Attraction Definition and 305 Threads

Since we can observe gravitational lensing and conclude that mass can affect the path of EM radiation it seems logical to me to assume that EM radiation will exert a slight gravitational attraction of it's own on a mass,- although I do not recall ever reading about this. Presumably the...

I would like to study a pendulum in 2D, not on Earth but only with one fixed mass attract a disk. Considered this fixed mass like a point. No friction on this theoretical study. The disk can move only around a part of circle. There are only 2 forces, F the attraction and N the force from wall...

Can anyone help me understand why two coaxial solenoids separated by a distance x, with current flowing in the same direction in each solenoid, would be attracted to each other using the right hand rule? Im sure they would be attracted to one another (with the current flowing in the same...

Since Colour Force is Strong Interaction, is there a equation to calculate Strong Interaction or express it mathematically? The closest I came to is the Coupling Constant but it doesn't provide a equation for Colour Force. I was also looking at the Gluon Field Strength Tensor, is this related...

I have been asked to calculate the attraction between two solenoids that are positioned in 'series' N-S N-S and have a space 'x' between them. I tried to approximate the attraction between them by using the equation for attraction between cylinderical bar magnets: F=\left[\frac {B_0^2...

Problem: What is the electric force of attraction between charges of 3 C and -10 C separated by a distance of 5 m? Equation: F= k x (Q x q / r^2) 3 x -10 / 5^2 = -1.2 x 8.99E9 = 1.08 E10 N. Using this equation and the answer I found, I still am getting the wrong answer. Not sure what...

Homework Statement The force of attraction between Mars and its moon, Phobos, which has a mass of 1.072 x 10^16kg and a radius of 11.1km is 5,18 x 10^15 N Find the height of Phobos above the surface of the moon. Homework Equations f=G(m1)(m2)/d^2 d(mars-phobos surfaces)= d (moon-phobos...

Homework Statement Find the magnitude and direction of the force on the charge -Q on the figure in the attached document. Homework Equations F = k(q)(Q)/r2r-hat The Attempt at a Solution So I have a force in the x direction and a force in the y direction. Fx = k(Q1)(-Q)/(a)...

Hello everybody, This is my first post and without bragging and sounding like a show off i thought i would give a short introduction, i am not an incredibly intellectual individual, i have a minor understanding in the universe and physics, i do not and have never studied at any...

what would happen if a small magnet was exactly placed by the middle of another larger magnet in a direction parallel to it and at a considerable distance ? will it be pulled to the south pole or to the north pole ? or will it be pulled down the middle such that the north pole of the smaller...

Hi, I have carried out an experiment to investigate the force of attraction between two bar magnets by changing the separation between the two magnets. Both bar magnets are about 4cm long and I have recorded results between 1cm and 10cm's. A lot of the research I have carried out appears...

The concentration of flux in low-reluctance materials forms strong temporary poles and causes mechanical forces that tend to move the materials towards regions of higher flux so it is always an attractive force(pull). what are these mechanical forces... are they result of torque produced...

There is an attraction between every two objects,the strength of the the attraction is directly proportional with the masses of the to objects and indirectly proportional with the distance between the two objects squared, so where this is square came from, why not only distance. :rolleyes:

Hello! There is an interesting effect that I've discovered in magnets while studying E&M and experimenting. If the surface area where the magnet will be attracted to,for example the surface area of the steel plate is x4 times larger than the magnet, then there would be a stronger attraction...

In physics lab we positively charged a metal sphere then placed a compass near it and both ends of the compass were attracted to the sphere. I know magnetic fields are created by electrons, so I made the assumption the compass is attracted to the positive charge because the electrons in the...

When a (say 50 meters) asteroid 'A' strikes a larger (say 500 meters) ‘equally hard’ asteroid 'B' at a small angle to the asteroid 'B' would have two vectors, one large vector parallel to the asteroid 'B', another second small vector perpendicular to the asteroid 'B'. ...

