Factors Definition and 428 Threads

1. Is the charge density (No. of charges/volume) constant for a specific material ? e.g. Copper has a constant charge density no matter how big it is ? 2. Why someone told me that increasing the cross-sectional area of a wire will not affect its drift velocity ? The resistance will be reduced...

I was studying what kind of chemicals are used in various processes like thermite welding , rocket propellant. On what basis are these chemicals used? In welding Al + Fe2O3 is used. Why not Sodium and some weaker oxide as sodium is an alkali metal and highly reactive In rocket propeller H2O2...

Homework Statement Disregarding friction, if a car was rolling down a hill, what would the speed of the car at the bottom of the hill, be dependent on? Either the height of hill, length of hill, rotational inertia or the acceleration due to gravity.Homework Equations Without friction wouldn't...

24. A square coil is perpendicular to a uniform magnetic field. Which one of the following would increase the magnetic flux through the coil? A. Decreasing the area of the coil. B. Increasing the number of loops in the coil. C. Removing the coil from the magnetic field. D. Increasing the...

A question has arisen (not homework) showing two pulley systems and a box being pulled up with a man pulling each. The question asks who has to pull hardest. On one of them (A) the shafts (supporting the rope) are smaller whilst on the other (B) they are larger. The correct answer is that the...

ive read articles and it says that the tacoma suspension bridge failed because of its length and it being too thin so when the wind blew on it it fell. an question i have to answer from school is investigate bridge failures and explain why they failed using physics principles so exactly how...

So I just learned about these integrating factors and their utility in solving first order linear differential equations today. My mind is just kind of blown how it ends up simplifying the integration so much. Thats really pretty much the main thing I wanted to say... lol. But also, how the...

I understand that PhDs tend to take several years to complete due to a variety of reasons. It depends on your field and the type of research as well as personal factors I am probably not aware of. I was wondering how people complete their degrees in as little as three years. I'm not going to...

Hi I've been meaning to find a correction method for the true location of the sun so when I add the correction to the true sun it would give me the apparent sun. To clarify, I want to be able to calculate the difference of time between sunsets or sunrises if: There were no geographical...

Hi, I am writing up a project based on an algorithm for factoring large numbers, I have reached seemingly simple point where I am stuck, I wonder if anyone can help me? I am trying to factor a large N such that N=pq for unknown primes p and q, I have described a method to find a value for...

So I've been trying to figure out how to find the surface area Jacobians in spherical coordinates (I know how to use it to find the volume Jacobian). Using the divergence theorem I was able to find these Jacobians top-down, however, I am unsure to how one would derive them in the first place. I...

--> Why are prime numbers so important to number theory? (Apart from speculations of being connected to energy levels of complex quantum systems.) --> Let for time being, primes that we know of, be called primes of "type-2". Here '2' comes from the definition of primes. Since we consider...

My classmate has already asked about this I think, but since I can't find the post I'll ask again.. Take a single atom with degenerate energy levels E1, E2 etc. We place the atom in a resevoir and want to find the probability of probability for finding the atom in the different energy states...

how do transcription factors UNBIND from the DNA to prevent further transcription??

I've looked everywhere and can't seem to find any information. Would someone be kind enough to point me to some literature?

Hi everyone i am having some trouble with an electronics question I really need some help with. I keep getting 14.96 KV but that doesn't appear to be the correct answer. Is the answer given wrong or am i doing something wrong. Thanks for any help i have been stuck on this for ages...

I was wondering if this is a correct statement, I'm assuming it is for my proof. Let e,f and g be non zero integers and assume ef|g is true. I'm 100% positive this means e and f must both be a factor of g . May some one please confirm if I am correct or wrong please.

Hi. I am currently doing an experiment regarding to the factors affecting beet root cell membrane. Some of them are pH (2,4,6,8,10) , Ethanol (1%, 25%, 50%) and Detergent(1%, 5%). I've seen that different pH, different concentration in ethanol and detergent each has different results in both...

Homework Statement I have been dealing with Exact Equations in my DE class, and I came around this problem. (t^2-y^2)+(t^2-2ty)(dy/dt)=0 This is obviously not an exact eqn. So I tried using integrated factors on it and try to find this "factor" μ. But no matter if I did it in terms of...

Integrating Factors for ODEs (Question from Boas) Find an integrating factor by inspection to make the below differential equation exact. (y^2-xy)dx+(x^2+xy)dy=0 I've been inspecting, but I'm not seeing it! Is there a way to analyze this in my head that will lead me more easily to the...

Homework Statement The figure below shows a portion of a GC chromatogram for a mixture of two aromatic compounds labelled A and B. The separation employed a 2.20 meter packed column under isothermal conditions (90 C) and a flow rate of 12 mL/min. The figure shows the chromatogram in the...

One cubic mile of sea water, with a density of 1.13 g/cm3 contains how many gallons and how many tons of sea water? 1 cm3/.001 L 3.785 L/1 gal 1 kg/2.2046 lb 5280 ft3=1 mi3 1.13g/1cm3 X 2.2046 lb/1000 X 1 cm3/.001 L X 3.785/gal After this point I get a bit confused...

find the irreducible quadratic factors of z^(4)+4 The Attempt at a Solution Im stumped...this is all I've got: [(z^(2))^2]-[(2i)^2] (z^(2)-2i)(z^2+2i) Any guidance is greatly appreciated!

I'm trying to write a program that will find and then display the prime factor of a number. I have written this in C# but it works for some numbers but doesn't work for others? using System; class primefactors { public static void Main() { int number; bool...

