Saturday

April 19, 2014

April 19, 2014

Total # Posts: 159

**Public Speaking**

I have to do an informative speech over a country that I've visited. I am stuck on getting some main points. So far, I have climate and attractions as my main points. I was also kind of thinking that I could talk about the kinds of food people eat in this country.

**Physics**

What are the effects of radation on humans?

**Physics-Rutherford**

Can you please give me a brief explanation of Rutherfords experiment?

**physics**

What are vector components?

**Physics**

What are the vector components? Would direction and speed be apart of it?

**Math essay**

Can some please check the grammer in my essay?

**Math essay**

The resouce I used was from Wikipedia

**Math essay**

Even though, Mathematics may not seem like it has a lot of history, it really does. The history of Mathematics has progressed so much, that even today there are more developments and discoveries still going on. Without the many things that have been found throughout history, M...

**Math essay**

Still today, Mathematics history is still in the making. In about mid-March of 2007, there was a team of researchers throughout North American and Europe who used network of computers to map E8. Even though its not know exactly how the understanding of E8 can be useful, the di...

**Math essay**

Not only did the 20th century have account for hundreds of new Ph.D’s and twenty unsolved problems, but over three thousand theorems were developed in the 1910’s by Srinivasa Aiyangar Ramanujan (1887-1920). Ramanujan theorems consisted of propties of highly composite...

**Math essay**

Afterward, in the 20th century the profession of Mathematics became even more significant. There were hundreds of new Ph.D’s in Mathematics that were honored every year. Also, jobs were accessible both in teaching and industry. David Hilbert presented twenty three unsolve...

**Math essay**

There was also a new form that was developed in the 19th century. This new form of algebra was called Boolean algebra, which was invented by a British mathematician George Boole. Boolean algebra was a system in which only consisted of the numbers zero and one. Today, this syst...

**Math essay**

The 19th century lead to Mathematics becoming abstract. One of the greatest mathematicians of all time lived during the 19th century. He was Carl Friedrich Gauss (1777-1855) and he gave the first acceptable proofs of the fundamental theorem of algebra and of the quadratic reci...

**Math essay**

Still there was one more question which was: what kind of number is the square root of two? Greeks had already known that it wasn’t a fraction and this question could have possibly played a part in the on going development of fractions. John Napier (1550-1617) came up wit...

**Math essay**

The 18th century brought even more historical events in Mathematics. The knowledge of the natural numbers are preserved in monolithic structures, it is the older than any surviving written text. One way to see the development of the assorted number systems of modern Mathematic...

**Math essay**

Europe in the 17th century would now be seeing an exceptional explosion of mathematical and scientific ideas. Galileo observed Jupiter’s moons in orbit using a telescope that was based on an imported toy from Holland. Then a Dane by the name of Tycho Brahe, collected a va...

**Math essay**

Europe’s Mathematics would now shift into early modern Mathematics in c. 1400-1600. While Europe was in its dawn of the Renaissance, still Mathematics was limited by awkward notation in which Roman numerals were used and relationships were expressed by using words instead...

**Math essay**

With these new sources, it sparked a renewal of Mathematics. Thomas Bradwardine proposed that speed (which is represented as V) gets bigger in arithmetic proportion as the ratio of force (which is represented as F) to the resistance (which is represented as R) increases in geo...

**Math essay**

In c. 500- 1400, the Medieval European mathematics progressed. The Medieval European’s interest in Mathematics was driven by concerns that were quite different from those of modern Mathematics. It was the belief that Mathematics provided the main insight of the created or...

**Math essay**

Around 1000 AD, in a book written by Al-Karaji appeared the first known proof by mathematical induction. The book was used to prove the binomial theorem, Pascal’s triangle, and the sum of integral cubes. Aside from Al-Karaji, there was Omar Khayyam, a 12th century poet wh...

**Math essay**

The history of Mathematics didn’t stop there. There were Arabic and Islamic Mathematics in c. 800-1500. It was the Islamic Arab Empire who were established across the Middle East, Central Asia, North Africa, Iberia, and parts of India in the eighth century all made notewo...

**Math essay**

Diverging from the Classical Chinese Mathematics, there is the Classical Indian Mathematics in c. 400-1600. In c. 400, the Surya Siddhanta introduced trigonometric functions of sine, cosine, and inverse sing, and put down the rules to determine the true motions of the luminari...

**Math essay**

Aside from books that involved Mathematics in China, the Chinese also made use of the complex combinatorial diagram recognized as the magic square. The magic square was expressed in ancient times and perfected by Yang Hui (1238-1398 AD). Also, Zu Chongzhi, of the Southern and ...

