Relationship Definition and 999 Threads

In high school, doing modern physics, and was struck by a thought about light, energy of a photon and the "speed limit" of relativity. I'm probably very wrong, but I would like to be shown why :) My understanding of energy and matter relations is that when you increase the energy levels...

Homework Statement I am working with an electronic bathroom scale and now have to find the relationship of the applied load which is mass in kg against the beam surface strain. The maximum load is assumed to be 75 kg. Homework Equations (M/I)(h/2)=Eε A picture of the beam has been...

I'm not sure if I did these 2 questions correctly, so would someone please check my work for any missing ideas or errors? Question 1: Homework Statement Prove: For every x belongs to X, TR∩S(x) = TR(x) ∩ TS(x) Homework Equations The Attempt at a Solution TR(x) = {x belongs to X such that...

"If there's no normal force, there's no contact." Is the statement above correct? What is the relationship between contact and the existence of normal force? Are they necessary and sufficient conditions to each other? Thanks for your help :p

Imagine a ramp setup on top of a tall table. The height Δy is measured. To find the initial velocity at the instant the ball leaves the ramp, I set up the kinetic energy and potential energy equal to each other to find the initial velocity of the x component. PE = KE m*g*(hr) = 0.5*m*v^2 where...

How can one derive the relationship for a cubic crystal: d= \frac{a}{\sqrt{h^2 + k^2 + l^2}} It is shown here. This is probably trivial but I am having trouble proving it as the Miller indices are reciprocals but the reciprocal is not distributive. This isn't for homework by the way - I...

Homework Statement In the experiment, a mass was attached to the string. Increasing mass was added, and the fundamental frequency for each mass was determined. I am trying to create a graph from the data, but I am finding that I am getting a linear graph between f1 (fundamental frequency) and m...

Hello, having had an interest in physics for a while I recently enrolled on an access to higher education course to study it. Unfortunately I seem to have fallen at the first hurdle. First off I'd like to apologise profoundly and profusely for the simple problem you are about to read, but I have...

How fast do i need to pump water in a 10" aluminum pipe to prevent freezing? Assume 32*F inlet temp and 0*F ambient . For my conditions, the temps will vary and T ambient easily gets down to -20*F or more.

Homework Statement Impulse is defined as: force x time a) Find its unit expressed in term of the base units. b) What quantity has the same unit? What could it mean? (Impulse = change in momentum) Homework Equations I = F x T P = mv The Attempt at a Solution a) First, we...

I am writing a report for my civil engineering subject. and i have few questions. is there any relationship between angle of repose and total soil suction. is there any relationship between angle of repose and particle size distribution. is there any relationship between angle of repose and...

Hi ! I need your help ! I have been kind of stuck with the following problem for a few days : I made measurements on a plate radiating sound with an accelerometer and I found very low values of displacement(1-10 pm !). It seems very very very low (less than 1 atom !) Depending on the...

Homework Statement E = [axhat(A(x+y)) = ayhat(B(x-y))]cos(wt) Determine the relationship between A and B Homework Equations I don't know if there are any.The Attempt at a Solution I've expanded the problem and reduced it to E = cos(wt)[x(A+B)axhat + y(A-B)ayhat] I was going to take the real...

Homework Statement (Picture attached) How does the process of sea-floor spreading produce these orientations and relationships [between the ages of magnetic stripes and the distance from the ridge crests, as well as the parallel direction of the magnetic stripes with those of the ridge...

Let t \in \mathbb{R} be large. Let f be a function over [0,t] satisfying f(0) = 1 and f'(x) = e^{-f(x)} for all x. Let g be a function over [0,t] satisfying g(0) = 1 and g'(x) = (1 - g(x)/t^2)^{t^2} for all x. Note that g'(x) \sim e^{-g(x)}. Without solving the two...

Homework Statement Is momentum and kinetic energy related?Since when an object is falling,it gains k.e and also gains momentum? Homework Equations The Attempt at a Solution

I've been spending far too much time on this problem and I know I'm over thinking it. Here it is: If |A+B| = |A-B| What is the most general relationship between the two vectors? -Now I know this is just saying they have equal magnitude regardless of direction, but I'm not quite sure what...

Is there any relationship between the pH of seawater and any properties of the sand at the beach? If so, what/ why/ how? Context: I am writing a report for my Soil Mechanics course, for which we analysed some sand we collected at the beach, as well as some seawater. One of the key properties...

Hi everyone, This is not a homework question. I just want to understand an aspect of linear regression better. The book "Applied Linear Models" by Kutchner et al, states that a linear regression model is of the form Y_i = B_0 + B_1 X_i + \epsilon_i where Y_i is the value of the...

P = VI . Now say I want to transfer power over long distance, i put it through the the transformer increase the voltage to decrease loss over the line, this is where I am confused. So when u increase the voltage through the transformer, you decrease the current. Voltage is the potential...

I mean how can i analysis the thermal conductivity of two structures with their phonon spectrum. thank you!

Hi, I have scoured through scores of websites but haven't found a reasonable solution. The thought problem goes like this. Take any NdFeB magnet which is saturated say to B_r =1.3 T. Is there a magnetization (M) value that corresponds to the this remanence. I have been able to find a few...

Hello, it is possible to prove that the Mellin transform of a function f(x) can be expressed in terms of Fourier transform, namely: \mathcal{M}\{f(x)\}(s) = \mathcal{F}\{f(e^{-x}\}(-is) I am not convinced of that imaginary unit i as argument of the Fourier transform. In fact, since the...

If I set up an experiment as shwon in the schematic attached, where the effective length of the tubing is 25m (this then goes to a short length of smaller area tubing), and the pressure applied is contant, what kind of relationship should I expect between pressure drop and flow rate? I...

