Classical Physics

There are sunlight reflection on the wall which from the convex mirror. The reflection area is two times larger than original size of concave mirror. Can I know how to calculate the focal length of this convex mirror? Thank you for advance.

Hello. I have conducted a measurement recently which showed that I measured in excess of 1500 microteslas from my smart TV. The smart TV was unplugged from the wall and so was therefore turned off. My question is, would this be a normal measurement for a smart TV, and if so, what would be inside the smart TV to cause this measurement arise?

Not sure where this goes but here we go... So light bounces off every object going in every direction hits parts of your eye where you don't see the object.. look at something and all around that something light should be hitting your eye thus causing you to see that color everywhere.. include all objects and we should see a bunch of colors everywhere and not individual objects, right? Also with this how do cameras work if color from every object is going in every direction hitting all parts of the lense? A camera shouldn't work and shouldn't of been able to be built based on all this, correct? See what I'm getting at? This is like a omg moment... also how come you can s…

Classical physics refers to the branch of physics that deals with the study of the behavior of macroscopic objects at speeds much slower than the speed of light. It is also known as Newtonian physics or classical mechanics, as it was founded by Sir Isaac Newton in the 17th century. Classical physics encompasses the laws of motion, the conservation of energy and momentum, and the study of forces such as gravity, friction, and electromagnetism. It describes the behavior of objects ranging from particles to planets, and is still widely used in many areas of science and engineering today.

Hello Since the Earth rotates, what would happen if you take an helicopter, and stay above the surface for 12 hours ? Would you arrive at the opposite of the Earth ? Hmm I guess the wind would bring you with it, so let's say you do circles with a supersonic aircraft, what would happen ? If you don't arrive to the opposite of Earth, because of which phenomenon ? I'm not sure to understand why things above the surface would rotate too, except maybe the wind bringing you with it...

I remember been taught at school that the electricity is a movement of electrons. Ok, it's nice and clear. But then I found out that the speed with which electrons are moving in a wire is millimiters per second. It doesn't make sense to me. So what is electricity if it's not a movement of electrons and what is the speed of it?

If a gust of wind blows at constant speed, it can demolish a wall - so what is the mass of the wind (where do you start measuring the length of the wind)? And isn't the acceleration 0? So what is the force of the wind?

The question is contained in the title text, though i'm not sure if this is the appropriate place (forum) to ask the question. Thanks

This video is trying to explain how an oscillating electric field of light interacts with the oscillating electric field of electrons as the light passes through a material. He seems to be saying that the wave from the electron is slower than the light wave, and when they combine, the light slows down, though he doesn't say that explicitly. So my question is: wouldn't the waves of the electric field of electrons also go the speed of light? If not, what speed does it go? Start the video at about 6:20 when he starts to explain what I am trying to understand.

Alternative wordings/synonyms such as "disappears", "no longer exists", "vanishes", etc. may be substituted in place of "destroyed" (Carnot Reflections, Appendix A). When "heat" (as a form of energy transfer) goes out of a working fluid as thermodynamic "work", my understanding is that the working fluid undergoes a drop in temperature as a result. In other words, a change in the total energy of the gas (working fluid or air, in a hot air engine) is measurable as a change in temperature. If the energy supplied to the engine in the form of heat goes out of the engine in a different form (mechanical motion of the piston, flywheel, etc.) Then the energy that fo…

As I do not wish to ignore replies and comments, quite the contrary, I will attempt to follow up, and or address any additional replies and comments here, if that's OK. Or you (someone?) tell me where my making a response to replies and comments is allowed. It appears to me it is when I DO respond with evidence in support of my observations, theories or statements etc. That my threads are abruptly shut down.

If we have a completely flat surface on a planet.......... What would the inhabitants of that planet see ??? A hollow bowl like valley with 4 mountain peaks @ the 4 corners ? Like this * but here the sides are straight and perpendicular in that case they would have slopes.... it was difficult to design the exact shape ....😁 And if we pour some liquid say water on that flat surface how would it stand there ? like a water dome ? And again how would those who are on the surface see that water dome ? a lake with flat surface in the middle of that hollow bowl …

Greetings. A hose/pipe/tube is friction push-inserted into a vessel tight hole. Transport yourself to the interior of the pressurized vessel. You can see the inserted pipe end that supplies the pressurized -say air-. There is in-diameter and out-diameter, corresponding to inside area; outside area, and the smaller torus area from the pipe wall. What is the force the air pressure in the vessel pushes the pipe out towards unplugging it ? ---> force = pressure / area Which is the area to consider ? inside, outside, torus ?

The Earth is accelerating and the acceleration vector points in the direction of the Sun. Is something lighter on the side facing the Sun than the same thing on the side facing away from the Sun? If not, why not. F = m(g-a) so total a is smaller on the side facing the sun.

Is these things tat i write right ? If there is a part in a planet that have bulged out too much or concaved in too much............ The gravity of the planet would pull in the bulged out part and fill in the concavity and add the volume of the bulgness to the radius of the planet equally and also the volume of the concavity would be equally reduced from the radius .....

Which of ceramics, polymers, nylons, plastics or other materials that withstand heat up to 190 Celsius while being not heat-conductive itself?

Two questions about the doppler effect.......... Does it also apply in reverse ?? i mean a stationary sound source & a mobile observer ( hearer ) And .....does it apply to other forms of waves ? like electromagnetic ones ? or light ??? Thanx .......

When you push a piece of wood down in the water for example..... the buoyant force pushes it upwards till the piece of wood reaches the surface....... Is that the same force that pushes up a hot air balloon in the air ? I mean are these two forces from a same type ? less dense object submerged in a more dense one ? And if yes whats the source of those forces ? Where does that buoyant force come from and originate ? Thanx.........

What is the optimum radian and diameter of convex mirror should be apply to achieve the sunlight reflection to cover 5 meters height of wall? Thank you for advance.

I've read again that a space telescope is to orbit a point of equal gravity on a line connecting Earth and Sun. How is this possible, is there curvature causing attraction throwards this point?

inside planets................not @ the center but lets say like here Shown in the picture Is the gravity less than on the surface as there is some mass above and also less mass below your feet Or is the gravity more because your are closer the the center of mass ? Thanx

We have that some stars use the Carbon-Nitrogen cycle. Since this produces again the isotope it started with, why don't these type of stars last forever?

Hello, I just got asked this question in an online exam and I selected answer C. But the answer apparently is D....how? Surely the mass of the walls is completely irrelevant as it's not adding a force to either skater (There's no attachment to the walls), if the skaters had rucksacks on with different mass' then I would not select answer C. Totally confused by this one...

We have that a particle observed from far away takes an infinite time to cross the event horizon of a Black Hole. And the very same particle crosses the event horizon in a finite time (as measured by a clock on the particle). This causes a clash in my mind.