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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
How can gravity cause movement of earth materials?
Because most of the earth's surface is not perfectly flat.Some places are high
er, and some places are lower.Gravity is aways pulling things from high places down to low places.This downhill movement of earth's material caused by gravity is called mass wasting.Mass wasting depends largely on how steep a slope is.
What is the gravity of the Sun balanced by?
The gravity of the Sun is balanced by the outward pressure from nuclear fusion occurring in its core. This pressure pushes outward, counteracting the force of gravity pulling everything towards the Sun's center, maintaining the Sun's stable size and shape.
Which object in our solour system has the biggest gravitational pull and why?
In our solar system it would be the sun. But there are much more massive objects beyond our solar sytem that would have a higher pull - the more massive an object is the higher its gravitational pull. a black hole has a huge gravitational pull, so strong that light cannot escape.
How blood flow against gravity?
For the same reason that you're able to get water through the faucet
on the 2nd or 3rd floor of your house. The pressure of the fluid at the
bottom is great enough to lift the fluid against gravity.
Your heart provides the functionality of a "pump", maintaining pressure
in the flow of blood sufficient to cause it to flow down, up, and sideways,
through the widest arteries and the smallest capillaries, no matter what
physical position you happen to be in. Highly trained experts in the field
of medicine refer to that specific physical parameter as "blood pressure".
Your body muscles exert forces when you liftpushrunjump and so forth Are these forces conservative?
if we are talking about just forces, yes they are conservative since they don't change the total mechanical energy of an object. if it is about the system in which our bodies are involved, they are not since they produce some heat. however the way the problem asked is refering to first explanation because it is asked the forces our bodies exert.
What three factors affect the pull of gravity?
Factor #1: The mass of the first body involved.
Factor #2: The mass of the second body involved.
Factor #3: The distance between the centers of mass of the two bodies involved.
What phobia is the fear of gravity?
Barophobia is the name of the phobia relating to the fear of gravity If we all had this fear we would be scared all of the time because the earth has gravity so we would be around it all of the time
What is the center of gravity of the elderly person?
The center of gravity for adults is the hips. However, as the person grows older, a stooped posture is common because of the changes from osteoporosis and normal bone degeneration, and the knees, hips, and elbows flex. This stooped posture results in the upper torso being the center of gravity for the elderly person.
Where is the giraffes center of gravity?
The centre of gravity for a giraffe is almost in the middle of it's stomach but closer to the front. That is why the giraffe can slide down and not tip over.
air resistance is everything, if both were dropped at the same time from the same height in a vacuum, they would accelerate equally, hitting the floor at the same time.
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acceleration (a) is given by:
a = force / mass
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force (down) is given by mass (kg) * acceleration due to gravity
regardless of the mass, the acceleration in a vacuum would be the same.
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Once air is introduced however, any motion would be resisted by the air, according to the equation: force (up) = (velocity squared * drag coefficient)
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so, net force available for acceleration once in motion, at a given velocity = force (down) - force (up)
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if you assume same drag coefficient for both, at any given velocity, lighter object will have less acceleration, leading to heavier object hitting the floor first
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notes:
terminal velocity is where force down = force up
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for same drag coefficient, more massive object will have greater terminal velocity.
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guess at drag coefficient for book / paper = 0.005
Was gravity invented before the flood or after?
gravity wasn't invented, it was discovered by isaac newton
Also, it must have been there during the flood, otherwise
that water would not have stayed on the ground.
Can humans create artificial gravity?
We can create conditions that 'mimic' gravity, and provide the familiar 'downward' force
that we need in order to remain oriented and feel normal. But it's not gravity.
Can weight loss change your appearance?
Actually when your weight looses, the face sometimes change completely. Your extra skin and fat which cover your face before now start dying and you feel more glow in your face.
What is the wisdom of Allah creating gravity?
when there is gravity, all the creation of Allah are able to follow their norm. for example, human can do their work to earn living and worship Allah.
gravity also shows the greatness of Allah when everything has the same gravitational force that is 9.8 m/s2 no matter where the object s on Earth. hence, human will bow down and be grateful to Allah.
A character in physics is usually used for many different things in many different areas of physics, and indeed science. They are only really useful to convey information if people first agree on its meaning. Usually it is quite clear however if a particular use is quite common in the field you might be working in.
As an example, g might represent the gravitational acceleration on a planet in mechanics or something like the coupling strength of a gauge force in quantum field theory.
The coaster has more gravitational potential energy at the top than it has at the
bottom. The difference is
M G (h2 - h1) = (96.6) x (9.8) x (the distance between the top of the hill and the bottom of the hill)
If that "72m" is actually the distance between the top and the bottom of the hill,
then the coaster has 68,210 joules more PE at the top than it has at the bottom.