I am trying to teach myself some chemical thermodynamics, in particular some methods for fluid property evaluation. I am reading an excellent book which has helped a lot ("Introduction to Chemical Engineering Thermodynamics", Smith-Van Ness-Abbott, Ed. 7, ISBN: 007-124708-4). One thing that...

Consider the following system - A coil is wrapped around a soft iron core as shown below. A permanent magnet is placed at one end of the coil. +--+-----+--+ | | | | Coil +ve Side --> | | | | --> Coil -ve Side...

Homework Statement This is, strictly speaking, not a homework question. I have already solved this, but I think that there is a much better method to solve it. In the equation below, what relationship must w and q satisfy? If the question is not clear, please read the bottom of the post...

Homework Statement I did an experiment with a convex lens, object, and image. As the lens moved farther and farther away from the object, the image decreased its distance (to remain in focus) from the object as well up to a certain point. After that point, as the lens increased its distance...

So, my intuition tells me that as a material heats up, the atoms start jiggling around more and more. That makes the atoms got all over the place, effectively causing more space between the atoms. Since there is more "free" space between the atoms that the electrons can travel through, the...

Homework Statement A practice problem showed the relationship between frequency and wavelength to be inversely exponential. I don't understand why is the graphical relationship is not [instead] inversely linear. What concept am I missing? (No calculus please... I'd be clueless :biggrin:)...

Homework Statement I'm having trouble understanding the relationship between pressure, speed, and displacement to answer the following question correctly: While you are stopped at an intersection turn lane, a large truck zooms by, just a few feet from your car. As the truck passes, your car...

So if you have a countably infinite set \{ x_n \} and consider also the sequence (x_n), what's the relationship between \sup \{ x_n \} and \limsup x_n?

I don’t’ have any background in physics and SR/GR is something I became very interested in just over the last few years. Most of the concepts I seem to get, but I have not engaged with the math to any great extent. The one thing that keeps cropping up for me is the relationship between light...

Homework Statement You're pushing a car up an inclined plane (a hill). Which graph matches the relationship between ∆x and v? Homework Equations W = K.E. + P.E. thus: F∆xcos\theta = 1/2mv2 + mgh The Attempt at a Solution The answer is C. I thought the answer was D - I don't understand why...

Since the capacity of an air conditioner is a function of outside air temperature, does it follow that greater efficiency will be achieved by putting the condenser under shade rather than out in the open or on a hot roof? Or does the casing of the unit provide adequate shading to make this...

Since I was 8 years old, I thought I would not have much trouble in making friends and maintaining social relationships with others if I am always honest and kind to everyone. However, as I get older, I realized that being honest and kind will not always guarantee an impeccable social...

hey! Pressure and Volume are inversely proportional to each other When you decrease the volume, the pressure increases. However, when you increase the pressure, it seems to me that the gas molecules want to spread out more and the volume would increase, but boyle's law says that it should...

Hi, I was considering the notion of studying both physics and chemistry, but am reluctant to decide definitively so. I am wondering if anyone knows if there is a relationship between the two, in that they compliment each other, because I plan on doing research in the field of physics. Does...

My girlfriend is re-learning geometry. She has noticed that the sum of the angles of a triangle is equal to the measure of a straight angle and half the measure of a full revolution. She wants me to ask if there is any special relationship between a triangle and a straight angle or between a...

Observations show that the current density of the Universe is close to the critical density: rho = 3 H_0^2 / 8 Pi G Assuming a spherical observable Universe of constant density, together with the relation c = H_0 * R, one can rearrange the above equation to give the relation: G * M / R...

Hi, This is a general question rather than an explicit question, so apologies for not using the template. I'm a bit confused by the relationship between frequency and data rate in a communications system and wondered if someone could help clarify please. Say I want to achieve a data...

Hi, I have a terrible time when solving Inclined Plane problems when it comes to dividing the weight component into two. I can't see why, to find the perpendicular component I do the cos Theta of the weight and the parallel component I do the sin Theta of the weight. Can anyone, (maybe on...

Homework Statement On book 'Switching power supplies A to Z' page 73 at the bottom, (please kindly proceed to the link below for that page) http://books.google.com/books?id=cuyyQ3N_8hIC&lpg=PP1&dq=switching%20power%20supply&pg=PA73#v=onepage&q=switching%20power%20supply&f=true It stated...

I have been told that the hydrogen ion concentration of an acid in solution depends on temperature. What exactly is this relationship? Is there a formal equation that relates [H+] and temperature, as well as any other physical variables that may have an effect?

Hello everyone, In Fermi Liquid Theory, I'm trying to understand what the relationship is between the Green's function and the average occupancy of levels. In my lecture they gave the relation \left\langle n_k \right\rangle = G(k,\tau\rightarrow 0^+) Anyone know where this comes from...

i was wondering if there is a relationship between mass and temperature that would allow me to calculate the surface temperature of a blue super giant of 24 solar masses? or do i simply need more information to do this

i've always wondered this...

Hi- This lab question has me stumped... Homework Statement Derive an equation describing the effect of the control voltage on the pules width for a 555 pulse width modulation circuit (monostable circuit). Homework Equations width = 1.1*R*C The Attempt at a Solution I took...

Hi, All: Given a simplectic vector space (V,w), i.e., V is an n-dim. Vector Space ( n finite) and w is a symplectic form, i.e., a bilinear, antisymmetric totally isotropic and non-degenerate form, the simplectic groupSp(2n) of V is the (sub)group of GL(V) that...

So I'm a physics student, obviously I don't believe in God or religion, and I can be pretty hostile towards it at times. I recently met a girl who I'm pretty into, but she's deeply christian. I plan on "telling her how I feel" tomorrow, but I'm just wondering... do you think a lasting...