer the lower or the upper layer. How could you easily test this. ----- Ethylchloride is less dense so it is the top layer Ethylene...
*September 14, 2014*

**Physics Help Urgent **

On a dare, you decide to try bungee jumping. You fall freely you are moving at 15 m/s downward. At that point the cord begins to stretch. The cord slows you to a stop as it stretches, then pulls you back upwards. When the cord is no longer pulling on you, you are moving ...
*September 14, 2014*

**physics**

At a point P, the electric field is 78 N/C at 51° counter-clockwise from the positive x axis. A particle of mass 4.7 kg and charge -0.11 C is located at P. Find the direction of the force on the particle: ___ degrees counter-clockwise from the positive x axis the direction...
*September 14, 2014*

**chemistry **

2 HI(g)--><--H2(g) + I2(g) When a sufficiently large sample of HI(g) is introduced into an evacuated vessel at 643 K, the equilibrium concentration of I2(g) is found to be 0.248 M. Calculate the concentration of HI in the equilibrium mixture. M. Please help! I have no ...
*September 14, 2014*

**physics**

It has been suggested, and not facetiously, that life might have originated on Mars and been carried to Earth when a meteor hit Mars and blasted pieces of rock (perhaps containing primitive life) free of the surface. Astronomers know that many Martian rocks have come to Earth ...
*September 14, 2014*

**statistics**

You have just completed a round trip to New York and back by car. The one way distance traveled is 210 miles. If your average speed traveling to New York was 70 miles per hour and your average speed returning to Baltimore was 50 miles per hour (heavy traffic) what was your ...
*September 14, 2014*

**Geometry**

If you live in Australia ,then you have been surfing. Is it a true conditional statement?
*September 14, 2014*

**statistics**

You have just completed a round trip to New York and back by car. The one way distance traveled is 210 miles. If your average speed traveling to New York was 70 miles per hour and your average speed returning to Baltimore was 50 miles per hour (heavy traffic) what was your ...
*September 14, 2014*

**Physics Help**

On a dare, you decide to try bungee jumping. You fall freely you are moving at 15 m/s downward. At that point the cord begins to stretch. The cord slows you to a stop as it stretches, then pulls you back upwards. When the cord is no longer pulling on you, you are moving ...
*September 14, 2014*

**English help**

I need help coming up with a personal response to the story "The Stealing Thors Hammer." I don't know how to put it. It must have as comment, interpretation, evaluation etc.
*September 14, 2014*

**Physics**

A 47.0-g Super Ball traveling at 29.5 m/s bounces off a brick wall and rebounds at 15.5 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 5.00 ms, what is the magnitude of the average acceleration of the ball during this time interval?
*September 14, 2014*

**Organic Chem Help **

You use 100 ml ethylchloride (density 0.92 g/ml) to extract 25 ml ethylene bromohydrin (density 2.41 g/ml) mixed with 100 ml. Is the aqueous layer the lower or the upper layer. How could you easily test this. ----- Ethylchloride is less dense so it is the top layer Ethylene ...
*September 14, 2014*

**math**

(12^5)^3 = 12 ( I have to find the exponent) my answer is 15 for the exponent
*September 14, 2014*

**Math**

Use distributive property and simplify the expression. 4 + 2(3x - 1) + 9 - 6x + 15 - 5x + 14 - 3x + 14 - 6x + 11 *my answer* I wanna make sure my answer is right. 3.82e+7 (there is no multiple choice) my answer is 38200000
*September 14, 2014*

**Chemistry Urgent Help Please!**

If caffeine is soluble in hot benzene but insoluble in hot petroleum ether, how could you use this information to design a crystallization procedure?
*September 14, 2014*

**Math!**

1) What is the value of 19 + 5a^4 + 3b^2 when a = 2 and b = -4? (this is not a multiple choice question) but my answer is 147. 2)Combine the like terms to simplify the expression: 4 + 7xy^2 + 5y^3 + 10x -4xy^2 - 8x - 4y^3 + 9 - y^6 + 3x^2y^2 + 10x + 13 - y^3 + 3xy^2 + 2x + 13...
*September 14, 2014*

