Gravity Definition and 1000 Threads

That is: Potential energy: GMm / r Kinetic energy: ½ mc² phi = 2 *(GMm / r) / (½ mc²) This gives the full general relativity result — 1.75 arcseconds for light grazing the Sun — using a simple Newtonian energy ratio. The factor 2 is needed, not completely sure why. Mass cancels out, so any...

Title: Reframing Light Bending Using Density Instead of Radius I’ve been exploring an alternative way to express gravitational light bending, starting from the classical general relativity approximation: θ = (4 * G * M) / (r * c²) Instead of using radius r, I substituted it using the density...

Title: Gravity Proportional to Mass over Surface Area — A Dimensional Approximation I derived an approximation for surface gravity using the gravitational constant and surface area: g ≈ (4π G M) / A 🔍 What Each Symbol Means: • g: Surface gravity — the acceleration due to gravity at the...

As our space rock hurtles through the infinite void. Acting under the assumption that the fabric of spacetime is a 4 dimensional space if one were to travel to a point on that fabric for a value of time that our 3 dimensional planet has already been to given that we're traveling "through" time...

Hi. Following the classical mech. g=-GM/R^2, for quantum distances the gravity force would be strong. What are the quantum mechanisms that cause the effects of gravity to vanish? The position uncertainty or the probabilistic wave function can be a justification for suppressing strong...

Hi all, I just want to know what you suggest to the arxiv papers of Prof. G. Bianconi. Especially these two: Gravity from Entropy Quantum entropy couples matter with geometry Thanks in advance.

Is the speed at which the paper helicopter falls due to its increased weight because gravity is stronger, or is it because air resistance is unable to keep it in the air because the weight is stronger than air resistance?

I have seen largest guava fruits are in height of plant that is average of top most and bottom most fruit in the plant? can there be a scientific reason for these observation?

I tried out this free fall calculator, and it says that it would take 4.3 minutes to fall to Earth from 200 miles up. (The altitude of the space shuttle, but no horizontal velocity.) This intuitively seems very fast to me, even assuming no atmosphere. Am I using it wrong? It also gave me a...

Hello everyone. I have the following questions: 1. How and why did the theory of quantum gravity begin? 2. What is the objective of those who are dedicated to this research?

In 2011, a paper titled On the origin of gravity and the laws of Newton was published in the Journal of High Energy Physics, which described gravity as an entropic force based on the entropy of black holes and the holographic principle. This idea was subsequently named "entropic gravity". In...

Utdannelse i Mekanikk (phd). Leser på gravitasjonsteori ( generell relativitetsteori) i fritiden.

I read a paper published in General Relativity and Gravitation: On gravity as a medium property in Maxwell equations The argument of this paper is as follows in a nutshell: There are currently many analog models and theories of gravity, including some based on medium analogy. Analog...

Does it make sense to ask what the quantum wavelength of gravitation is? If it does make sense, is an explicit and quantitative determination possible?

https://www.livescience.com/planet-earth/rivers-oceans/indian-ocean-gravity-hole-the-dent-in-earths-gravitational-field-created-by-the-death-of-an-ancient-ocean This article has popped up on FB. A lot of people can't get their head around the idea that a localized low gravity area would cause a...

Why for gravity some things like planets, stars are heavy enough to have a gravity so they don't fall of the space? When a small object can free fall in space, why a planet has a gravity, and they are considered heavy to what formula?

The system is closed, and as much blood rises to a certain height, an equal amount descends from the same height, so the two liquid columns create equal but opposite pressures, and their effect on the heart is 'neutralized.' Therefore, if we ignore friction in the blood vessels, it shouldn’t...

Hello , I read the earth and the sun has a mass and google etc gives a measure . When I go the supermarket and buy 1 kg of bananas , they are weighed on scales . Is science lying about the mass of the earth and the sun ?

Would a gravity powered clock increase or decrease speed? Take an hourglass. It should increase speed as gravity increases because it's powered by gravity... But it should also decrease speed because of general relativity...

There are some hints from the orbits of known objects in the solar system that there might be a Planet X out there that has not been discovered. A recent study by Siraj et al. (the link is to a pre-print of the paper), analyzes a bigger data set (orbits of 51 objects v. 11 in previous studies)...

Would a body being carried up a set of stairs from one deck to another deck in a plane that is falling take less effort to move than if the plane was flying at constant altitude or ascending. ( I am thriller writer)

I derived the formula for the quadrupole radiation power emitted by a system of masses: $$P=\frac{1}{45}\dddot{Q}_{kl}\dddot{Q}_{kl} .\quad\quad (*)$$ Note here that: (1) I am using geometrized units, so ##c=G=1##; (2) ##Q_{kl}## is the quadrupole tensor $$Q_{kl} = \int{(3x_k x_l - δ_{kl}\cdot...

Gravity is considered as a bending of spacetime due to massive objects. And hence other objects around the curvature follow a geodesic path. My question is, why do they follow the path? Can't they be stationary? What's the cause behind objects even moving in the first place? I sometimes hear the...

I just saw a StarTalk video where Neil deGrasse Tyson says that gravity at the poles is lower than at the equator because, even though you are closer to the center, the mass around the equator outside the sphere below you somehow does not count (skip to 4:21 in the video). He is obviously wrong...

