Gravitational Definition and 1000 Threads

Hello all, Well, I am on my master project named 'General Relativity & Gravitational Waves'. My supervisor asked me if you can simulate gravitational waves by programming it would be a plus. But only programming language I am currently learning is python. Is it possible to simulate some kind of...

Homework Statement An asteroid of mass m = 2.6 × 10^6 kg approaches the Earth. When it is exactly 3 Earth radii away from the Earth's centre its speed relative to the Earth's centre is u = 8.7 × 10^3 m s–1. The asteroid subsequently falls down to the Earth's surface. You may assume that the...

Stumbled upon this problem lately. Maybe someone could help me clarify some subtleties I do not see? 1. Consider the propagation speed ##c## of periodic surface of gravity waves with wavelength ##\lambda## and amplitude ##a## in water of depth ##H##. Let ##\rho_{a}## and ##\rho_{w}## be the...

Hi everyone, I read in a first year textbook (K&K) that the reason why "gravitational mass is proportional to inertial mass" is a big "mystery"... Can someone please explain why this is a mystery? Thanks

Homework Statement To explain the forces at work when a marble is released from a height and then eventually comes to rest. We did this experiment where two lengths of hose pipe were taped together. The hosepipe was then bent into a semicircular shape (forming a track) and secured onto a clamp...

Hello, thanks for reading this. I need help trying to find a way to calculate the time dilation due to gravity, from a satellite 50,000km above the surface of the Earth, traveling 10,000km/h relative to a stationary observer on Earth. A signal is being sent from the satellite to the observer...

Homework Statement A thin uniform rod of mass M and length L is centered at the origin and lies along the x axis. Find the gravitational field due to the rod at all points on the x-axis in the region Picture adjunct Homework Equations My two question are: Why r is'not the difference between...

Would it be possible to capture a gravitational lens with a decent amateur scope coupled to a reasonable CCD?

Hello my name is Aaron! I am a high school senior from northeastern Kentucky designing a pneumatic system of sorts for a science competition and need some help. I will be building a device that converts gravitational potential energy, from a falling mass, into air pressure (or possibly the...

An heavy body near other body gives off gravitational waves at a higher rate than when it is away from any body. So, if there is only one body in the universe and nothing else.Will it give off the gravitational waves and it's mass will keep decreasing?

If EM waves create gravitational field "around" them (as I understand is the case) which reference frame we should use? We could imagine several observers, some moving in the same direction with EM wave with different speeds, others moving in the opposite direction. The different observers...

I understand the derivation of gravitational potential energy when an object is moved away from Earth but when I try to derive the formula for gpe by considering a test mass moving from infinity to r then I end up with a positive gravitational potential energy. Because integrating F.dr from...

So let's say we have a neutron star. A neutron star is very massive and very dense therefore it has a very strong gravitational field. But also it is rotating very fast and it really hot. This means it has more energy than if it was stationary and cold. Of course if this neutron star has more...

Hi there, to answer some people believing in astrology, I wanted to know what was the order of magnitude of the difference of the gravitational pull between famous stars & the man-made satellites... I have no knowledge in math or so I have no idea... I just thought that I would find it...

Hi, I have been reading about gravitational waves for the last few days. I saw any cylindrically or spherically symmetric body can not produce gravitational wave, can you please explain to me why ? I also need a brief explanation on why GW are actually produced. regards

Hi all. New to physics forum and glad to be here. I have been referencing the site for a while now and have finally come up with a question i haven't been able to find on here. So I guess i thank all of you who are already on here for the help. Assumptions: -Imagine an infinitely...

Light traveling transverse to a massive body (e.g. Sun) is deviated by an angle twice the amount predicted by Newtonian gravitational theory. This is predicted by GR and proven experimentally. What would be the deviation of a matter particle traveling near c transverse to a massive body...

Homework Statement I am trying to derive the formula for simple harmonic motion of a mass hanging on a spring. I understand the derivation for the situation when the mass and the spring are on an horizontal table. Then I go about deriving the same formula for the situation when a mass is...

Homework Statement Both Newton's gravitational law and Coulomb's law are inverse-square laws: The force of attraction between the sun (S) and Earth(E) has (G*m_S*m_E)/r^2, whereas the force of attraction between an electron and a proton in a hydrogen atom is (e^2)/(4*pi*epsilon_0*r^2). Derive...

Hi Guys, I'm working on the theory for a piece of gym equipment, but I am afraid my physics-capabilities are somewhat limited. In order to illustrate my question, I have made a drawing, please look at the attachment. Excuse my english as well, it is not my first language. So on the...

So, I'm attempting to programm orbit in Unity game engine. So I need equation that shows r and phi depending on time. Equation for gravitational potential is U(r)=-k/r+M^2/(2*μ*r^2). Force is -1*derivation of U(r) by r. So I get lots of stupid stuff. If anybody could help me to...

is GPE at a point the work we must do against the gravitational force to bring an object from infinity to the point? Or is it the work done by the gravitational force?

This question may sound weird but when we lift an object with a force equal to the weight of the object up to a certain height the Earth is doing negative work on the object as well. So shouldn't the net work be zero?

Hi I am in a debate with some creationists. They are claiming that the speed of light changes in strong gravitational fields and can be slower or faster. My view is there can be time dilation effects. For example light towards the centre ( a black hole ) will be red shifted, and away from...

If, when the universe was young, and you had all of today's universe worth of matter compacted into a space only a few thousand/ million light years in diameter the gravitational effect on time would be much stronger than it is today. Does this affect our calculations on how old the universe is...

