Classical Physics

Hello dear friends ! I conceived the following optical filter for improved stopband attenuation. I haven't found it described after a short search; an optics specialist (I'm not) could better tell if this filter is already known. Like an interferential or dichroic filter, it comprises thin layers of varied index over a substrate, so the layers aren't to scale on the sketch, nor are all reflections shown. As an original feature, some layers are coupled by fading waves resulting from the varied refraction indices and from light's angle. The fading layer attenuates light but is thin enough to leave some through, and within the passband only, the following resonating …

Part of an ongoing debate the questions are surely already answered somewhere, but we haven't found where, so we turn to the esteemed members of this forum in search of illumination: Thought experiment. 'Gas in a box' (there's a Wikipedia article by that title! but the math is above us...). Closed system, no heat in or out, etc., just the molecules bouncing off each other and the walls (which magically do not erode or change their elasticity, etc. etc). My friend says that if the system of molecules in the box is allowed to evolve for long enough, there is a probability approaching certainty that at some point an earlier state will be repeated, with all variables…

Sound waves are longitudinal so soud travels in the same direction of as the vibration. So if a ruler vibrates up and down how does it travel accross the room to be heard.

Hey, guys What are the arguments that show the invariance of the First and Third laws under the galilean transforms?

Hello. Could someone verify this notion about momentum.... thanks here is info: - The conserved closed system here, is a vehicle and the planet (via the road attached) - A stationary vehicle has no momentum - A moving vehicle has some momentum here is point to verify: A moving vehicle has created a quantity of momentum (forward direction for vehicle) AND it has created a quantity of momentum (opposite direction for planet) * So... the total quantity of momentum is exactly half each? As p=mv * So... the vehicle will have very small m and large v quantity * So... the planet will have large m and very small v quantity I wish to know if I can correctly state......…

For example, in an angular rotation, the direction of the velocity of angular rotation can be found using the right hand rule. A disk rotating clockwise has angular velocity downward on the rotational axis. Now, I want to ask, what does it mean by the angular velocity is downward? Isn't the angular velocity in the clockwise direction, so where does this downward direction come from? (Don't say, "it's because of right hand rule", because that's just begging the question).

A friend of mine said to me that every object has gravity and as a result if u place a man and a pen close to each other in the space then the pen will come closer to the man beacuse his gravitational force will effect it. Such an information seems really interesting to me and i would be grateful if someone could explain me what really happens. -Please explain them simply(15 years old) -Sorry for any english mistakes..didnt take the proficiency yet!

ok so this concept's been screwing with my mind so much... i get that if there's no bank then a = v^2/r. so we take the object's velocity, and the radius of the curvature and we can find acceleration. but when its banked, the whole friction and the normal etc BS comes into play and it throws me off... could someone please explain to me what forces we have to consider to find out centripetal acceleration and centripetal force on banked curves? please refrain from using equations, instead talk about the actual force you're talking about (i.e. the horizontal component of normal instead of n*cos(theta) or w/e). it makes it easier for me to understand the whole reason why …

ok, so i get that net force is calculated as m*a, but what about the actual force of the object would exert and not just the net force? for example, a 50kg mass is dropped from a 45m height with v1 = 0. how much force would it exert on the ground when it hits? surely not 450N (rounding gravity to 10 m/s^2 for simplifying calculations) because that would mean doesn't matter whether the object is dropped from 1m 10m 50m or 100m it would hit with the force of 450N, which doesn't make sense (if you drop a hammer on your foot from a couple centimeters it doesn't hurt nearly as much as if you dropped it from say, 1 meter). so how would you calculate the amount of force an o…

Dear Member I have a question related to Power Adapter combination. Example: I have two Power Adapters of 5V and 2A. I connect positive wires and negative wires of both adapters. How many voltage and amperage as the result? 10V 4A?

Here's an interesting exercise: The entire scenario takes place in one dimension of space. Ball B is at rest. Ball A has momentum pa. Ball A makes a head-on perfectly elastic collision with Ball B. Ball B then moves off with a momentum of pb. Prove that: [math]|\frac{p_b}{p_a}|<2[/math]

I am taking Calculus III for one of my classes and Im learning about solving for Tangent Vectors and Normal Vectors for a curve. I figured out a way to determine the g-force exerted on a "particle" at a particular point on the curve by using vector calculus. So, just for laughs, I wanted to find out what g-forces a particle would experiance on the curve f(x) = x2. However, in order to solve it, I need the parametric equations for f(x) = x2. Im trying to make the parametric equations work so f(x) is like a rollercoster. However, everytime I try and solve for the parametric equations, I get gravity working "upside down" and my "particle" slows down as it approaches th…