**physics**

Two cars A & B are coming closer to one another with speed 36 km/h and 72 km/h Separated by a distance 1500 m calculate : 1 . time interval after which two car meet . 2 . if acceleration of car A is 2m/s2 then calculate time interval after which car A & B Will meet. 3.if ...
*September 14, 2014*

**physics**

A train is moving parallel and adjacent to a highway with a constant speed of 24 m/s. Initially a car is 48 m behind the train, traveling in the same direction as the train at 35 m/s and accelerating at 3 m/s 2 . What is the speed of the car just as it passes the train?
*September 14, 2014*

**Chemistry Urgent Help Please!**

You use 100 ml ethylchloride (density 0.92 g/ml) to extract 25 ml ethylene bromohydrin (density 2.41 g/ml) mixed with 100 ml. Is the aqueous layer the lower or the upper layer. How could you easily test this. You dissolve sodium chloride 40g. in the above mixture. Assuming the...
*September 14, 2014*

**Physics**

!@#$%^& THIS
*September 14, 2014*

**Chemistry**

2.91*10^6?
*September 13, 2014*

**Chemistry**

What is the velocity of an electron that has a de Broglie wavelength approximately the length of a chemical bond? Assume this length to be 2.5×10−10m .
*September 13, 2014*

**Math**

What is the parent function of h(x) = -x^2? Is it h(x) = x^2 or h(x) = -x^2? How can I describe h(x) = -x^3 as a transformation of the parent function of a cubic function? Do I just say that it is a reflection, or is there a way of saying it with numbers, as in h(x) = x^3 - 4?
*September 13, 2014*

**math**

2.Calculate the growth rate of Asset J dividends, we have to assume that future dividend payments will grow at a constant rate into the future forever. This constant rate can be estimated by calculating the average growth rate from the past dividends. Calculate Asset J’s ...
*September 13, 2014*

**HISTORY**

9-10. Since almost all Native American tribes were ,_______________ much of our information on their culture comes from the writings and stories of ___________________________. A. non-literate B. stupid C. Christians D. Muslims E. traders and missionaries F. All of the above I...
*September 13, 2014*

**chemestry**

How many molecules (not moles) of NH3\rm NH_3 are produced from 8.21×10−4gg of H2\rm H_2
*September 13, 2014*

**HISTORY**

15-20. Put the following events in chronological order, with A for the first to occur and G for the last to occur. g The “Pilgrims” land at Plymouth Rock, Massachusetts F Defeat of the Spanish Armada D Jacques Cartier leads the first French effort to colonize the New...
*September 13, 2014*

**HISTORY**

True False Columbus first sighted land in the New World near Newfoundland. I would say false because wasn't John Cabot the one to discover Newfoundland? Columbus was a devout adherent of A. Sunni Islam B. Hinayana Buddhism C. Orthodox Judaism D. Roman Catholicism E. ...
*September 13, 2014*

**HISTORY**

European overseas commercial expansion was aided by A.advances in shipbuilding and navigation B.the centralized power of nation-states C.European desires for wealth through trade D.the desire for alternative trade routes to bypass the Ottomans E.All of the above F. None of the...
*September 13, 2014*

**Science**

what is spectral broadening
*September 13, 2014*

**statistics**

A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 13 hours, with a standard deviation of 2.5 hours. It is desired to estimate the mean viewing time within two-quarter ...
*September 13, 2014*

**math**

when you throw up a cricket ball foot ball tennis ball and a basket ball which will go to a maximum height
*September 13, 2014*

**engineering science**

An object is kept in equilibrium on an incline by means of supporting force, which is at an angle of 30 degrees o the inclined. The weight of the obbject is 500N. The incline forms an angle of 45 degrees with the horizontal. The coefficent of the friction between the surfaces ...
*September 13, 2014*

**maths**

Ted recieved his pocket money He spent: 3/5 on games 1/10 on magazines What fraction of his pocket money is left? I dont understand how to do this question. Please help
*September 13, 2014*