**Math essay**

It wasn’t until c. 500- AD 1300, which was the Classical Chinese Mathematics started. In 212 BC China, the Emperor Qin Shi Huang (Shi Huang-ti) demanded that books outside of Qin state be burned. This demand wasn’t obeyed. The book that survived was the oldest Mathem...

**Math essay**

Also, in the Greek and Hellenistic Mathematics, Aristotle was involved. He (384- c. 322) was the first to write down the laws of logic. Euclid (c. 300 BC) was the initial example of the format in which is still used in Mathematics to this day, definition, axiom, theorem, proof...

**Math essay**

Then the there was the Greek and Hellenistic Mathematics in c. 550 BC- AD 300. The Greek Mathematics supposedly started with Thales (c. 624- c. 546 BC) and Pythagoras (c.582- c. 507 BC). Thales and Pythagoras influences were often disputed, but there is a possibility that both...

**Math essay**

In c. 900 BC – AD 200, the ancient Indian Mathematics was also developing. It was the early Iron when Verdic Mathematics began with the Shatapatha Brahmana (c. 800-500 BC), which was the approximation of the value of pi to two decimal places. There was also the Sulba Sutr...

**Math essay**

Also, in c.1800-500 BC the Babylonians had their Mathematics written in sexagesimal (which is a base 60) numeral system. This is where the present day use of 60 seconds in a minute, 60 minutes in a hour, and 360 degrees in a circle comes from. In c. 900 BC – AD 200, the a...

**Math essay**

Now, the history of Mathematics was now progressing even more in the Ancient Near East (c.1800-500 BC), such as Mesopotamia and Egypt. In Mesopotamia (which today is Iraq), there was evidence of written Mathematics. The evidence dated back to the ancient Sumerians whom built t...

**Math essay**

It was before the earliest records, drawings were used to indicate the knowledge of Mathematics and measurement of time based on the stars. There were paleontologists that had discovered ochre rocks in a South African cave that was adorned with scratched geometric patterns tha...

**Math essay**

As of today, there are plenty of new developments in the area of Mathematics. In at least some Mathematics courses, it doesn’t cross the mind of a student about the history that Mathematics has. There is much more to Mathematics than theorems and rules. The history of Mat...

**Math essay**

Can you please proofread my essay? My teacher is grading on accuracy, quality, correct spelling and grammer. The History of Mathematics As of today, there are plenty of new developments in the area of Mathematics. In at least some Mathematics courses, it doesn’t cross the...

**Algebra-Parbola**

I need help with the following questions. Graph the parabola with the given equation. (y-2)^2=6(x-1) (x+1)^2=6(y-1)

**Ellipse-Algebra**

I need help with the following questions please. Graph the ellipse. ((x-1)^2)/(9)+ ((y-2)^2)/(4)=1 (4(x+1)^2)+9(y-2)^2=36

**Algebra**

The one in book, is 7x^2=35-5y^2

**Algebra**

I am not too sure about this problem. Can you please help me? Graph the ellipse and locate the foci. 9x^2=144-16y^2 I got (- squareroot 7, 0) and (squareroot 7,0), but I was looking at one problem in one book similar to it, and it had the answer as (0, - squareroot 7) and (0, ...

**Algebra-Partial Fractions**

Can you please help me with the following questions please, I dont understand them. I know the general rule about them. Write the partial fraction decomposition of the rational expression. (x^2+4x-1)/(x^2+3)^2 (4x^3+4x^2)/(x^2+5)^2

**Partial Decompostion Fractions**

Can you please help me with the following questions please, I dont understand them. I know the general rule about them. Write the partial fraction decomposition of the rational expression. (x^2+4x-1)/(x^2+3)^2 (4x^3+4x^2)/(x^2+5)^2

**Objective functon**

An objective function and a system of linear inequalities representing constraints are given. Graph the system of inequalities representing the constraints. Find the value of the objective function at each corner of the graphed region. Use these values to determine the maximum...

**Algebra**

Please check my answers: Solve the problem. A steel company produces two types of machine dies, part A and part B. The company makes a $3.00 profit on each part A that it produces and a $5.00 profit on each part B that it produces. Let x= the number of part A produced in a wee...

**Algebra**

Can you please check my answer: Solve the problem. A person with no more than $4000 to invest plans to place the money in two investments, telecommunications and pharmaceuticals. The telecommunications investment is to be no more than 3 times the pharmaceuticals investment. Wr...

**Physics**

I need help with question one and I need question three to be checked please? 1.How does the mass of a nucleon compare with the mass of an electron? 3.Why do protons in a very large nucleus have a greater chance of flying apart by electrical repulsion? -I think its because the...