Hi all, I am trying to mathematically proof that one can neglect convection and radiation when two cubes (paraffin-based, 1x1x1cm) are in direct contact on one side whilst the other 5 sides are perfectly insulated. Any ideas on how to calculate the Nusselt number here? How do you justify that radiation can be neglected? Can convection and radiation actually be neglected? How would the mode of heat transfer be changed if the cubes were not perfectly insulated, but instead were surrounded by air? It would be fantastic if anyone could give me any hint! Many warm wishes and thanks so much in advance!

I'm not the brightest bulb in the box so I figured I would ask some of you for help on this. I'm curious- would we as humans be able to survive without electromagnetic waves? In the electromagnetic spectrum we have ultraviolet and infrared rays which are (unless I am misunderstanding this completely) two ways that sun energy travels to earth. If we took away UV and infrared rays, what would the effects be? Would plants still be able to grow? Also, visible light is one of the waves on the electromagnetic spectrum. Without it, would we only be able to see in black and white or would we not be able to see at all? Sorry if these are silly questions, I just have the "curio…

Let the word be known: Shoelaces are a pain in the ass. This man]] pretty much sums up my opinion of shoelaces. But, when I'm walking, the shoelaces coming untied at least makes sense; they're getting shook up. But... I just spend six consecutive hours at a desk, not doing antything with my lower body, and when I finally stood up, my right shoe's laces were untied. How did that happen? I thought an object at rest (the shoelaces) would remain at rest until acted upon by an outside force (e.g. my feet moving).

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the rain is falling down vertically shold a man who is running hold umberalla vertically or in tilted posiotion

In the context of a battery holding electrons which carry energy, which we use, what would be the maximum amount of energy that an electron can hold? On what parameters is the energy carried by an electron dependent? Is an electron relating to an atom of one element different from an electron belonging to the atom of another element? Is the capability to hold energy in anyway depend on the atom to which the electron belongs

Consider the following scenario. If there was a solenoid shaped into a sphere, connected to an ammeter and voltmeter, and there was a spherical magnet inside it, I have a few questions regarding this: 1) What is the magnetic configuration of most spherical magnets? I.e. are they simply horizontal? Is it possible for the north pole to be on the outside of the sphere and the south pole of the sphere? 2) If I shake the solenoid and the magnet inside it moves, would that produce an induced emf provided that the sphere rolls inside the solenoid?

Well, I guess the question says it all. It's a laser pointer- nothing special. It's nominally 532nm so it's a frequency doubled Nd type of some sort and yet it gives two different wavelengths of light. It certainly gives two wavelengths, I first spotted this using a diffraction grating but my direct vision spectroscope verifies the fact (as do two other gratings and they each give just 1 spot with a second 532 nm laser and a HeNe) As far as I can tell they are 532 and about 536 nm. but it's difficult to judge with my rather low resolution spectrometer The divergence between the two beams after they hit a grating is about 1.5 cm in 2 metres which pretty much tallies wit…

What is statistical mechanics ? Has it got something to do with probability ? Why are they different statistical mechanics like Bose-Eistein, Fermi mechanics ? And is the Kinetic Theory of gases related to this mechanics ? I know, I have many question , I just can't find any good material on this online.

The work done by a variable force with respect to x distance is the integral of the function of that force with respect to x distance. But say we have a variable force as a function of time, can we say that the integral of the force with respect to time is equal to the work done by that variable force as a function of time? Also, if I have the acceleration of a particle as a function of term and I have the mass of that particle, can I multiply the mass and acceleration to find a variable force as a function of time? My intuition says yes to both question, but calculating the work using distance gives different results from calculating work using time.

When force force is applied to mass does the mass is set into motion instantaneously

Some time before, after learning about the refraction and scattering of light in prisms takes place, I got moreover confused and could not understand why light does not scatter in rectangular glass slabs. Here is what I think should happen based on what I have learnt so far (attatched). I know it is completely incorrect, but I have tried in vain to get an understandable explanation of why it should not happen this way from my teacher. Only red and violet colours are represented as the light bends in the glass slab. Please help me out by giving a simple account of what is incorrect in this diagram. It seems like I could not post the image. It was a "png" file. Any w…

how does energy work is electricy only form of energy we can produce or is there other forms of electrictys we can at least in theory produce first think of basic idea of power generation then try to think how other forms of energy could work