Classical Physics

I was wondering what wind really is? it's not a solid and it's not a liquid, in yet it can effect us, interact with us, we know how to harness it and create it, but have we really asked our selves what it really is? I know that this might seem insignifigant but if this is insignifigant then everything is and if everything is then there'll be no progress. and also what is it that makes it move, why does it move, why isn't it affected by gravity? this is something that is like gravity, we can't see it in yet it effects us, keeps us on the ground and it's also invisible to the human eye

This isn't homework...I'm reviewing physics after many years of neglect. Given 2 masses, [latex]m_1, m_2[/latex], connected by a rigid, massless rod, stationary with respect to a ramp which makes an angle of [latex]\theta[/latex] with the horizontal, with coefficients of static friction between the masses and the ramp = [latex]\mu_{s1}, \mu_{s2}[/latex] respectively, what is the magnitude of the tension or compression in the rod, and what are the magnitudes of the static friction, [latex]f_{s1}, f_{s2}[/latex], acting on each mass? This assumes [latex]\theta[/latex] is small enough that the masses do not lose traction, i.e., [latex]\theta \leq \arctan \frac…

In my high school physics class last year, I was dissapointed to hear that machines can never be 100% efficient. They will always lose energy through heat or some other medium because, to me, "that is just how it works." Is there any debate open to there being a 100% efficient machine, or is it literally impossible? I have had dreams of a magnetically powered self-sustaining engine, but it can't happen.

If you had a spinning disk inside a fluid, what would describe the motion of the fluid?

I'm using a circle diagram to derive the formulae for linear quantities in terms of angular ones. Radius r is used as a scaling device more than anything taken from the know formula for displacement in terms of angular displacement. radius × angular displacement = |linear displacement if object continued on linear trajectory, arch length| (radius × angular displacement)/time = radius×(angular velocity) = |linear velocity, tangential velocity to be precise| (Radius × (angular velocity))/time = radius × (angular acceleration) = tangential acceleration. radius × (angular velocity × mass) = radius × angular force = tangential force. Torque = r × tange…

I have a basic question. My science teacher is talking about momentum and inertia because we are going over the laws of motion, and he gives us the formula for inertia for the first law, which is I=mv, and then he gives the equation for momentum, which is p=mv. Why are the equations the same for momentum and inertia? My science teacher just said that inertia is a property of a unmoving object, and momentum is a property of a moving object. I get that, what I don't get is why, quote "Inertia stays in an object even when it is moving, but momentum goes away when an object is not moving." So to clarify, what he said is Inertia will be in an object no matter what, moving…

L=vmr (angular momentum) If an object 'm' is moving and has a reference point 'p' that is a distance r from the object, is the angular momentum of the object its capacity to rotate a light plank fixed to point I know the torque is the change in angular momentum over time, but is L simply tangential velocity times mass times r or angular velocity times mass times r? I don't know what it is.... Angular velocity is theta/t = w, so is does L = wmr and not vmr?

Angular displacement times r = |Linear displacement| (Intuitively I understand this but i can't put it into words, I know r*theata = L and if L = 0 then L after t seconds is the size of linear displacement t seconds after the object is released from the centripetal force) Angular displacement over time = |Linear velocity| (as the size of the velocity is constant and acceleration only changes the direction of the object) v = r*w, I would like to know what this means, when looking at a situation, what is the significance of it, can I express angular velocity in terms of angular velocity? Is, that the tangential velocity of an orbiting object is equal to distance tr…

We all know Newtons refraction with a prism. We also know that light is essentially a beam of photons. In the light of this how do we explain refraction in terms of the incident photon beam. How "intelligent" is the photon in this regard? Please advise. Your views will be appreciated. Thanks in advance.

I was looking for the equation for acceleration, and I found this webpage: http://www2.franciscan.edu/academic/mathsci/mathscienceintegation/MathScienceIntegation-836.htm However, this equation doens't help me, because in my current situation, I don't know the final velocity. I know the starting velocity was 0 m/s, because the object whose acceleration I'm trying to calculate started in a stationary position. What's the equation for figuring out the acceleration if you begin at rest, and then traverse d meters over the course of t seconds? Obviously, the AVERAGE velocity would be d/t, but how do I calculate the acceleration?

for example, when galileo (or whoever it was) first proposed that bodies will fall at the same rate in a vacuum regardless of mass, how many times did this have to be tested before it became accepted? (also, is the above example a law?) (and is it true that Aristotle had said the more massive object will fall faster than the less massive object?)

