Relationship Definition and 999 Threads

Why is the number of charge carriers per unit volume is inversely proportional to resistance?If there is more charges carrier, it doesn't increase the collision between free electron which causes in increase of resistance?sorry for my unclear concept of Electricity circuit.I hope there will be...

can temperature be changed without changing pressure as well as number of molecules for an ideal gas?

Homework Statement The table gives a firm’s monthly profits for their first few months of business. The numbers are rounded to the nearest £100. Number of months after start up (x) 1 2 3 4 5 6 Profit for this month (£y) 500 800 1200 1900 3000 4800 The firm’s profits, £y, for the...

Homework Statement Can someone help me balance the units in these equations? They are statistical best fits for product size - energy relationships. Homework Equations 1. P80 = Cl + W*Sl With units substituted into equation: micron = micron + kWh/t * Sl 2. P80 = Cp * W^Sp With units...

Homework Statement Homework Equations Sum of roots taken one at a time is -b/a Sum of roots taken two at a time is c/a three at a time is -d/a four at a time is e/a The Attempt at a Solution I did part one by solving the two equations...

I'm doing a solar cell characterization project. But due to some fault in my solar simulator(I'm getting different results from another set up), I'm now figuring a way to check the intensity of light shone by my simulator on cell. I'm trying to obtain it from the corrected data of my cell (Isc...

If our eyes can perceive light and light is energy then why is energy defined as an indirectly observed quantity?

Let's say I have a wave with 3 nodes and 2 antinodes if I doubled the frequency applied to the wave how many nodes and antinodes would my new wave have?

A huge common misconception about brain function is that function can be localized to "very" specific locations. However, reductionism falls apart when speaking about emergent phenomenon such as higher order brain functions (e.g. feeling of knowing, consciousness, visio-spatial processing). Just...

What is the the relationship between the specific heat capacity and power (e/t) required to raise the objects temperature? Of course the energy required increases, but does the time it takes change also?

Homework Statement What is the condition for the radiation term in the expression for the field B to predominate? Express you answer as a relationship between distance r and wavelength \lambda. B(r)=\frac{\mu_{0}I_{0}\delta l}{4\pi}sinθ...

I live in the DC metro area and we recently had snow that lasted all day (none stuck to the roads, booo). But I didnt understand that it was still snowing at well above freezing. I have a digital thermometer outside of my window and it read ~41 degrees F at its highest and never dropped below 32...

First consider the following definitions from Baby Rudin: Interval: A set of real numbers of the form [a,b] where for all x \in [a,b] we have a \le x \le b. K-Cell: A set of k-dimensional vectors of the form x = (x_1, ...,x_k) where for each x_j we have a_j \le x_j \le b_j for each j from...

Greetings! I'm new coming to this page but I have a question whose answer goes beyond my understanding of physics...really,even the question goes beyond my understanding but I feel comfortable enough to ask the question, just forgive me if I use the wrong wording... I've read and heard about...

εHi, Based on that hoary schematic cube representation in 3D for stress-strain relationship. Stress tensor {σxx, σyy, σzz, σxy, σyz, σzx} and strain tensors {εxx, εyy, εzz, εxy, εyz, εzx} can be written interchangably. Let's suppose that σzz=σzx=σzy=0 then the reamining terms are written...

Okay, so I have a sound wave (a visual representation). From this I can see the amplitude of the wave, However, I need to know what the sound power or the sound pressure level. Could someone please give me a formula that could help? Thanks

A sound is measured to have a decibel level of 30dB. If the intensity is decreased by a factor of 2 by how much does the intensity level change? β=10 x log(I/Io) β=Intensity level I=intensity of the object Io= Threshold of hearing(human) If the I increase so the β increase If so the...

This is similar to the "What do 'nerdy' guys like in girls?" thread but I am making this bit generic. I have come up with the following list of things which one might look for. Culture Ethnicity Income Interests Profession Sense of Humor His/Her Opinions Food Interests Health Age...

hi, i have seen on another topic here that the refractive index equals the square root of the dielectric constant. from datasheet values we have... water refractive index = 1.333 dielectric constant = 80.1 Without even doing the calculation its obvious that the square root of 80.1 is not...

So I'm trying to understand how the Higgs field and Higgs boson are different from the EM field and the photon. Firstly how I understand the photon is that It is the quanta of energy that an electromagnetic field oscillating at a certain frequency can give to some other system. The photon is the...

Hi, I am a postgraduate environmental science student (NOT a mathematician!) struggling through some necessary maths. Any help with the following (which I suspect will be relatively straight foward) would be very much appreciated. Please ask questions if I have not made myself clear. Homework...

I've become rather curious, as of late, about the realm of complex logarthims; more specifially logarithms in the form log(z) where z is any negative number. Excuse any ignorance on my part, as I'm only in Precalculus, but I was just curious to see how Euler's formula is related to complex...

Homework Statement So, let's say a car is rolling down a ramp. I have to maximize its acceleration, but I am confused about some things. I think that if I increase the car's mass, then it will have more momentum and roll down the ramp faster. But according to Newton's First Law of Motion, an...

Hello everyone, Sorry if this is in the wrong sub-forum, I wasn't sure exactly where to place it. I was wondering if there is an orthogonality relationship for the Legendre polynomials P^{0}_{n}(x) that have been converted to cylindrical coordinates from spherical coordinates, similar to...

Homework Statement Consider a 4 x 4 matrix A = B C 0 D where B, C, and D are 2 x 2 matrices. What is the relationship between the eigenvalues of A, B, C, and D? The Attempt at a Solution I suppose you can write A as: b1 b2 c1 c2 b3 b4 c3 c4 0 0 d1 d2 0 0 d3...