How do proponents of modified gravity explain the fact of observation of galaxies, the behaviour of matter in which does not require an explanation in the form of dark matter or modified gravity?

So one of the major topics in physics is trying to reconcile quantum mechanics and general relativity. And the classical expression of electromagnetism is Maxwell's equations, and its linked to quantum models of electromagnetism. And then there's also a gravitational analogue of Maxwell's...

[Mentor Note: Thread moved from the schoolwork forums to the technical forums, since it appears to be a real-world problem] If I have a water well 55m deep I want to suck water by gravity without any pump. I put a barrel of 85 liters and connect it firmly to a pipe of 55m length going into...

As bodies orbit each other they emit gravitational waves (presumably by emitting gravitons). There could be configurations of several moons around a planet (for instance) where the quadrupole moment does not change and is invariant. However, there could still be higher order effects, namely...

If I'm not mistaken, in interstellar gas, there can be clouds of free electrons (not "attached" to any atomic nucleus) But can they stay like that indefinetely? Or will they inevitably end up in atoms? And how are they holding in interstellar gas inside of galaxies? Are they gravitationally...

Consider a halo made up from massive and stable particles like neutrinos* (let's not consider protons which, although we don't have any experimental evidence showing that they are unstable and decaying, there are some GUTs proposing theoretical mechanisms where they could decay over extremely...

in an interview Michio Kaku was asked about Loop Quantum gravity and he replied that it is only a theory of pure gravity, but that the universe also contains particles, the particles of the standard model, and only superstring theory unifies both quantum gravity and the standard model. the...

I've been reading the book "Classical Mechanics" by John Taylor, and in the chapter about noninertial reference frames, it states that the direction of 𝑔 (the apparent gravity, which includes the centrifugal force) is not necessarily aligned with the direction of 𝑔0 (the true gravity direction...

I will try to hide how unintelligent and uneducated I actually am but I’m sure it’ll be showing throughout this question. My apologies. I really don’t know how else to find answers to questions I have besides coming to you all. In a nutshell, I’m trying to understand why an astronaut floats...

I am an author/novelist and I'm working on a huge science/fantasy project that's been in development for the past 5 years, and as a science fiction fan I've always hated when people get the science really wrong. So my question is: how would the gravity of another planet influence human...

okay I annotated the diagram given and the grey thing where they take y axis up as positive is what I understand to be, right? But in the answers, they start off by going V = u - gt. They've taken acceleration due to gravity as a negative value. Why? I thought the skateboarder was falling...

I can calculate the COG with the above formula however P2 is unknown. I need to be able to put P2 into another function which will check that the vector A->COG is parallel to the nominated angle. I cannot seem to work this one out algebraically. Any assistance or guidance would be appreciated.

Imagine making a hole in the ground, about a mile deep, with a large and square diameter. In the middle of the hole, there is a hollow and narrow tube with all air sucked out. Next to one of the walls, so close that it's touching, there is another hollow tube without air inside. Two identical...

This question was not my idea. I heard it while watching a YouTube video hosted by a celebrity astrophysicist and a comedian. This astrophysicist answers the physics questions of his Patreon supporters, and one of the supporters asked him about the spaghettification of quarks. I'm paraphrasing...

Imagine we have a cold region of the universe, almost devoid of matter and radiation. Or perhaps in a future universe where the CMB has "cooled" down to sufficiently low "temperatures" Could there be long lived macroscopic Bose-Einstein and Fermionic states of matter there? Could matter...

I have a question that I have been unable to find an answer to. The question is does matter "create" space? Some places I read that space "just is", and matter fills it and creates its gravitational curving. But that something "just is" is supremely unsatisfying as far as answers go. Another...

This may already have been answered but I can’t find it. If organic matter is disturbed, exp. on the moon, does the matter experience a gravitational pull?

R μν − 1/2g μν R= 8πG/c^4T μν In this formula, if the value of the energy momentum tensor(Tμν) becomes zero, can it become gravitational-free?

In reading Weinberg volume 1 I learned gravity is not renormalizable by Dyson power counting. This means that it has an infinite number of free parameters, and such theories lose their predictive power at energies of the common mass scale. This being said, T Hooft and Veltman showed miraculously...

I know gravity needs to be taken into account and that I can find the stiffness but generally I'm pretty lost

What is the consequence of the center of gravity passing below the rod in the high jump? Fosbury flop. Which equation is responsible for a bike being more stable the faster it's driven? and in rotating things in general being more stable the faster they're rotating.

Looking out the window on recent flights I have given some thought to the implications of the fact the bodies of water we see are never actually flat, anywhere, at any size. The earth beneath the bodies of water on its surface takes on the shape of a sphere of course, and one could say that...

If gravity is caused by the warping of spacetime - how did gravity compress the mass of the post Big Bang universe? Does said compression indicate the force of gravity exists independent of space time? Was Newtonian gravity responsible for the compression? On the other hand, if spacetime was the...

A double-slit experiment can be run and get similar results using either photons or small particles that have mass, such as molecules. Why doesn't the gravitational field of molecules in the experiment reveal which-way information to the surrounding environment, and trigger decoherence and loss...

Hello community, I am currently designing a gravity-based electricity generator and exploring the feasibility of different setups using a 500 kg mass. The core of my project is to harness the potential energy from this mass as it is lowered from a significant height. I am considering several...