**Math Essay**

I have to write this paper over the history of math, can you please give me some other websites that I can use? So far I have one website from wikipedia. Also, can you please read my introduction? As of today, there are plenty of new developments in the area of Mathematics. Ho...

**Electromagnetic induction-check answers**

Please check my answers: why does an iron core increase the magnetic iduction of a coil of wire? -I am thinking it has something to do with the voltage being increased. Will a cyclist coast farther if the lamp is connected to the generator on his bicycle is turned off? -I say ...

**physics-check my answer**

in what position can a current-carrying loop of wire be located in a magnetic field so that it doesn't tend to rotate? -I think it would be perpendicular

**Magnets-Physics**

I have a few questions that I am not too sure of. why is it inadvisable to make a horseshoe magnet from a flexible material? -is it because it would have enough magnetism Do the poles of a horseshoe magnet attact each other? If you bend the magnet so that the poles get closer ...

**physics**

please check my answers and help me with the first one. how can you charge an object negatively with only the help of a positively charged object? -This one I am not too sure, when one material is rubbed against another electrons jump readily from one to the other but protons ...

**Physics-Check my answers**

when combing you hair you scuff electrons from your hair onto the comb.is your hair then positively or negativley charged?How about the comb? -Your hair is postively charged, while the comb is negatively charged Why are the tires for trucks carrying gasoline and other flammabl...

**Physics-Check my answers**

At the atomic level, what is meant by saying something is electrically charged? - When something is electrically charged it means that it has a positive charge. Why is charged usually transferred by electrons rather that protons? -The electrons are oppositly charged than the p...

**Physics Problems**

Would it be 16 N?

**Physics Problems**

Can you please help me with the following problem? Two charges separated by one meter exert 1-N forces on each other. If the charges are pushed to 1/4 meter separation, the force on each charge will be?

**Physics**

Can you please help me with the following questions. Thanks! How does Rutherford's model of the atom acoount for the back-scattering of alpha particles directed at the gold leaf? What is Bohr's key idea (involving matter waves) that makes the Bohr atom have discrete en...

**Physics**

I have this formula z=1/x (which is the formula for conductance) My x values are: 98.3 ohms, 967 ohms, and 545 ohms. What would my "z" values be? I know the units would be siemens.

**Physics**

How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?

**physics help**

A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is? when i work this out with the formula that you gave me, i get 2525 instead of 2000 N

**physics asap**

A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is? On this question I asked my teacher I am suppose to get 2000 N and I dont get how to get it.

**physics problem-check**

do i have the following answer right? a tv set is pushed a distance of 2m with a force of 20 N that is in the same direction as the set moves. how much work is done on the set? would it be (2 m)(20 N)= 40 J

**physics word problem**

A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is? On this question I asked my teacher I am suppose to get 2000 N and I dont get how to get it.

**physics**

Will check my work and help me with the last two problems please? A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed? -(12 kg/m/s) / 4kg=3m/s A ball is moving at 4 m/s and has a momentum of 48 kg m/s. What is the ball's mass? -(48kg/m/s) / (4m/s) =12 kg ...

**algebra**

7(3x^3-4)

**algebra**

(21x^3 - 7)/(3x - 1)(this one I cant get the anwswer to match up with my answer choices.) Is there a way that I could use syntheic division?

**Algebra**

7.(21x^3 - 7)/(3x - 1)(this one I cant get the anwswer to match up with my answer choices.) Is there a way that I could use syntheic division?

**Physics**

How do I also do combinations circuits?

**Physics**

I am having some problems trying to figure this out. Series circuits I have a "d" battery, a battery holder, 3 different resistors, and a multimeter. How do I put the resistors into a series cicuit? And when I use the multimeter, does it need to be set on ohms or vol...

**Algebra Problems**

Please check my answers. Find the coordinates of the vertex for the parabola defined by the given quadratic function. 1.f(x) = (x - 4)2 - 4 -I got (4,-4) Find the axis of symmetry of the parabola defined by the given quadratic function. 3.f(x) = (x + 2)2 + 7 -I got: x=-2 Find ...

**Algebra**

Please check my answers. Find the coordinates of the vertex for the parabola defined by the given quadratic function. 1.f(x) = (x - 4)2 - 4 -I got (4,-4) Find the axis of symmetry of the parabola defined by the given quadratic function. 3.f(x) = (x + 2)2 + 7 -I got: x=-2 Find ...

**Algebra**

Please check my answers. Find the coordinates of the vertex for the parabola defined by the given quadratic function. 1.f(x) = (x - 4)2 - 4 -I got (4,-4) Find the axis of symmetry of the parabola defined by the given quadratic function. 3.f(x) = (x + 2)2 + 7 -I got: x=-2 Find ...