**maths**

Thank you so much. I understand your method. Thank you again:)
*September 13, 2014*

**maths**

Debra recieved her £15 pocket money. She spent: 1/3 on magazines 2/5 on a necklace How much did she have left? My answer 1/3 of 15 is 5 2/5 of 5 is 2 2 pound is left Am I correct?
*September 13, 2014*

**History**

Discuss the causes of French Revolution of 1789
*September 13, 2014*

**HISTORY**

The most likely place of origin for Native Americans is A. Atlantis B. Asia C. Israel D. Polynesia E. Mars F. All of the above I would say central Asia, correct?
*September 13, 2014*

**HISTORY**

True or False Native American cultures generally had no concept of private property. I'm not sure whether to say true or false but I want to say false because Native Americans were aware of private property, they just weren't obsessive and greedy with it like the ...
*September 13, 2014*

**HISTORY**

15-20. Put the following events in chronological order, with A for the first to occur and G for the last to occur. g The “Pilgrims” land at Plymouth Rock, Massachusetts F Defeat of the Spanish Armada D Jacques Cartier leads the first French effort to colonize the New...
*September 13, 2014*

**physics**

A girl delivering newspapers covers her route by traveling 2.50 blocks west, 3.50 blocks north, and then 5.50 blocks east.
*September 12, 2014*

**In Response to Previous Math Question**

What parent function describes the set (-1, -1), (0, 0), (1, -1) (-2, -8), (2, -8)? So should I write f(x) = x^2 or f(x) = -x^2 for the parent function?
*September 12, 2014*

**Pre-Calculus/Trigonmetry**

Thank you, Damon
*September 12, 2014*

**Pre-Calculus/Trigonmetry**

Write the equation of the line that is parallel to the x-axis and goes through the point (1,4).
*September 12, 2014*

**Math**

What parent function describes the set (-1, -1), (0, 0), (1, -1) (-2, -8), (2, -8)?
*September 12, 2014*

**English**

Can you put this sentence into completely every word in present tense and still make this sentence make sense. Humans are never satisfied
*September 12, 2014*

**Math**

If I am traveling at a speed of 65 mi/h and graph the distance I travel over five hours, would the graph be linear?
*September 12, 2014*

**Biology**

A hydrogen ion is the same as a proton true or fasle
*September 12, 2014*

**Biology**

Breaking the hydrogen bond between two water molecules is called dissociation. true or false
*September 12, 2014*

**Pre-Calculus/Trigonometry**

Help please Tracy has a cell phone plan that provides 250 free minutes each month for a flat rate of $29. For any minutes over 250, Tracy is charged $0.35 per minute. Which of the following piecewise functions represents charges based on Tracy's cell phone plan? A. f(x)={...
*September 12, 2014*

**physics**

You are enjoying a day at the amusement park, riding a roller coaster, when suddenly a section of track up ahead crashes to the ground. You estimate that the cart is travelling at 5 m/s horizontally on the track before you begin to fall through the air. If the coaster leaves ...
*September 12, 2014*

**Canadian history**

Thank you very much Ms. Sue :)
*September 12, 2014*

**chemistry**

when 21.6g of carbon were burned in the presence of 73.9g of oxygen 16.3g of oxygen remain unreacted. What mass of carbon dioxide was produced
*September 12, 2014*

**programming**

write a program that performs a survey tally on vehicle. The program should prompt for the next person until a sentinel value of -1 is entered to terminate the program. Each person participating in the survey should choose their favorite from the following list-toyota,nissan,...
*September 12, 2014*

**programming**

write a program that performs a survey tally on vehicle. The program should prompt for the next person until a sentinel value of -1 is entered to terminate the program. Each person participating in the survey should choose their favorite from the following list-toyota,nissan,...
*September 12, 2014*

**Science (college level)**

dentify the fruit or vegetable you selected and relate the second law of thermodynamics to the changes in energy observed in Appendix CHow did the amount of energy gained compare to the amount of energy lost as heat at the second through fourth trophic levels? Considering the ...
*September 12, 2014*

