AskPhysics

I had an idea in a dream where a pressure vessel had a buoyancy valve at the lowest point. The idea was that a ball would sit in a hole and water that may condense inside the vessel would lift the ball allowing the water to drain after which the pressure of the vessel would seal the ball back into place. That made me wonder about the possibility of a pressure based buoyancy valve and whether the physics were there.

Just musing here, I've been a proponent of new ether theories the past few years and so there's some assumptions that go into this.

1. Spacetime is a fixed grid with planck-length-cubed voxels.
2. Information can travel through the grid at 1 planck-length per planck-second.
3. Particles evolve from this grid to perform some function, typically related to self-propagation.

I would posit that the big bang theory makes no sense. A tiny spec of everything which may or may not be finite just kinda gesundheit's itself into existence for no particular reason and then sputters out over trillions of years.

Nah I'm with Max Tegmark, we're an information set, since everything in physics really boils down to information anyhow. What makes more sense to me is if the big bang is instead a white hole, spewing information from some source of random information, possibly the digits of pi or some such.

Back to ether theory, the Permittivity of Free Space can be looked at as the inverse and called the "Electric Tension" [Roychoudhuri 2021]. This is the fundamental resistance of space to accept new information, and conducting Roychoudhuri's experiment (Michelson/Morely in hard vacuum) could verify that this is indeed the bedrock of reality.

So back to a graviton, what would it need to do?

1. Undetectable. The graviton must be smaller than a photon and much smaller than an electron. The diameter of an electron seems to be 10^20 Planck-Lengths.

2. Emitted from all massive particles.

3. Carries information about where the massive particle that emitted it is.

4. Collides with larger particles, with the negative direction vector being the source of the emission.

So what about the particles? Well an electron is ~~(10^20)^3~~ 10^20-cubed voxels, so there is room for extremely complex structures in there, and I would posit that massive particles (and photons) exhibit intelligence and try to survive. What would they use gravitons for?

1. Emitting gravitons causes the particle to decay. Absorbing gravitons prevents this decay, therefore it is advantageous for the particles to move close together, as this increases the absorption of gravitons.

2. The direction vectors of incoming gravitions are summed up and the direction with the most mass is where the particle tries to go.

So what do you think? Do gravitons exist? If they do they're basically the particles shooting spit balls at each other. We can talk about time dilation next.

I just wrote this article and I would like your comment:

The Universe Will Not Die a Heat Death

We assume that the universe is expanding according to the Lambda-CDM model with a fixed Lambda constant.

Imagine a central star, like our sun. Two artificial satellites are orbiting this sun in circular orbits in opposite directions. As the universe expands, the orbits of the satellites are elevated, and the satellites thus gain mechanical energy (the sum of potential and kinetic energy). This energy can be released by causing the satellites to collide or by simply having them graze each other. As a result, some of their kinetic energy is converted into heat, which can be radiated away as thermal radiation, and the satellites descend to lower, more inward orbits. The process can then begin anew.

Plausible Explanation for Magical Energy as Matter

1. Fundamental Theory

In this universe, magical energy is a form of matter that exists in a different state, much like how water can exist as ice, liquid, or vapor. This magical matter, while not visible to the naked eye, can be converted into physical matter under certain conditions. This follows a modified version of the law of conservation of mass, where the total mass of both physical and magical matter remains constant.

2. Energy-Matter Conversion

Magical energy can be transformed into physical matter and vice versa through a process known as magical transmutation. This process requires a catalyst or a magical conduit, such as a wand, spell, or specific ritual. The efficiency of this conversion depends on the skill of the magic user and the complexity of the desired transformation.

3. Energy Density and Storage

Magical matter is highly energy-dense. A small amount of magical energy can be converted into a significant amount of physical matter. Conversely, large amounts of physical matter can be converted back into a compact form of magical energy for storage or transport.

4. Practical Applications

Materialization: Wizards and sorcerers can create objects by converting magical energy into physical matter. This includes anything from simple tools to complex machinery or even living organisms. Healing and Regeneration: Magical energy can be directed to convert into biological cells, repairing damage or regenerating lost limbs. Teleportation: Matter can be converted into energy, transported across space, and then reassembled at the destination, allowing for instantaneous travel. Energy Sources: Magical matter can be converted into various forms of energy, such as electricity or heat, providing a limitless and clean energy source.

5. Scientific Integration

In this world, magical researchers and scientists work together to understand the principles governing magical energy. They develop magical physics, a new branch of science that studies the behavior of magical matter and its interactions with physical matter. This field explores the conservation laws, energy states, and the quantum mechanics of magical particles.