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In General Relativity spacetime is described by a metric. The most common one is the Schwarzschild metric, valid at radii greater than the surface radius of a mass. If we assume constant angular position so that dθ=dø=0, then this metric relates local (proper) coordinate time and distance dτ...

Hi there! My physics is not exactly strong (I am a games developer/designer). Basically I have a game idea where the player will jump between the floor and the ceiling. At any point the player will jump and be affected by the gravitational point of the ceiling and the floor at the same...

The dozen or so suns observed orbiting the black hole at the center of the Milky Way have exhibited classical continuous elliptical orbits about the black hole. How come there is no gravitational lens distortion of the suns image observed when the suns pass behind the black hole?

1. What is the strength of the gravitational field (in N/kg) at an orbit of 1.0 x106 m above the planet Zoklopgniald with mass of 3.45 x1026 kg and mean radius of 7.80 x107m? ANS:3.69 N/kg What is the gravitational force exerted on a 2840 kg satellite orbiting Zoklopgniald at this altitude...

Or stated otherwise: Is it possible, due to other effects than mass for a non-spinning object with inertial mass n to exert a gravitational force characteristic of another non-spinning object with inertial mass different than n - theoretically or practically? I hope that covers all the caveats...

If virtual particles are constantly popping in and out of existence all around us, what gravitational effect does this have? Even if they are here for the briefest of moments they should be effected by gravity and have their own gravitational effect on other matter...shouldn't they?

This may be a stupid question, but have the various gravitational wave observatories around the world been tested by seeing if they can detect man-made gravitational waves, and thus work as expected? Or would it be too unfeasible to make them, even given the extreme sensitivity that the...

When I was in introductory physics I remember being told that the net force (gravitational for example) inside a shell is always 0. I always felt that, intuitively, this would only be true at the center of the ring. Not sure what made me think of it today, by I decided to sit down and do the...

Hello everybody! Extreme interferometers like Ligo, Virgo, Leo600, Tama300 try to detect gravitational waves http://en.wikipedia.org/wiki/Gravitational-wave_detector and ground movements are one difficulty for them. The mirrors are suspended in several stages to insulate them, sometimes...

Homework Statement A rubber band at temperature ##T## is fastened at one end to a peg and supports from its other end a weight ##W##. Assume as a simple microscopic model of the rubber band that it consists of a linked polymer chain of ##N## segments joined end to end; each segment has length...

Hello everybody. I registered today in this forum and this is my first post. I'm Italian, therefore sorry for my ugly english. Studying physics (for my personal curiosity) I proposed myself two problems I couldn't solve. One of these, is: at the point x=0 (of a one dimensional space) there...

Hello Everyone, I am new to this forum. I understood from sources that space-time is like a fabric. The massive bodies bend the space around it, hence the gravity. If time is 4rth dimension, so, the space is bent in time due to mass. that pretty much explains stopping of time in black holes as...

So the formula is F=Gm1m2/r^2. Could you substitute one of the mass values for an energy value since gravity attracts energy ? Or would this require a different equation?

Homework Statement Three identical very dense masses of 8000kg each are placed on the x axis. One mass is at x1 = -140cm , one is at the origin, and one is at x2 = 440cm . What is the magnitude of the net gravitational force Fgrav on the mass at the origin due to the other two masses? Take...

Take a hypothetical object with an infinite density (purely so that a particle can get incredibly close to it). Furthermore imagine that this object has no close range repulsive force, or in other words, particles can pass right through it. The only thing is does is exert a standard...

what is the ratio of inertial mass to gravitational mass and how we can calculate it?

I am trying to learn Physics an dI am reading a booK about classical mechanics.I a stuck somewhere in there If you know a gravitational force to a uniform rod I saw there a x and dx Why we need them ? Thanks!

This question needs to be framed: We track time at the Earth's surface using atomic clocks. We know that objects in orbit have clocks that run slower because of velocity and faster because of reduced gravity, and which effect is dominant depends on altitude as this illustration shows...

Hi all, This is Newton's universal law of gravitation: F = GMm/r2, where r is the distance between the centre of the two bodies. Therefore, considering two objects in mutual gravitational acceleration, with only linear motion and acceleration, they shall be moving in closer and closer. Since...

Hi, the following two views appear inconsistent to me: In the infinite perfectly homogeneous universe: a) the net force of gravity is zero everywhere, so no energy is being exchanged and no particle is pulled in any direction whatsoever. b) the net force of gravity within a spherical...

Homework Statement Here is the pic: http://i.imgur.com/olnuDjL.jpgHomework Equations The Attempt at a Solution So intensity was pretty easy, it came up to be y=\frac{GM}{a^{2}}(1+\frac{1}{2\sqrt{2}},1+\frac{1}{2\sqrt{2}}) Check on if it's correct would be nice aswell. Now for potential I know...

Homework Statement So in this video: https://www.youtube.com/watch?v=rm3x2X0X_Sc&t=210 Why does g.out and g.in have values as shown on the video? I can not for life of my understand it. Homework Equations The Attempt at a Solution

I was studying the equations of free fall and of launch when I realize that those equations are spetial case of a object in motion through of a gravitational field. So exist some general equation that describe the motion (the trajetory*) of the object through of the field (using initial values...

Hi, I am a bit confused with the relationship between gravitational field strength and gravitational potential. As far as I know, gravitational field strength is defined as: g=\frac{F}{m}=\frac{GM}{R^{2}} and gravitational potential is defined as: V=\frac{-GM}{R} Now if I...