I don't understand why the answer is B It make sense if the question is asking which one is the incorrect force since my diagram contain all the arrows except B..

Scientists want to place a 2900.0 kg satellite in orbit around Mars. They plan to have the satellite orbit a distance equal to 1.6 times the radius of Mars above the surface of the planet. Here is some information that will help solve this problem: mmars = 6.4191 x 10^23 kg rmars =...

Homework Statement 12. You are given a large collection of identical heavy balls and lightweight rods. When two balls are placed at the ends of one rod and interact through their mutual gravitational attraction (as is shown on the left), the compressive force in the rod is F. Next, three...

Homework Statement From this video: http://www.youtube.com/watch?feature=player_detailpage&v=mdZo_keUoEs#t=77s it shows that the steel rod will eventually stay in the middle of the solenoid. At first the magnetic field of the solenoid would look like...

So if any subtance has theoretically 0 degrees kelvin, it will be a solid, correct? So does that mean that temperature is the main factor that determines state of matter? What i mean to ask is, why would non polar molecules want to be close together like in a solid, when really, the electrons in...

Hello, comparing the formula of gravitational attraction with F = m*a you get that the smaller mass disappear. I don't think this is physically correct, do you ? thank you

Should you be fired for being a, “irresistible attraction”? http://minnesota.cbslocal.com/2012/12/21/iowa-court-bosses-can-fire-irresistible-workers/ It seems a strange reason to fire someone even if it's legal. People have been fired at Hooters for being unattractive but they know the...

Homework Statement two point masses (400 kg) are 10^14 m apart in deep space under no gravitational attraction besides each others. find their velocity when they are 1000 m apart.Homework Equations -G (m_1m_2)/r^2=F The Attempt at a Solution I integrated the equation above plugging in the 400...

Sorry if this is the wrong place to post this but I wasn't quite sure where to put it. My question is, what makes thing attract? What actually causes particles to attract to each other? I know someone is going to give me the break down of field theory here but that's not what I'm after. What...

Hi, I have read about electric charge and tried to understand one particular thing but still couldnt: If we positively charge a big metal plate with very high voltage and approach to it a small solid neutral metal sphere, the smaller sphere obviously will get attracted, i.e. a force will...

I know that the electron has an electric charge of 1.6x10^-19C and a magnetic moment of 9.3x10-24J/T. If you placed two electrons 1 angstrom apart in such a way as their north poles are pointing at each other, the coulomb force would attract them and the magnetic force would repel them. Which...

Homework Statement Gerald stands on the roof looking up at the full moon, which has a mass of 7.39 x 10^22 kg. At this moment, Gerald is 3.77 x 10^8 m from the center of the moon. If the mass of the Earth is 5.96 x 10^24 kg, and the radius of the Earth is 6.39 x 10^6 m, what is the ratio of...

Homework Statement A solid led sphere of radius 10m has a mass of about 57 million kg. If two of these spheres are floating in deep space with their centers 20m apart, the gravitational attraction between them is only 540N. How large would this gravitational force be if the distance between...

I learned the formulas F = G \frac{m_1 m_2}{r^2} and F = m \cdot a and also saw mathematically that objects have the same gravitational acceleration and will fall down at the same rate, also demonstrated in a video by people that were on our moon, even though one object clearly has more force...

Find the gravitational attraction of a solid hemisphere of radius a anddensity1 on a unit point mass placed at its pole. My attempt: Obviously I figured that spherical coordinates would work nicely for this problem. I decided to invert the hemisphere thus placing the pole on the origin...

I can't remember what the experiment is called, but it was to test for virtual anti-pair particles, and two plates where put together so close that at certain energies of virtual pairs should be excluded, thus creating a difference of pressure as to push the plates closer together. But when you...

Homework Statement Two bags of apples, each containing 20 apples of equal mass, experience a gravitational force of attraction of 200 units when separated by a distance of 25.0cm. If 10apples are removed from one bag and placed into the other bag, and the two bags are separated by the same...