Homework Statement The motion of a particle is expressed by a=42-12x2 where a is in m/s2 and X is in m, with the initial condition: v=0 when x=0 and t=0 Determine v when X=6 Determine X when v becomes 0 again Homework Equations I tried using a=dv/dt so i took the anti derivative of a...

Homework Statement I am in the process of studying integration and finding the areas under curves. So far, I know of two methods of finding the area under a curve: the limit method and the direct integral method. Could someone explain the relationship between these two methods? Homework...

"Barrel of Fun" Carnival Ride, and the relationship between Friction and ω Homework Statement A ”Barrel of Fun” consists of a large vertical cylinder that spins about its axis fast enough so that any person inside will be held against the wall. Assume: At an angular speed ω1, an upward...

Hi, I'm taking a thermodynamics class and I'm stuck on how work relates to enthalpy and internal energy. Does work done by a system equal change in internal energy, change in enthalpy or does it depend on the situation? The question I'm stuck on asks for the work produced by a steam turbine...

is there a gas which its volume increases nonlinearly with decrease in pressure?

Homework Statement Given the magnetic field B= α*x*y x^ + β*y^2 y^. What is the relationship between α and β. Find the current density J. Homework Equations I know that the relevant equations are Δ dot B = 0, Δ x B = μJ, Δ dot A = 0, Δ x A = B The Attempt at a Solution I know...

If we're working in R^n and we consider the elements of a basis for R^n to be the column vectors of an nxn invertible matrix B, then what is the relationship between B and the matrix whose row vectors represent elements of the corresponding dual basis for R^n*? My guess, which Wikipedia helped...

Im trying to expand the range of my wifi network, and I am not sure exactly what to expect from a +27 dbi antenna. As I understand it, this will cause the power density to increase by a factor of 2^9. Does that mean the range will increase by a factor of 2^9? or would it be more like...

Homework Statement Hi there, I wanted to use TLD badges for my experiment using cf-252 instead of chips because they were the ones available. I was informed by the Laboratory section that the TLD had a max absorbed dose of 10 Gray. The neutron source cf-252 has an activity of 50...

Homework Statement So I have this lab I have to do about finding the relationship between static friction and normal force. So basically I need to find find how the Static Friction and Normal Force relate by doing a lab experiment. The materials I have are: Spring balance / scale Weights...

Homework Statement I want to find a relationship between the number of moles of O2 used and the number of CH2 units in an alkane in a complete combustion reaction. Homework Equations The Attempt at a Solution Right now I have come up with a math equation, given X units of CH2...

I'm having a hard time grasping the logical flow from orbital angular momentum to spherical harmonics. It feels like it's just sort of been sprung out of nowhere from both my lecture notes and the textbook. Can anyone help fill in the gaps that clearly must link them somehow? How did I get from...

Please have a look at the attached image. The two blue plates (rigid) are bolted to a red plate. Now an object with 10000 J of Kinetic energy hits the red plate and the red plate is deformed by 4 mm in the direction of energy. Due to this collision, the bolts encounter a shear stress. Can...

Homework Statement The relationship between arctanh and log is: arctanh(x)=\frac{1}{2}log(\frac{1+x}{1-x}) but if i take x=1.5, I have: arctanh(1.5)=0.8047 + 1.5708i and \frac{1}{2}log(\frac{1+1.5}{1-1.5})=0.8047 + 1.5708i as expected, but using the laws of logarithm, why does this...

hi experts as far I know the stokes theorem relates surface integral to line integral - but i am confuse how surface integral if represent area gets equal to length as represented by line integral.

Hi All, So I'm at the point where my brain is numb. I've been struggling for the past few hours trying to understand causality. Specifically, I have an input-output relationship y(t) = x(|t|). Determining if this is causal has been very difficult. Causal means that the output at any given...

I understand the inverse square relationship between sound intensity (I) and distance (r). There was a misunderstanding in physics class today about the mathematical and theoretical relationship between sound intensity and power according to the equation: I = P/4∏r2 Sound intensity is...

In my physics class we did a lab where we attached one end of a string to a .5 kg cart and the other end to a force meter which was all on a ramp. As we increased the angle of the ramp, the tension increased proportionally until the angle reached 45 degrees. From 45 degrees to 90 degrees, as we...

Relationship between Electric Fields and Distance from point charge?? Homework Statement Homework Equations E= kq/r^2 The Attempt at a Solution K so looking at the graph, I noticed that there is a inverse-square relationship between the electric field and the radius/distance...

What is the relationship (a mathematical one) between the density and the refractive index of a medium?

I emailed a prof about sitting in on his graduate-level gravitational theory class next semester. He said he would like his students to have understanding of electromagnetism, special relativity and quantum mechanics at the advanced undergraduate level. This is the course description...

I am curious to know using scientific information what color lightsaber is the strongest? I have done some minor research and cannot figure it out on my own. I have come up with that violet produces the highest frequency while red produces the lowest frequency. Using Planck's Law E=hv I gather...

I know that when viewing a graph in which velocity is on the y-axis and time is on the axis, the acceleration is the slope of the line. When viewing a graph in which a force is on the y-axis and a time is on the x-axis, (particularly one in which the graphed line makes a triangle) the area is...

Math name for "asymetric-pair" relationship? Say I have a function (F) that takes an input (P) and returns an output (E). Suppose F isn't invertible so, knowing F and E, one could not reconstruct P. Suppose also that there is another function (R) that can take E as input and returns P...

Homework Statement I have this assignment from my chemistry teacher and it asks to relate electroplating with the kinetic theory? I don't really understand how the kinetic theory has anything to do with redox, or other chemistry applications. Homework Equations The Attempt at a...