Difference Definition and 1000 Threads

This is my first time using this site so please excuse me if I missed any guidelines. 1. Homework Statement A plastic rod having a uniformly distributed charge Q=-25.6pC has been bent into a circular arc of radius R=3.71cm and central angle ∅=120°. With V=0 at infinity, what is the electric...

Homework Statement In an experiment modeling point charges I had to find equipotential lines. I did so using a voltmeter. The results looked like this: Not a good quality picture, but the equipotential line on the right says 1.3 mV and the one on the left says 2.3mV. From this I had to...

Homework Statement Plate capacitor is filled with two dielectrics of constants 3 and 4, and with a metal as seen in the picture. If the el. field in the first dielectric is 30 kV/cm, do: a) diagram of el. potential difference with calculated characteristic values using point C as a...

Homework Statement I am trying to solve a problem that asks me to give the total days between two dates. I have to take care of the some matters between those two dates such as leap years and the way of inputting the years by the users. (For example, if you input 1 and 17, the code will still...

I was reading up a bit about adsorption but am stuck at this part. http://www.chem.qmul.ac.uk/surfaces/scc/scat2_4.htm The part I'm confused about is the second last sentence.

This is not a homework.i am not able to understand rotating motional emf .so could u please tell why could we use the effective length to calculate emf in this case .

Hi, I am a student from the Netherlands in 6V, the year before university, and I'm doing research on Quantum Computing. However, I have difficulty understanding the four states of two entangled qubits, $$\left|00\right> \\ \left|01\right> + \left|10\right> \\ \left|01\right> - \left|10\right>...

There is this bike manufactured in India with a 180CC single cylinder petrol engine with Twin Spark plugs. They highly market their "twin spark technology". Well according to my knowledge, I don't think that will make much difference in performance and efficiency. What do you think? Is this just...

Homework Statement The two oscillators each have the same mass. Use Fig. 4.1 to determine (i) the phase difference between the two oscillators (picture attached) Homework Equations Subtracting to find the horizontal shift The Attempt at a Solution I found the two points where both graphs...

Is anyone aware of the differences between the 6th and 10th edition of Fundamentals of Physics by Halliday, Resnick, and Walker? I'm only talking about the first 20 or so chapters because I'm only interested in learning mechanics right now. Thanks!

Homework Statement Two particles are thrown horizontally from different heights with equal initial speeds. Find the difference of heights h1-h2 if the object fall to the ground at the same time. Homework Equations h=voyt+gt^2/2 The Attempt at a Solution As voy=vox=0, t1=t2, the difference of...

When reading about radioactive decay, I see two types of decay constants: λ and "k". From what I have interpreted, k = ln (.5) / half-life whereas λ = ln (2) / half-life. Have I defined these correctly? If this is so, the difference between the two is slight. When putting these into equations...

Hi. In a normal power plug, neutral is on the same potential as the Earth and therefore, in theory, safe to touch. Line carries the full voltage difference and is dangerous if the body provides a conducting connection to the earth, since this closes the circuit to neutral. Isolation...

Homework Statement Calculate the equivalent capacity of the capacitor system between points ##x## and ##y## Homework Equations ##C=q/V## The Attempt at a Solution I'm asking about this problem because I know how to calculate ##V_x-V_y##, but I don't know how can I extract the equivalent...

Do pH and pKa refer to the same concept? The same question for pOH and pKb also. What does kWh actually mean. In have read that it is the ionic product and is the product of [H+] and [OH-] but what does it indicate. Does it have any full form?

If i have two sinusoidal ac signals of 220V with the different phase angle i.e. there is some phase difference between them. Then can i make the phase difference zero?? Please tell

Homework Statement Develop aprogram that will determine the second derivative of pi(16 x^2 - y^4) at y=2 with step sizes of 0.1, 0.01, 0.001…. until the absolute error (numerical-analytical) converges to 0.00001. Use the 2nd order Central Difference Formula. User Input: y, tolerance Output: h...