Homework Statement Michael has a mass of 75.0 kg and Elaine has a mass of 55.0 kg. If Michael and Elaine are 2.50 m apart from each other as they sit in their Physics class, determine the gravitational force of attraction between them. Homework Equations I have made a list of equations...

DC motor rotor + stator : torque by attraction ? [Solved] So on that image there's a very simple dc motor. Knowing that F = B*I, the force acting on the wire can be represented as on the image. Also the current passing through the rotor will create a magnetic field, represented by Brotor...

attraction -- why do electrons and protons attract each other? Hi, why does electrons and protons attract each others? This happen with other particles too (photons, neutrino etc..) ? thanks

Hi All, I was wondering: for a given size and strength magnet sticking to a wall of a given material and surface area, does the thickness of the wall affect the strength of the attraction? What are the governing equations at play? I am trying to gain insight as to why or why not the...

I would like to know where is the force that prevent the system to turn around. I use balls which are attrack with springs, the force of the spring is like 1/d or 1/d² like gravity for example. I see the force FR in the system, like the circle can only put a force in the center C I don't see the...

You may have noticed that the materials that make good magnets are the same as the materials magnets attract. This is because magnets attract materials that have unpaired electrons that spin in the same direction. In other words, the quality that turns a metal into a magnet also attracts the...

I would like to better understand the nature of gravitational attraction and the law of conservation of energy. Imagine you measure inertial mass (using inertial ballance) of an object far from a gravitating mass which is at rest relative to the object. Then you release the object and let it...

Hi, I'm an undergraduate biologist student. I was studying chemical bond, but, while trying to understand it, I couldn't really get what causes the electric charges, what seems essential to me. So, someone can explains, in the simplest way as possible, what is electric charge? What causes it...

Homework Statement i need to find the work of gravitational attraction based on heights of balls being shot into the air. the mass of the ball is 24 grams, the height is 27cm at 0 degrees, 38 at 30 degrees, 50 at 45 degrees, 61 at 60 degrees, 80 at 90 degrees. i also need to find the initial...

This is going to be quite hard to phrase but here goes. Is there a formula/equation to find the acceleration of two of the same-charge particles, away from each other, taking into account field intensity and mass? And the same question for attraction between two oppositely charged...

https://www.youtube.com/watch?v=qHrBhgwq__Q&feature=player_detailpage Don Pettit, unfortunately, narrates, but doesn't explain much. The main needle is Teflon and the other needle by the injection of the water droplets (seen near the end of the vid) is Nylon. The site asks about the choice of...

Hi, I have two questions that come from a unique example of magnetism. Here is the scenario: a thin and long piece of iron is placed in between a magnet and the north pole faces the outing sheet and some iron tacks. The iron tack do not get attracted to the iron even though a south pole is...

-You get two pieces of dry glass material with perfectly flat faces. -You press and rub them together. Initially, they seem to glide smoothly against each other... -...Eventually, after a few strokes, friction force gets very strong until the point you can't rub them at all. -A this stage...

Homework Statement I attached the problem. Homework Equations F=G*m1*m2 / r^2 The Attempt at a Solution Fs=mutual attraction force between particle and sun Fe=mutual attraction force between particle and earth mass of sun(ms)=330,000*mass of earth(me) mp(mass of particle) x=distance between...

Repulsion's got a nice, 'this emits that, hits this; see Newton's third Law' explanation. Attraction. I found one thing. It says this: A virtual particle with momentum p corresponds to a plane wave filling all of space, with no definite position at all. It doesn't matter which way the...

I was wondering about a scenario where we have a unit mass M1 and a thin rod of mass M2 of length L with a distance r between them attracting each other . Is my following approach to the problem correct ??! let s = r + L I know that F= -(GM1M2)/(s^2) where G is gravitation constant therefore...

What is the physical difference between static and magnetic attraction?