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Gravity
One of the four fundamental interactions, gravity is responsible for the fact that any objects with mass attract one another. According to general relativity, it is a space time curvature, but according to quantum mechanics it is the result of exchanges of virtual gravitons.
4,784 Questions
What are what are two stars orbiting a common center of gravity?
A Binary star system
A system of stars orbiting a common center of gravity where there is no mass at the center of gravity is known as a Kepler Rosette. Such an arrangement is theoretically possible but is unstable. No such an arrangement has (yet) been observed in the real universe.
All objects in a Kepler Rosette have to have identical mass and exactly the same kind of orbit (differing only in their phase angle) and must be evenly spaced on some multiple value of their phase angle. If the orbit of such a Rosette is eccentric then the system will pulsate in diameter on the period of the orbit.
Does the moon have gravity on it?
Gravity exists throughout the universe and at every point in it.
Because of the existence of gravity everywhere, there is a pair of forces
that attracts every pair of masses toward each other.
What was Galileo contribution to your onderstanding of gravity?
He said that the time for free fall does not depend on the mass of the object.
A2. He was a supporter of the Copernican view that the Solar system was Helio centric, as opposed to Terra centric. The Catholic church of the time considered this a heresy and forced him to recant. Nevertherless, he continued to support Copernicus, and published papers in that view. For which the Church never forgave him and he was under house arrest for the remainder of his life.
How can zero gravity be achieved?
Zero gravity can be achieved in space by being far enough away from any large gravitational bodies, such as Earth. It can also be simulated on Earth for short durations in specialized aircraft that perform parabolic flights, creating periods of weightlessness. Additionally, some facilities use drop towers or water tanks to create brief moments of apparent weightlessness.
How does gravity affect the launch of spacecraft from earth?
Gravity affects the launch of spacecraft from Earth by pulling the spacecraft back towards Earth. The spacecraft must overcome this gravitational force through its propulsion system to successfully launch and enter into orbit. A balance between the force of gravity and the propulsion system is required for a successful launch.
What happens when a balloon filled with helium goes into space?
In space, the helium inside the balloon will expand due to the absence of atmospheric pressure. Eventually, the balloon will burst when the pressure inside it becomes greater than the tensile strength of the balloon material.
Can a person cry at zero gravity?
Yes, in zero gravity, tears do not fall in the usual way but form as bubbles around the eyes. So while tear formation and release are physically possible, the tears will not stream down the face like they do on Earth.
Who proved the existence of gravity?
Sir Isaac Newton is credited with proving the existence of gravity through his theory of universal gravitation published in the Principia Mathematica in 1687. This theory explained how objects with mass attract each other through gravitational force, based on the law of universal gravitation.
Do only planets exert gravity?
No. Anything with mass exerts a gravitational pull. The strength of that pull is directly proportional to an object's mass and most objects do not have enough mass of their gravity to be noticeable. It starts to become noticeable with objects on the level of large asteroids and comets and small moons. Stars, which are far more massive than planets, have far stronger gravity. Black holes have the strongest gravity in the universe.
Does the earth have more gravity then the sun?
The Sun and Earth exert equal but opposite forces on each other, obeying Newton's third law. However, if you're referring to another object being pulled by just the Sun or just the Earth, then it depends on the distance from them. If the distance in both situations are equal then the Sun pulls with a greater force due to having a larger mass.
What does mass and weight have to do with the law of gravity?
The mass of an object determines the strength of its gravitational pull, as described by Newton's law of universal gravitation. Weight, on the other hand, is the force of gravity acting on an object's mass. The greater the mass of an object, the greater the force of gravity pulling it towards another object with mass.
What day of the year does the earth have the least gravity?
As long as the Earth's mass doesn't change, neither does
its gravity, regardless of what day it is.
How does gravity affect the galaxy?
Gravity plays a crucial role in galaxy formation and evolution. It acts as the force that pulls gas and dust together to form stars and holds together the structures of galaxies. Gravity also influences the motion of stars and other celestial bodies within a galaxy, shaping its overall structure and dynamics.
Does Mercury have stronger or weaker gravity than Earth?
There less gravity on Mercury than on Earth.
Were else is gravity but earth?
Gravity is present throughout the universe, affecting all objects that have mass. It is a force that exists between all objects with mass, so gravity is not limited to Earth but can be found everywhere in space. Gravity keeps planets in orbit around stars, holds galaxies together, and influences the motion of all objects with mass.
How do you find gravitational acceleration?
One elegant way to measure the acceleration of gravity at the place where you are
is to measure it with a swinging pendulum. You must be able to measure the length
of the pendulum, and the time of its swings, very accurately, and you must enclose it
in some sort of a can or a box in order to keep air currents away from it.
When you've measured its length ( ' l ' ) and the time of its swing ( ' T ' ), the acceleration
of gravity ( ' g ' ) is
g = T2/(4π2l)Does the sun exerts gravity on other planets but does not exert gravity on earth?
No, the sun exerts gravitational force on all objects in the solar system, including planets and Earth. This force keeps the planets in orbit around the sun and also affects Earth's orbit and tides due to its gravitational pull.
Why is Isaasc newton discovery gravity important?
Isaac Newton did not discover gravity. Practically everybody already knew that
when you let go of something in your hand, it falls to the ground, and nobody
paid any attention to the few who didn't know it. What Isaac Newton did was
explain exactly how it works, with numbers. With that simple new knowledge,
it was possible to explain how and why the moon revolves around the Earth,
how the planets and comets revolve around the sun, and how to launch spacecraft
that can carry people to the moon, land cameras on Mars, sail probes out of the
solar system, and hang satellites up in the sky that can bring you 900 TV channels
that have nothing on.
