Classical Physics

Trying to clear my doubts before my test. Thank you!

Trying to clear my doubts before my test. Thank you!

Trying to clear my doubts before my test. Thank you!

Hey guys. It's my first time here. The two problems below are virtually the same. I don't know the reason why the second has translational kinetic energy included while the first doesn't.

Thanks!

How can a nuclear proton represented with an electromagnetic field that is expanding maintain a particle structure of a nuclei as time increases. Does the nuclear electromagnetic magically not expand as time increases? What may I ask what is happening here? Some smart girls needs to do some cleaning to this sloppiness that the boys have made.

Einstein's (1917) energy equation E = mc^2 is used to justify the structural unification of an electron with a massless electromagnetic field but Einstein's inertial mass (m = E/c^2) is massless since E represents the energy of an em photon (Einstein, sec 15). Does this not prove that quantum electrodynamics, string theory, quantum field theory, quantum chromodynamics, plasma physics, condense matter physics, and particle physics that use the gauge transformation of Maxwell's equations is just plain incompetence in motion.

Newton's gravity equation is represented as: F = G m1 m2 / r^2 Cavendish experiment is used to justify Newton's gravity equation by calculating the value of Newton's constant G but Cavendish's experimental apparatus uses two lead spheres m1 = .73 kg and m2 = 158 kg separated by the distance of .23 meters that produces a force of 1.74 x 10^-7 N or 2 micrograms yet the measurement uncertainty in 1787 was one milligram. Can anyone explain what is going on?

Atomic physics is based on the electron-proton force yet only a hydrogen atom forms a charged nuclei. All the other atoms form a neutral charged nuclei. I was just wondering while I was combing my hair.

Hi all, So I'm helping my niece develop a science fair project (7th grade). She wants to calculate how much power she can generate by running a specific distance My question is, is there any difference in calculating the power (Work/time) via staircase vs. flat distance. I ask this, because in most of the physics examples I've seen that calculate human horsepower, they're usually done with a stair case, and the distance is measured by height of the staircase, and the force is the runner's weight in newtons. The staircase method is kind of annoying and would be easier for her to do with just running on a track field. Is there anything I should know abo…

Thanks!

Huygens refers to Roemer's measurement of the velocity of light since Roemer is accredited as the first to measure the velocity of light but Roemer did not observe a time delay during the interval FG or KL; consequently, Roemer's measurement of the velocity of light was negative. Can anyone explain what is going on?

Hello everyone I would like to see what is known about this subject by this community. This is something that has made me loose a lot of sleep. We all know what causes gravity. From what I understand, mass is the underlying component here. The higher, or more concentrated the mass is, the stronger the gravity. So, we definitely know what magnetism is, and as a result we have been able to reproduce it, essentially benefiting us directly. But we do not know yet what gravity is, because we have not been able to reproduce it like we have with magnetism. Correct? Please leave out artificial gravity like that of the space station by rotating something. As f…

Hey guys, I'm trying to find a formula for the amount of lift a plane will get from it's wings. I'm looking for net lift, as in the entire plane. I realize I have to make sure it's stable, etc. Either way, using the following variables: Wings surface area Angle of wings Velocity What formula will tell me how much lift the wings are generating? I've probably got the wrong variables. Any formula that resembles the solution to this problem helps. I believe this is it: https://www.grc.nasa.gov/www/k-12/airplane/lifteq.html But I'm not sure.

Here's the problem: You have a ceiling fixed punch bag. Find the minimum sensor setup to determine: 1. The force of a punch in the bag 2. The acceleration of the punch 3. The speed of the punches (if multiple punches are thrown) Limitations: 1. Sensors must only be attached to the bag. NO sensor can be attached to the person. 2. The bag is punched in a limited vertical area. Justify answer with sensors and calculations. Can you solve it?

Some opinions needed about practical reflectors for infrared spectrum originating from human body for use in garments: Is is possible to reflect infrared of human body with a mesh type reflector? Lets say perforated aluminum or mylar? Question is the effect of the holes in the reflective material and their effect. I have seen and experienced in many wood burning fireplaces a solid metal screen with round holes the size of 2-4mm effectively blocking the heat radiation. I have read about far-IR- metal mesh filters, where cross shaped perforations in the scale of the wavelengt desired to filter. But for the purposes of use in clothing, the micron-size-scale i…

How strong is the magnetic field that a hydrogen electron experiences from a hydrogen proton when the electron is in s1?

Hi everyone i took this picture in Jerusalem . take a look at it ​its see through ... you can see everything behind me and guys its NOT PHOTOSHOP took it with my own mobile phone and there is other pictures like this how come the camera lens can see whats behind me ? how come my body didn't block the light coming for things behind me ? Please dont leave any negative comments and lets try explain this

We know an electric generator on earth generate electricity . What if the same one is placed in space where there is no air and no gravitational force. will it generate the same amount of electricity ?

Are they from different energy family?

The Galilean addition for Velocities ? incorrect. First the speed of light is always the same../ in the Galilean addition of velocities ;the difference with the speed of the source in the train must be deducted from the speed of light not added . The Galilean addition for velocities evaluate an event in time without target like a magician . Let say a target is at 1 second in time, when the light switch is turn ''on'' by the man in the train ; if the train's speed is X the train will arrived at the target x- the speed of light ''not +''<< I'm I right ?

Please.an answer would be much appreciated .

Here is an example; of a space ship cruising at .25 second the speed of light with a source up front ''beam On.''I'm right to estimate the arrival time of the ship at 3 quarter of a second after the light; at target?

Lets start a thread that includes all important as well as useful concepts and equations commonly found in kinematics, mechanics, Newtonian physics and the whole classical physics in general. Lets see how far the list goes....... Newton's Laws of Motion 1. Every body continues its state of rest or uniform motion in a straight line until and unless it is acted upon by an external force. 2. The force impacted by a body is directly proportional to the rate of change of linear momentum. [math]F = \frac{dp}{dt} [/math] Or, [math] F=ma[/math] 3. Every action has an equal and opposite reaction. [math] F_1 = -F_2[/math]

When in a hollywood movies warplanes dive down, after being shot for instance, they 9 out of 10 make this distinctive noise of a Stuka Dive bomber plummeting to earth. We know that the Stuka bomber made this scary sound because the nazis put sirenes on them for the specific purpose of scaring the living daylights out of people on the ground. But does a normal airplane, going down with a considerable speed, make noise at all? A glider plane doesn't I reckon. So why would a normal plane with its motor still running?