**Physics**

Will you check my work and help me with the last two problems please? A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed? -(12 kg/m/s) / 4kg=3m/s A ball is moving at 4 m/s and has a momentum of 48 kg m/s. What is the ball's mass? -(48kg/m/s) / (4m/s) =12...

**Physics Questions**

Can you please help me with some and check my answers? Thanxs! 3.Which is stronger, the electrical force between an electron and a proton or the gravitational force between these particles? -I got that the electrical force between an electron and a proton. 6.Two charges separa...

**Algebra**

Please check my answers. Find the coordinates of the vertex for the parabola defined by the given quadratic function. 1.f(x) = (x - 4)2 - 4 -I got (4,-4) Find the axis of symmetry of the parabola defined by the given quadratic function. 3.f(x) = (x + 2)2 + 7 -I got: x=-2 Find ...

**Algebra**

Can you please help me with the following problems? Find the coordinates of the vertex for the parabola defined by the given quadratic function. 1.f(x) = (x - 4)2 - 4 Find the axis of symmetry of the parabola defined by the given quadratic function. 3.f(x) = (x + 2)2 + 7 Find ...

**Physics Problems**

Will check my work and help me with the last two problems please? A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed? -(12 kg/m/s) / 4kg=3m/s A ball is moving at 4 m/s and has a momentum of 48 kg m/s. What is the ball's mass? -(48kg/m/s) / (4m/s) =12 kg ...

**Variation**

Please check my work, the answer I am suppose to get is 17.5, but instead I got 2.5. Solve the problem. 66. y varies jointly as a and b inversely as the square root of c, y=24 when a=6,b=4, and c=49. Find y when a=2, b=5, and c=16. -I got: y=kab/ sqrt of c, y=2*5/ sqrt of 16, ...

**Algebra**

Could you please check my answers? Find an nth degree polynomial function with real coefficients satisfying the given conditions. 1. n=3; 3 and i are zeros; f(2)=20 -I got: f(x)=-4^3+12x^2-4x+12 3.n=3;4 and i zeros;f(-3)=60 -I got:f(x)=6x^3+24x^2+6x+24

**Check my answers. Algebra**

Can you please check my answers? Thanxs! Write an equation that expresses the relationship. Use k as the constant of variation. 20. f varies jointly as b and the square of c. -I got: f=kbc^2 22. r varies jointly as the square of s and the square of t. -I got: r=ks^2t^2 Find th...

**Variation**

Could you please help me with the following question? Find the variation equation for the variation statement. 31. z varies jointly as y and the cube of x; z=96 when x=2 and y=6 (I dont understand this one. My answer choices are: a.y=2x^3y,b.y=2xy^3, c.y=-2x^3y, or d. y=-2xy^3)

**Polynomial Functions**

Could you please check my answers? Find an nth degree polynomial function with real coefficients satisfying the given conditions. 1. n=3; 3 and i are zeros; f(2)=20 -I got: f(x)=-4^3+12x^2-4x+12 3.n=3;4 and i zeros;f(-3)=60 -I got:f(x)=6x^3+24x^2+6x+24

**Polynomial Function**

Could you please check my answers? Find an nth degree polynomial function with real coefficients satisfying the given conditions. 1. n=3; 3 and i are zeros; f(2)=20 -I got: f(x)=-4^3+12x^2-4x+12 3.n=3;4 and i zeros;f(-3)=60 -I got:f(x)=6x^3+24x^2+6x+24

**Need help with variation**

Could you please help me with the following question? Find the variation equation for the variation statement. 31. z varies jointly as y and the cube of x; z=96 when x=2 and y=6 (I dont understand this one. My answer choices are: a.y=2x^3y,b.y=2xy^3, c.y=-2x^3y, or d. y=-2xy^3)

**Variation Problem**

Could you please help me with the following question? Find the variation equation for the variation statement. 31. z varies jointly as y and the cube of x; z=96 when x=2 and y=6 (I dont understand this one. My answer choices are: a.y=2x^3y,b.y=2xy^3, c.y=-2x^3y, or d. y=-2xy^3)

**Variation Problem**

Could you please help me with the following question? Find the variation equation for the variation statement. 31. z varies jointly as y and the cube of x; z=96 when x=2 and y=6 (I dont understand this one. My answer choices are: a.y=2x^3y,b.y=2xy^3, c.y=-2x^3y, or d. y=-2xy^3)

**variation**

Can you please check my answers? Thanxs! Write an equation that expresses the relationship. Use k as the constant of variation. 20. f varies jointly as b and the square of c. -I got: f=kbc^2 22. r varies jointly as the square of s and the square of t. -I got: r=ks^2t^2 Find th...