Suppose I want to solve the time-independent Schrödinger equation (ħ2/2m ∂2/∂x2 + V)ψ = Eψ using a numerical approach. I then discretize the equation on a lattice of N points such that x=(x1,x2,...,xN) etc. Finally I approximate the second order derivative with the well known central difference...

Is rate of collision and frequency of collision the same ? In what ways are they different ?

I am going through a literature where the terms like ( 'plastic yielding' , 'plastic yield strength', plastic strength' and 'plastic stress') are regularly used and I am confused. Are they different and if yes then how each term differs from the other? I also want to know relation of plastic...

Hello, I came to know that a normal component of the viscous stress can exist at a solid surface for unsteady, compressible flows(though even in that case, the normal component of the viscous stress is typically much smaller than the tangential component). I tried googling it myself but could...

The problem statement Example 1 A single particle I have a particle being forced by a radial centripetal force onto a smaller radius $$l_1=m_c.v_1.r_1$$ $$L_1=L_2$$ $$L_2=m_c.v_2.r_2$$ $$m_c.v_1.r_1=m_c.v_2.r_2$$ $$v_1.r_1=v_2.r_2$$ $$v_2=v_1\frac{r_2}{r_1}$$ Its increase from ##v_1## to...

Let's say that there is an expression $x^2+y^2=14$ Cannot this expression be written as $(x+y)^2 = 14$ taking out the square which is common to both the terms $x$ and $y$ but after writing like that doesn't this become $x^2+2xy+y^2$=14 So writing the expression like that would it remain...

I was just wondering in writing the range of values for which the function is increasing or decreasing in in a positive or a negative way , The difference caused by the use of the symbols $'>'$ and $'≥'$ or in $'<'$ or $'≤ '$ For example If we consider the graph of the function...

I am solving the simple 2nd-order wave equation: $$ \frac {\partial ^2 E}{\partial t^2} = c^2 \frac {\partial ^2 E}{\partial z^2} $$ Over a domain of (in SI units): ## z = [0,L=10]##m, ##t = [0,t_{max} = 10]##s and boundary/initial conditions: $$ E(z=0) = E(z=L) = 0 $$ $$ E(t=0) =...

When solving the differential equations for an electromagnetic wave you get out that the electric and magnetic field oscillate in phase. But when considering a oscillating dipole, the electric and magnetic field at a point close to the dipole are a quater period out of phase. Can someone please...

Homework Statement A power supply used in a laboratory has an EMF of 5000 V. When, however, a voltmeter of resistance 20 kΩ is connected to the terminal of the power supply a reading of only 40 V is obtained. (a) Explain this observation. (b) Calculate (i) the current flowing in the meter and...

I have read that Young's Modulus, like spring constant, is a measure of stiffness (how hard it is to deform a material). Though apparently, Young's Modulus is a way of doing so that applies only to the material and not its shape, where a spring constant value depends on the dimensions of the...

I don't understand what is meant by a force being conservative. Is it where the force moves in an easier to calculate manner with straight lines; whereas, non-conservative moves in a curves where you'd have to use integration?

In physics, wave mechanics and vibration specifically, do the terms note, tone and mode mean the same thing or do they refer to difference things? Also what does the mode of oscillation exactly mean?

Homework Statement What potential difference is needed to give a helium nucleus (Q = 3.2 × 10-19 C) 50 keV of kinetic energy? Homework Equations V=U/Q 3.2 × 10-19 C = 2e The Attempt at a Solution I was quite sure I had the right answer but it keeps saying I'm wrong? V = (50*10^3 eV) / 2e =...

Hello everyone, The velocity and average velocity it is the same? The formula of the velocity is: distance / time or [L] / [T]. The average velocity is it equal? thanks

Suppose I am given some 1D Hamiltonian: H = ħ2/2m d2/dx2 + V(x) (1) Which I want to solve on the interval [0,L]. I think most of you are familiar with the standard approach of discretizing the interval [0,L] in N pieces and using the finite difference formulas for V and the...