As far as I understand plutonium production is mainly a function of the spesific burn-up. A low burn-up of under 1000 MWd/tU is preferred to produce weapongs-grade plutonium. The higher the burn-up the more pu-240 and other plutonium isotopes that makes production of weapons a bit more difficult...

3.5, 5.4, 8.2, 8.9, 13.6, 14.7, 17.1 22.9, 28.3, 31.8. is there any easier way then by hand :\ thanks for any help

Hi everone, I am trying to make a rough estimate of fatigue life of a hollow shaft under pure bending at a particular load level.The hollow shaft has a shoulder fillet. The minuimum outer diameter is 69mm and the maximum outer diameter is 72mm with a transition radius of 6mm.The thickness of the...

Homework Statement Hi, I submitted this question on here the other day a user suggested some topics which might help so I have went away and tried this and this is what I have came up with. I just want to know what I have so far is right also I need help with integrating the rhs of the...

Homework Statement find the general solution using integrating factors. xy' - 2y = 3x Homework Equations The Attempt at a Solution x(dy/dx) = 3x + 2y x*dy = (3x + 2y)dx (-3x + 2y)dx + xdy = 0 My = -3x + 2 Nx = 1 Not Exact (hence the use of integrating factors) μ(x)(-3x + 2y)dx + μ(x)xdy =...

1. For this question, I need to explain why sound waves emitted into ocean water sometimes fail to give accurate results. 2.I have thought about, the salt density and the waves traveling through different water temperatures, but need to expand on these two ideas and don't understand it enough to...

I seem to be at a loss to understand something pertaining to the role of the phase factors in defining quantum states and their consequences in quantum computing. So, I learned in class and read in numerous books, and online, that the phase factor has no physical significance as it does not...

How does one find the friction factor of a high pressure, turbulent steam flow? Is there a Moody Diagram equivalent for these fluid conditions?

Homework Statement The mechanical advantage of a lever is 0.08; force is not amplified, it is simply diminished; distance, however, is increased: Work input = Work output F x d = F x d F x d = 0.8F x ?(d) This must be a really basic question, but I'm compelled to ask as I'm somewhat...

If u(x,y) and v(x,y) are two integrating factors of a diff eqn M(x,y)dx + N(x,y)dy, u/v is not a constant, then u(x,y) = cv(x,y) is a solution to the differential eqn, for every constant c.

Homework Statement Make an approximate calculation of the x-ray atomic form factor for He by assuming that its electron density is given by a hydrogenic ground state. Homework Equations Need help with this. The Attempt at a Solution I attempted to use the hydrogenic model, but could not...

Hi. I'm having some trouble factoring complex polynomials. I'm sure it's very easy assignments, but I'm missing some key-information as to how to solve these tasks. Tasks: The task is to find the complex and real factors of the polynomials(since I'm not that articulate in english I will...

Homework Statement Q: A beam has a solid square cross section of 100 mm and is simply supported by two supports 3 m apart. Calculate the dead load that can be safely supported when applied to the middle of the beam. * The question doesn't state material but I'm informed that it is mild steel...

If the increase in an entity's inertia as it aproaches the speed of light causes a distortion in it's mass, then does the gravity of the entity become distorted as well? And if so, by what degree?

Here is the process: For example, take 28. Its prime factors (taken with multiplicity) are 2, 2, and 7. The sum of these is 11. Double it and you get 22. So, the sum of prime factors of 28 multiplied by 2 is 22. Repeat this process until you reach a loop or a stable number. For 28, if you...

does the identity of molecules affect the internal energy, besides the temperature and volume?

Hello users of Physics Forums,I come here seeking some guidance with a program i am writing in java.The point of my program is to determine the speed of the user depending on the following factors: Cadence,windspeed,bike weight and user weight. While i got a good mark in my physics class, (90)...

Hi, I have some equations I have derived though energy balances and have been using the Integration Factors method to solve equations in the form: dy/dx + Py = Q However, my original equations only work if I assume some variables to be constants. Removing this assumption leaves me with...

Homework Statement Expansion of the universe is described by the scale factor R(t), where t is the time after the Big Bang. For a flat universe the scale factor is today R(t)=C_{1}\cdot t^{\frac{2}{3}} When the Universe was radiation dominated, for t <200,000 years, the scale factor was...

Me and my Dad were having a conversation about the elongation of EMR wavelengths over an extended period of time. He began to explain to me what Red Shift was but I couldn't understand what he was trying to get at (he's a poor explainer, or I'm bad listener). But his explanation did spark an...

Hi, I have a problem with splitting x4 + 1 into real quadratic factors. How can this be done? Cheers.

Homework Statement I have an equation with all known variables and I have the answer...I just can't figure out how they converted the variables and came about the answer. The first equation is N/V = [2*pi*(2.315)/h^3][2*m*kT]^3/2 we have the known variables h (plank's constant)=...

I recently got interested in number theory and have been fiddling around with Scilab trying to find interesting things. I came across the following mildly interesting property, which I couldn't find much about on Google. Form the difference d_n between the sum of the squares of the prime...

I have an action of the form \int \alpha \sqrt{g} R where \alpha is a field. I want to do some kind of coordinate transformation, so that this term in the action becomes \int \sqrt{g}R + \sqrt{g}(...) where (...) consists of terms containing \alpha. So basically, I want to remove \alpha...

What factors effect the tipping of a car as it rounds a bend. Mass, Centre of mass, Velocity, and radius of curve, width of wheels. Am i missing anything?

I don't know how to construct formal proofs but there is the obvious geometric approach for 2 and 3 factors. However, how do you prove the commutative property holds up for 4+ factors? You end up with a lot of different orders in which you can multiply the factors and you can't just construct a...