Of course, if none of that is useful or interesting to you, then Newton's discovery
wasn't important.
What are 2 planets with a stronger gravitational pull than earth?
Jupiter and Saturn have stronger gravitational pulls than Earth due to their greater mass. This stronger gravity is responsible for their larger sizes and higher densities compared to Earth.
Will earths gravity act on different sized apples in the same way?
Every day, you see gravity acting on different sized people in the same way,
so it shouldn't be too hard to accept that apples have the same experience.
What is the ratio gravity of mercury?
The acceleration due to gravity on the surface of Mercury is about 3.7 m/s^2. This means that Mercury's gravity is approximately 0.38 times that of Earth's gravity, which is about 9.8 m/s^2.
Is there anywhere on earth without gravity?
Gravity is everywhere in the universe. There's no getting away from it, anywhere.
Who is the British scientist that discovered gravity?
Gravity was discovered not by a British scientist, but by the first living thing
that had a brain and fell down.
Sir Isaac Newton was the British genius thinker who captured the entire nature
and behavior of gravity in the formula
F = G M1M2/R2
What is the amount of gravity between an object and a planet?
The force of gravity between any two objects is
G x (mass of one object) x (mass of the other one)/(distance between them)2 If the masses and distance are in SI (metric) units, then G is 6.67 x 10-11 ,
and the force is in newtons. (about 4.45 newtons makes 1 pound.)
It doesn't make any different whether the two objects are a planet and an ant, a
planet and a star, two ping-pong balls, two people, or a galaxy and a feather.
That's the amount of gravitational force that's trying to pull them together.
Why doesn't Dark Energy effect things on a smaller scale then galaxies?
We don't know.
"Dark energy" and "dark matter" are more-or-less euphemisms for "we have no idea what the heck is going on here."
In the case of dark matter, the "here" has to do with the rotation of galaxies. If Newton's Law of Universal Gravitation is even approximately correct on a galactic scale, then galaxies don't rotate properly. We can fix this problem in one of two ways: we can assume there's a lot of mass that's hidden from us and only interacts via gravity (and, possibly, via the weak force, which turns out to only act over such tiny distances that we can completely ignore it for something the size of a galaxy ... or for that matter, the size of a grain of sand), or we can assume Newton's equations are just the small-scale limit, and that a different law applies for objects the size of galaxies. Both approaches have been tried; both are consistent with observed data, but neither has been absolutely proven correct.
In the case of dark energy, "here" has to do with the cosmological constant. When Einstein was attempting to work out his equations about how the universe behaves, he found it necessary to add an arbitrary parameter in order to get the equation to agree with observations. Actually, the model would have been consistent with what was then known about the universe if you assumed it was expanding. Einstein didn't like that for philosophical reasons, and put in the constant.
We now know the universe is expanding, whether we like it or not, but we also know more about how it's expanding, and it turns out that having a non-zero value for the cosmological constant makes the model work better. Scientists don't like inserting random parameters into equations without at least trying to explain where they come from, and "dark energy" is one attempt to explain the fact that the cosmological constant does not appear to be zero.
The reason it "doesn't affect things on a smaller scale than galaxies" ... according to theory, it does. It's just such a very, very tiny effect that on the small scale ... and by "small scale", I mean anything not mind-bogglingly huge, not just galaxy-sized or ever galaxy cluster sized but more like "the spacing between superclusters" sized ... then the effects are utterly indetectable against the background of gravity and electromagnetic forces.
Answer2:
Dark Energy does effect things smaller than galaxies!
Dark Energy effects things on every scale from Cosmos to atom. Dark Energy is involved in every spec of mass that moves, it is the product of Momentum and the speed of light, cP. Momentum is everywhere from the neutrino to the galaxies. Momentum energy, Dark Energy is everywhere there is Momentum.
Einstein's original conception was working on a stationary cosmos involving galaxies.. His mathematics did not show the stationary condition, so he added the Cosmological Constant. This was the correct idea. Einstein was looking for a centrifugal force to counter the centripetal force of gravity. Others assumed the equations were correct and the cosmos was dynamic either expanding OR contracting. The Big bang Theory and The red shift data was combined to conclude that the cosmos is expanding.
The more correct theory i call Quaternion Physics. The cosmos is not expanding and the Dark Energy is the source of the centrifugal force to bring about Stationary. The Dark Energy is the Momentum Energy, cP where P =mV, the Momentum vector. The Momentum is everywhere large and small sizes. The Dark Energy cP is also everywhere and large an small. It can be seen that Dark Energy cP = mvc is larger than "regular' energy mvv.
The centrifugal force comes from the Divergence of the vector energy
DEL.cP = -cp/r cos(P). The centripetal force is vp/r = mv2/r, the balance of these two forces give the Continuity Condition and the derivation of the red shift;
vp/r=cp/r cos(P) gives v/c = cos(P) the source of the red shift.
Thus the red shift is everywhere orbits are stable and indicate the Continuity Condition (the scalar forces summing to zero) and the Fermion Condition.
The Quaternion Physics answers the observations without ghost energy and matter. The Gravitational Energy is W= -mGm/r + cmV= -vh'/r + cP where the scalar/Boson energy is -mGM/r = -vh'/r and the vector/Fermion energy is cmV=cP the Momentum energy is the so-called "Dark Energy", Dark Energy is everywhere from the atom to the Cosmos; e.g. W = -vh'/r + cP where the electrons and Photons have the Momentum energy, cP.
*h'=h/2pi.