Is momentum conserved in every interaction, or only in closed systems? If momentum pops into existence at one end of the universe and cancelling momentum pops into existence at the other end, is that conservation or is it breaking conservation twice?

Hypothetically if we could create a David and Goliath scenario in the lab (With a 9 foot Goliath) what would the ideal size of a projectile from David's sling be to slay the giant? Does the story gel well with physical parameters? How muscular a David would we need to overcome the physical limitations of force? Any thoughts? (Also the story is based in fable the analogies are real, that is why i thought of this conjecture).

Been reading too much recently! How does Classical Physics possibly differ from Quantum Theory?

suppose i have 4 solids like this: and the solid have shear stress and tensile stress 12N/mm2 and 15N/mm2 respectively, suppose i know the area of each surface, how can i judge whether this solid is able to withstand 20N load? what kind of formula should i use?

Why is CMBR in the microwave range? (Eg. not in the radio freq range).? Or is this restricted only to the known Universe?

1. a pseudo force acts on a body that is at relative motion or rest to another body if the body is disturbed. - it is the force of friction/cohesion that exists between the two bodies. a sudden change in velocity does not correspond with an equal change in the dynamic cohesive force causing relative moment, known as the force of inertia. 2. a body reaches terminal velocity in motion against friction. - any frictional force exactly equals the force of gravity?

I have an egg drop project due this upcoming friday. I'm aiming for the double-not-so-secret-extra-bonus credit which basically means.... - 2 eggs - no parachute - dropped from 10 meters (school flagpole) - must fit in a 5 gallon (12 inch diameter, 14 inch height ) bucket - can use any materials, but nothing can be directly attached to the eggs. - teacher provides eggs so no hardboiling - best design get extra credit on top of all that double not so secret extra bonus credit. help?

Hello, I have a problem with OCT setup I am trying to make. The setup is based on Michelson interferometer with mirrors in the sample and the reference arms. Light source is 639 nm high-power (up to 150 mW) diode laser running in CW mode with coherence length ~150 microns. After the laser I have non-polarizing cubic beamsplitter (50%/50%). The mirror in reference arm is modulated by PZT (2.3 kHz, ~375 nm amplitude). After the reference and sample beams combined I have high-speed photodetector connected to the oscilloscope with 50 Ohms termination load. The photodetector is DET36A/M provided by Thorlabs (rise time ~14 ns, 350-1100 nm wavelength range, 13 mm2 active area)…

Hello there. I am working on a project that requires the long-wave IR monitoring of a powder bed. The bed is in a restricted access chamber and therefore optics have to be used to reflect the object. This is where the problem arises, my intention was to use a Enhanced Aluminium mirror to reflect the objects emitted IR into the camera, however the chamber is heated to 178 C therefore the mirror itself emits its own IR. I am using an FLIR E40 IR camera. Doe anyone have any ideas how to tackle the problem?

Consider a particle moving in a path described by a concentric helical spring How would you mathematically describe the displacement when the spring is expanded. As the particle is displaced along x, y and z axes simultaneously. Do we need partial differential equation in 3 dimensions to describe the motion? Please advise. Thanks in advance.

There was some physicist who said that the volume of a planet (or another space body) doesn't matter because the force it exerts is the same if its volume is higher or smaller. For example, the force between Earth and Sun doesn't depend on the volume of Earth or Sun, only depends on their masses and the disance center-center. So... I don't remember who said this and what said exactly. So if someone know it, it would be vere nice from him to tell me :DD P.S.: I hope you to understand my poor English >.<

Dear all, I am going to realize an experimental optical setup and I need your suggestions to make the correct selection of lenses. A polychromatic light beam coming from a monochromator (400-700, slit dimension: 1 mm) has to be focused onto the base of a cylindrical lens (acting as a prism). I need the light beam striking onto the glass prism being almost parallel through the path along the prism. I think that a convergent beam with a section of 2 mm can “simulate” this ideal situation. Can you suggest me a combination of lenses able to direct the light beam from the monochromator to the prism? Thank you in advance

Will the idealized cold fusion reactor be as efficient as a fast breeder nuclear reactor that is currently employed in industry? Please elicit your perspectives on the subject.

Hi! Need help=( Just noticed a small difference in B-H curve of FeOx nanoparticles placed in paraffin and polymer glue. In particular, coercivity increased(in superparamagnetic particles) in glue comparing to paraffin. For me it sounds quite crazy and it appears to ruin the precision of measuring B-H curve of particles. Measured using VSM. So the questions are - is it normal? How can one predict this effect? Or the VSM needs verification? Thanks in advance.