In chemistry, chemical bonding is a very important topic. What I can't really understand is the interrelation of different theories which explains the same kind of thing, like for structure of any compound there are theories like Valence bond theory or VSEPR or molecular orbital theory. I am...

Hi guys, I set HDMI Modulator recently, but here is one question - it has QAM 16/32/64/128/256. What is the practical difference between 128 and 256 for example if I keep resolution and bitrate the same?

Electromagnetism is divided into two parts Electrostatics Magnetism Therefore I want to know what are the main difference between electrostatics and magnetism with their examples in layman terms because I am not at all introduced to this concept but I want to know the general concepts related...

Homework Statement An α-particle accelerated between a pair of parallel plates in a vacuum tube acquires a kinetic energy of 103 eV. What is the potential difference between the plates? Answer: 500 V 2. The attempt at a solution Well, it's 1000 / 2 = 500 V because there are two plates. But I...

Is precision the smallest division in measurement instruments? Is uncertainty one-tenth or a half of the smallest division in measurement instruments? I'm confused some say one-tenth, some say a half... Thanks in advance

Hai guys.. Today I've some discussion with math teacher. He wrote a question for his student about displacement. (Somehow A boat go to west 3 km, then move to north 4km. How is distance between A to the end?) In my opinion, that question better stated as "How is displacement". But in math...

Let's say there are two 1/2 spin particles, one in state 1/√2 |up> + 1/√2 |down> and the other in the state - 1/√2 |up> - 1/√2 |down> Both particles then have an equal chance of being measured to be in either the up or down states. Is there any physical difference between these or are they...

Homework Statement Is there a physical difference between the following wave functions? If yes, why? If no, why not? \Psi(x,0) =5e^{-ax^2} \Psi(x,0) =\frac{1+i}{\sqrt{3}}e^{-ax^2} \Psi(x,0) =e^{i\pi/7}e^{-ax^2} Homework Equations - The Attempt at a Solution They only differ in the...

Homework Statement When drugs are used to treat a medical condition, doctors often recommend starting with a higher dose on the first day than on subsequent days. In this problem, we consider a simple model to understand why. Assume that the human body is a tank of blood and that drugs...

Is there any difference between the meaning of the equation W=-ΔU and the meaning of the statement that potential energy of system is always negative when the reference point(zero point) is taken to be located at infinity or do they both convey the same message?

As I try and read cosmology literature with the eyes of layman , I find two different terms that seem to represent the curvature ( or lack of) of the universe . These are omega sub zero and omega k. But I can't see the difference between the two. Can anyone explain this?

Homework Statement The textbook on nuclear physics I am going through says: "The atomic weight M of a nuclide of mass number A can be found in the mass difference, ##\Delta##, given in column 3. The quantity ##\Delta = M-A## gives the difference between the nuclides atomic weight and its...

What's the difference between f(x)=3 and f(x)=3x^0 ? and why Limit of the second function when x\rightarrow0 exists ? and is the second function continuous at x=0 ?

I am taking a linear algebra course and an introductory physics course simultaneously, so I am curious about the connections between the two when it comes to vectors. In beginning linear algebra, you typically study vectors in ## \Re^{2}## and ## \Re^{3}##. Are these the same vector spaces used...

For one my homework questions I was asked to find the specific heat capacitance of a certain material. The specific heat capacitance has a temperature dependence given by: c = 0.20 + 0.14T + 0.023T2 the units for T is temperature in Celsius and c is measured in cal/gK. 2.0 g of the material was...

Hello! (Wave) I want to show that the domain of any partially defined recursive function is equal to the range of some ( totally defined ) recursive function. I haven't understood which is the difference between a partially defined recursive function and a totally defined recursive function...

Hi everyone! Please help, I have spent some considerable time to understand the two concepts and still this is nagging at me... I am relating to Structural Engineering, just to let you know guys. My question is .. Moment of inertia is about distribution of mass, the further away from the axis...