Positive Definition and 987 Threads

Again , its another case of "dont understand the question" (how the hell am i ever going to get the answer :smile: ) Anway, on with the question (it seems simple...): "By completing the square, show that x^2+2x+5 is positive for all real values of x " I have completed the square, my...

Positive / negative angle help please I just started the trig unit and was learning about positive and negative angles The self exercise says find the corresponding positive angle of -75 degrees. would the answer be 75 degrees? I know that -75 means the angle was made from the terminal...

I am not a physicist nor a mathematician. I am not familiar with Einstein's actual equations so I don't know. This is simply a thought in the form of a question. Photons and electromagnetic waves travel at c. At the speed of light time goes to 0 (zero); also, time is negative in the equations...

How many positive integers less than 500 have exactly 15 positive integer factors? I know the answer, but not sure it. Can you give me the answer ?

Hey Everyone, This is a quick question.. is binding energy positive or negative? I'm pretty confused now, because in some places the definition was: The energy released when the nucleus of an atom is formed by combining neutrons and protons. And in other places: the energy required to...

In this question I let "x1t , x2t, x3t " be the conjugate of x1, x2, x3 The hermitian form Hc(x) = c*x1t*x1 + 2*x2t*x2 - i*x1t*x2 + i*x2t*x1 + x1t*x3 + x3t*x1 +i*x2t*x3 - i*x3t*x2 (sorry, it`s a bit messy) For which value of c is Hc ositive definite? I have tried to find the...

The terms of this series are reciprocals of positive integers whose only prime factors are 2s and 3s: 1+1/2+1/3+1/4+1/6+1/8+1/9+1/12+... Show that this series converges and find its sum. this is my first time writing here. i hope someone can help me with this question.

How many pairs of positive integer a, b are such that a^2 + b^2 = 121?

Find all positive integers c such that it is possible to write c = a/b + b/a with positive integers a and b. Please help me :smile:

There's an old problem concerning an old drunken person who is so sloshed he can't walk properly: he's got a 50/50 chance of stepping a metre forwards; otherwise he moves a metre backwards. It can be shown that he winds up where he started infinitely many times and that his average displacement...

Hello scientists, I'm unable to make any advances with this small problem.. two equal and positive charges (q) travel (in the same direction) at a speed (v), and are parallel to each other, at separation (r). Derive an expression for the force between them, in the form of: F = Felec(1 -...

Does every positive polynomial in two real variables attain its lower bound in the plane?

Should positive and negative charge be termed opposites? Maybe they are merely complimentary and this is why they seek each other and are not opposites?

For the function f(x) = 3sin bx + d where b and d are positive constants, determine an expression for the smallest positive value of x that produces the maximum value of f(x). :confused:

hi i am new to THIS place here but i do put posts on the number theory site as well. i am in need of direction and have no idea where to turn. i need help w/ two ?'s and they are... how many pos int. <1000 are NOT divisible by 12 or 15? prove the if the sum of two consec. int. is a...

Does self interest negate the positive effects of a country's actions? The USA is constantly claimed to be selfish, despite the result of 'selfish' acts being HIGHLY positive for others (The marshall plan is a great example). Currently, it could be argued that we would like to develop oil...

Despite studying chemistry I've never actually been given this information, any explanations/theories that could possibly explain why?

Just curios. Why do the electrical outlets in my home have a positive, negative, and a ground? With circuits that I am familiar with, if you have a positive and a negative connected, there is no need for a ground. Does anyone have an explanation? Pan

A friend of mine told me that (by his teacher) 0 is an even and positive number, how can it be?

Hi Folks Can anybody help me; I am looking for a small electrical circuit to control an output voltage in DC between Zero to 6 volts. The input for the circuit is from a 24-volt commercial vehicle, but my difficulty lies in the fact It comprises of two positive feed wires driving an...

What does it mean when it's said that the positive terminal of a battery is at a higher potential than the negative end? How does electric potential (voltage) relate to electric current/electric fields?

Opposite charge always attract and same charge repel each other. Will proton and electron crash on each other? What will happen if they do so?

Positive solving Zeno’s “Achilles” paradox? How do You find https://www.physicsforums.com/showthread.php?s=&postid=85446#post85446 [?]

I know very little about it, but am interested in installing it on my second computer. So what are positive aspects of using Linux? Why would I want to run it on my computer? Where can I get it to try it out? Is it easy to use? Is the software I use for Windows XP compatible or does it have...

Hello. Here is a circuit layout based on the ideas of Edwin Gray and Stefan Hartmann. We all know that when a difference of potential is set along a circuit, the charges goes from one terminal to the other, and finally deplete the source. Now, I explain briefly how the proposed circuit...

The arithmetic mean of a set of nine different positive integers is 123456789. Each number in the set contains a different number of digits with the greatest value being a nine-digit number. Find the value of each of the nine numbers .

if a^k =1 and a \in \mathbb{C} k \in Z^+ and for some k A = \{a|a^k = 1\} does |A| = k ? edited: becasue the real numbers are a subset of the complex numbers

I know that as things "fall" towards each other, they lose potential energy, that's fine. What I want to know is when a photon falls towards a mass does the photon also lose potential energy? I would assume so because potons have an equivalent mass. From the equation E = hf, can I therefore...

Let's say that I rig up a truck to a giant helium balloon, but I load up the back of the truck with enough stones so that the truck has reached a state of neutral buoyancy--its just floating in mid-air, not rising not falling, just there. Now let's say I take away a one-pound rock from the...

Over in the Skepticism and Debunking forum, good ole John has suffered several rounds of debunking. If we assume that we have correctly debunked Mr. Edwards, and not to say that all persons would agree that we have, I still have to wonder: Is he really doing more harm than good? If millions of...

I've been thinking... i've always been interested in sex, since i was really young, its almost unbelievable. i always thought it was just a fasination... but now, i think its more just a part of my nature. the other day i was hacking, and soon as topics turned to sex, i was like, awesome. I'm...

Hi I am in a spot of bother. Actually I live in an under developed country where science and technology is not upto the modern standards and there is very little practical facilities. I want to ask if I have a metal sheet of some thickness how it could be made permenantly positive and...

http://www.cnn.com/2003/TECH/space/07/28/sprj.colu.space.poll.ap/index.html

I'm trying to prove that my daughter is my daughter. We just did DNA testing, but either me or my daughter has a mutation in our DNA and the lab is having a hard time coming up with an answer. They said that they are 98.75% sure that I'mno the father, but they won't say I'm the father unless...

I've been doing this question, but can't seem to get past a particular bit. here's the question: 'Two positive point charges Q are held on the x-axis at x = a and at x = -a. A third positive point charge q, of mass m, is placed on the x-axis away from the origin at coordinate x such that |x|...

Why is it that black colors create a positive elctrical charge, while white colors send a negative charge? Does it have to do with different wave lengths? When light (in a copy machine) is focused on to the photoconductive drum, why and how does the black color become positively charged? I...

If matter is positive energy,and spacetime is charged with positive energy from the matters energy that collapsed into a black hole,gravity would attract energy from spacetime.matter could use this energy to produce electromagnetic field.this would also mean that gravity is not a force that acts...