6. Limitations and Risks

Complexity: The conversion process is complex and requires precise control. Mistakes can lead to unpredictable results or dangerous side effects. Energy Loss: Some energy is always lost in the conversion process, usually as heat or light, in accordance with the second law of thermodynamics. Ethical Concerns: The ability to create or transform matter raises ethical questions about the use and control of such power, especially in terms of creating living beings or manipulating natural resources.

Could you please focus on engaging in academic conversations and constructive criticism? If you feel the need to downvote, I kindly ask that you provide an explanation for your opinion. Let's foster a thoughtful and respectful dialogue.

Im in the process on building something similar with the rack you see in the picture.

What I want to know is if its possible to determine the optimal length of the tube on the frame and on the rack to allow the max load under stress without the rack breaking/bending on a spot that its not mounted on the frame, and what would be the max load?

and if it is, how to calculate it? :)

things that i know:

• number of tubes
• length
• diameter
• thickness
• bending tube angle
• stainless steel type

worth saying that this is more of a learning exercise.

My understanding is that "what happened to the antimatter?" is a bit of an open question. How sure are we that all of the matter we can see is in fact matter, and not antimatter?

Antimatter has the same mass, electromagnetic spectra, falls down, etc. Do we have a way of determining which version of matter distant objects are made of?

I think I need to rephrase the question. I'll post again in a few days.

The replies so far have generally been very polite, given the subject. I was nervous about that. Thanks everyone!

... Hear me out, okay?

Back in 2000 I took my first solo, out of state trip, to meet an online friend. When I got off the bus, she greeted me, and let me know that we had to go stop by her friends house on the way back.

She was Wiccan and needed some Spiritual guidance because the night before she saw a black portal open up in the corner of her room that was giving her really bad vibes.

It wasn't my thing, but I never discounted it. Maybe it was real, and if nothing else it's just how her mind is rationalizing things.

But I guess my question is: Does the Scientific Method rule out the possibility that a "real" portal appeared in her room?

Taking wave function probability into account and the absense of data from the room, is it fair to say that the scientific method doesn't rule out the black portal being real?

Looking for black and white answers if possible, but I'd also love to hear your reasoning~

Is it possible to determine the percentage of the gravitational force at a specified distance using only the geometry of the planet?

Example: The ISS at ~420km altitude "weighs" about 90% of what it would on the Earth's surface.

Is there an equation using only geometrical values that would give you this info?

Sorry if this is a naive question (I am in high school), but why do we always talk about ‘ideal’ stuff in physics? The conditions are not possible in real life so why bother with them, won’t the numerical values not accurately represent real life situations?

Edit: I assume we’d at least have to take intended acceleration and the mass of the spacecraft into account, at least, right?

All blades have the same size, 36cm long, aerodynamically well shaped. But. The first weighs 120g, the second 125g… And the third one 210g… This is a small problem. So what are my options now? Making a new blade would be the last option, but do I have any other options?

Pressire acts on all directions, which means that pressure has a direction to act upon, allbeit plural. A scalar quantity is a force that has no direction to act upon. How is pressure a scalar quantity? Shouldn't it be a vector quantity?

In school, I was taught that the speed of light is constant, in the sense that if you shoot a laser off of a train going 200 km/h, it still just goes at a speed of c=299,792,458 m/s, not at c + 200 km/h.

What confuses me about this, is that we're constantly on a metaphorical train:
The Earth is spinning and going around the sun. The solar system is going around the Milky Way. And the Milky Way is flying through the universe, too.

Let's call the sum of those speeds v_train.

So, presumably if you shoot a laser into the direction that we're traveling, it would arrive at the destination as if it was going at 299,792,458 m/s - v_train.
The light is traveling at a fixed speed of c, but its target moves away at a speed of v_train.

This seems like it would have absolutely wild implications.

Do I misunderstand something? Or is v_train so small compared to c that we generally ignore it?

Electricity is in the form of electrons, which have mass. Everything that has mass is influenced by gravity. Therefore, why doesn't electricity fall down to the ground due to being influenced by gravity?

The reason planets orbit stars is due to gravity. The reason stars glow is due to heat. What's the reason for gravity existing?

What are your plans for this community or is it abandoned?

Also, would a region of space where light spends more time traversing it become more massive than a similar region of space where light doesn't spend that much time all else being equal?

Greetings everyone.

Just migrated from reddit. Love to see birth of the communities I was once subscribed to on reddit.