**variation**

Can you please check my answers? Thanxs! Write an equation that expresses the relationship. Use k as the constant of variation. 20. f varies jointly as b and the square of c. -I got: f=kbc^2 22. r varies jointly as the square of s and the square of t. -I got: r=ks^2t^2 Find th...

**Variation-Check Problems**

Can you please check my answers? Thanxs! Write an equation that expresses the relationship. Use k as the constant of variation. 20. f varies jointly as b and the square of c. -I got: f=kbc^2 22. r varies jointly as the square of s and the square of t. -I got: r=ks^2t^2 Find th...

**Variation-Questions**

I have some questions that I dont understand and need to be checked please? Slove the problem. 1. y varies directly as z and y=187 when z=17. Find y when z=15 -This is how I did it: 187=k*17, I divided by 17 on both sides and got k=11, then I plugged it back into the equation ...

**Variation**

I have few questions that I need checked please and could you help me with the last question? Write an equation that expreses the relationship. Use k as the constant of varaiation. 1. s varies directly as h -I got: s=kh 2.a varies directly as the square of m. -I got: a=km^2 De...

**Physics**

What does it mean to say that angular momentum is conserved? Give an example you might see on Earth. How could conservation of angular momentum help astronomers understand the development of the solar system? (this the part of the question that I dont understand)

**Phyics**

I have a few questions that I need help with please. Show by algebraic reasoning that your gravitational acceleration toward an object of mass M a distance d away is a = GM/d2 and therefore doesn’t depend on your mass. (I dont understand this question) What does it mean t...

**Physics**

what is the use of knowing the center mass of an object when making a calculation?

**Physics**

I am doing this exercise for physics class where I have to place a penny on a ruler and balance it. And I dont understand what is the use of knowing the center mass of an object when making a calculation?

**Algebra**

I need help solving the following. Perform the indicated operatioons and write them in standard form. (-4 - squareroot of -36)^2

**Physics Problem**

Could you please check my work? 2. A 2 kg ball of putty moving to the right at 3m/s has a head-on inelastic collision with a 1 kg ball of putty moving to the left at 3m/s. What is the final magnitude and direction of the velocity of the stuck together balls after the collision...

**Algebra- ASAP**

Could you please help me and check my answers? Find the domain of the function. f(x)=-8x-2 -I got the domain being (negative infinity, postive infinity). g(x)= 3x/(x^2 -49) (I got (-inifinity,-7)U (-7,7) U (7, +ininfinity) The U is the union symbol. Find the domain of the comp...

**Physics**

Could you please check my answers and help me with some? 1. What does it mean to say a physical quantity is conserved? Why is this idea useful? (I dont understand how it is useful) -When a physical quantity is conserved it means that it doesn’t change. 2. A 2 kg ball of p...

**Functions**

Could you please help me and check my answers? Find the domain of the function. f(x)=-8x-2 -I got the domain being (negative infinity, postive infinity). g(x)= 3x/x^2 -49 (I got (-inifinity,-7)U (-7,7) U (7, +ininfinity) The U is the union symbol. Find the domain of the compos...

**One to one functions- Re-Check**

y=(x+4)/5x, doesnt match up with what I am suppose to get. I am suppose to get: a. f^-1(x)=4/(5y) +1/5, b. f^-1(x)=4/(5x) +1/(5), c. f^-1(x)= -1/(5) -4/(5x), or d. f^-1(x)=5x-1/(4)

**Function compostions**

Sorry I had to repost, I left somethings out. Can you please check my answers? For the given functions f and g, find the indicated composition. 5. f(x)=7x+9, g(x)=2x-1 Find (f *g)(x) I got 14x+2 For the given functions f and g, find the indicated composition. 8. f(x)=-5x+3, g(...

**Domain of composite function**

Can you please help me with the following questions? Find the domain of the composite function f * g. 12. f(x)=x+3, g(x)=1/(x+7) 15. f(x)=7x+70, g(x)=x+2

**Functon compostions**

Can you please check my answers? For the given functions f and g, find the indicated composition. 5. f(x)=7x+9, g(x)=2x-1 I got 14x+2 For the given functions f and g, find the indicated composition. 8. f(x)=-5x+3, g(x)=6x+3 I got -30x+18 Find functions f and g so that h(x)= (f...

**Algebra**

Find the domain of the function g(x)= 3x/x^2 -49 I try to figure it out it, and since x^2-7 is a perfect square (x+7)(x-7), I thought x couldnt be +-7?