**Math Problem (please help)**

IF x = 3 How much is 2(6x) + 2 (W)
*September 12, 2014*

**math**

fill in the following table, assets required for operation $2000 Case A - firm uses onlyequity financing Case B - firm uses 30% debt with a 10%interest rate and 70% equity Case C - firm uses 50% debt with a 12% interst rate and 50% equity
*September 12, 2014*

**physic**

what would the reading on the scale if the boxcar were moving at a constant velcity
*September 12, 2014*

**Finance**

Assets required for operation: $2,000 Case A – firm uses only equity financing Case B – uses 30% debt with a 10% interest rate and 70% equity Case C – firm uses 50% debt with a 12% interest rate and 50% equity
*September 12, 2014*

**physic**

A 22.2 kg mass attached to a spring scale rests on a smooth, horizontal surface. The spring scale, attached to the front end of a boxcar, reads T 44.1 N when the car is in motion. If the sring scale reads zero when the car is at rest, determine te acceleration of te car, when ...
*September 12, 2014*

**Math Problem (please help)**

If X= 3 How the is the perimeter of the rectangle 2(6X) + 2(W)=?
*September 12, 2014*

**Math (2nd time posting this)!**

So the first one would be 10^-6 and the second one would be 10^6 ?
*September 11, 2014*

**Math (2nd time posting this)!**

the best order-of-magnitude estimate for 0.00006? - 10^-3 - 10^-4 - 10^-5 * my answer - 10^-6 the best order-of-magnitude estimate for 789,000? - 10^7 - 10^6 - 10^5 - 10^4 *my answer I don't understand this quite well but I want to make sure my answers are correct. Thanks!
*September 11, 2014*

**Physics**

A military jet is flying with uniform motion at 9.3*10^2 m/s[S], the magnitude of which is approximately Mach 2.7. At time zero, it passes a mountain top, which is used as the reference point for this question. a)Construct a table showing the plane's position relative to ...
*September 11, 2014*

**Math**

the best order-of-magnitude estimate for 0.00006? - 10^-3 - 10^-4 - 10^-5 * my answer - 10^-6 the best order-of-magnitude estimate for 789,000? - 10^7 - 10^6 - 10^5 - 10^4 *my answer I don't understand this quite well but I want to make sure my answers are correct. Thanks!
*September 11, 2014*

**English**

1) is real-life one word? My teacher considered it to be. 2) then would Spanish-Americans be one word?
*September 11, 2014*

**Poll**

Have you ever been a hero? If so, what did you do
*September 11, 2014*

**?**

What challenge have you faced lately? ask at least 5 people
*September 11, 2014*

**Physics**

A car traveling 91km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.93m . What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of "g's," where 1....
*September 11, 2014*

**college math**

v=1/3ttr^2h; h(geometry)
*September 11, 2014*

**college math**

How many liters of water should be evaporated from 110 liters of a 12% saline solution so that the solution that remains is a 20% saline solution
*September 11, 2014*

**college math**

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island?
*September 11, 2014*

**physics**

How far is the rocket from the launch pad 8.50s later when the rocket engine runs out of fuel?
*September 11, 2014*

**Ecology**

8.Which of the following examples of an ecological study involves the ecosystem level of organization? A.The effects of human activities on biogeochemical cycling B.The effects of an invasive plant species on bird nesting sites C.The effects of competition on survival D.The ...
*September 11, 2014*

**MATH**

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island?
*September 11, 2014*

**science**

Which of the following is a good study habbit.
*September 11, 2014*

**Physics**

At bat a baseball player hits a ball at a height of .889 m. The ball leaves the bat at 51 m/s at an angle of 81 degrees from the vertical. The ball skims the top of a 2.74 m wall as it leaves the field. a.) Draw position, velocity and acceleration graphs describing the ball ...
*September 11, 2014*

**math**

The length of a rectangle is 3 feet less than twice the width of the rectangle. If the perimeter of the rectangle is 144 feet, find the width and the length
*September 11, 2014*

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