If it doesn't lose any of it to friction on the way down, then that entire juicy 68,210 J
is available to be turned into kinetic energy on the way down. How fast could it be
going when it gets to the bottom of the hill ?
KE = 1/2 M V2 = 68,210
1/2 M = 48.3 kg
Divide each side of the KE equation by 48.3 :
V2 = 1,412.2 (m/s)2
V = 37.58 meters/second
That's 84 miles per hour !
Note:
You didn't say anything about the mass of the people in the coaster car,
or even whether there's anybody in it. If there are riders in the car, then
their mass naturally adds to the mass of the car. The chain has to do more
work to drag it up the hill, it has more gravitational PE when it gets there,
and it's moving faster when it returns to the bottom.
Where do you report scientific discoveries?
If you made a scientific discovery you generally write a paper for a peer-reviewed magazine (such as Nature) and submit it. If it is good enough it will appear in some future issue.
If your discovery was made as part of your work in a company it is also possible that they want to patent it, or have certain restrictions on papers you write in order to profit from the discovery first themselves.
If you made the discovery yourself you can also patent it yourself.
Is gravity important?
Indisputably, the creator of the affect we call change that is due to the interaction between the stars and other matter creating another mater called space consisting mainly of photons (states of energy, energized particles that emit from matter/that can also create it) in transit they are undetectable by man or machine unless focused upon as a transmitter and receiver does using large amounts of energy.
Gravity is like the truth its creation enables evolution ~ violating Newton's action causes equal and opposite reaction law. Without resistance governing our minds perpetual understanding would be shared and war would suffer at the source the only tax that would be allowed would be a judgment against its political instigators ~ a spiritual tax for breathing deception into our world of retrospection: knowing, every future has a past just follow the course of expenditures for natural disasters to realize the gravity of their nature… consumes our lifetime by conversion of our investment of real time into a state of no deposit or return into the account of its creation. Gravity is never destroyed but it can be employed with consequence enjoyed by the advantage taken by the greed without a need in-just-ice: falling are the felons of this nations indigestion.
When do you feel lighter or heavier on a roller coaster?
-- You feel lighter on a roller coaster when your speed is either
upward and decreasing or downward and increasing.
-- You feel heavier when your speed is either upward and increasing
or downward and decreasing.
-- Exactly the same as on an elevator.
Is there a river that flows against gravity?
Usually, there are only small portions of a river that flows against the slope of the land , or gravity. I work at a park on the White River in Hamilton County IN. We are in a huge bend in the river and the White River flows northward at this point, against the slope for about a 1/4 of a mile. This happens on the St. Joseph River in northern Indiana and a co-worker tells me the Cuyahoga in Ohio also has this phenomena. I reckon it is an uncommon, but not rare, situation.
What factors influence gravitational force of attraction?
-- The masses of the two objects being drawn together by mutual gravitational forces.
-- The distance between the centers of the two objects.
This is a complete list. These are the only factors that influence the strength of
the gravitational force between them.
How the massive bodies can exert gravitational force?
We are always asked questions about one body exerting gravitational force,
and we must emphasize again: That's the least helpful way to think about it.
Gravitational force always involves two bodies. The strength of the force depends
on the mass of both bodies, the force acts along the line between the centers of
both bodies, and both bodies feel gravitational forces with the same strength.
Whatever force the earth 'exerts' on you that draws you toward it, you exert the
same force on the earth that draws the earth toward you.
The water present in the watermelon will give the fruit moisture and will not allow the heat to react with it.
What is the name of the scientist who studied gravity?
* Kanada in 8 BCE discovered that weight, a property of mass causes falling. * Aristotle, in 4 BCE discovered the center of gravity, and that things fall from their center towards the center of the Earth, in proportion to their weight. * Brahmasphuta Siddhanta (628 CE) foretold that by nature what goes up must come down. * Muhammad ibn Musa (~1000 CE) hypothesized a force of attraction between heavenly bodies. * Al-Khazini, (1121) differentiated force, mass and weight as separate properties. * Galileo Galilei (~1600) realized that bodies accelerated downwards at the same rate, regardless of mass. * Sir Isaac Newton published Principia in 1687 wherein he expressed his law of universal gravitation, that the same force that plopped an apple upon his head keeps the Moon in orbit of the Earth, and the Earth and planets in orbit around the Sun. He also defined the inverse square law, where gravity between two objects affects them in direct proportion to the sum of their masses, and inversely proportional to the square of the distance between their centers of mass. * Einsteinformulated General Relativity by which nothing, including the effect of a force such as gravity, moves faster than the speed of light, hence we are affected at any given moment by the celestial bodies where we see them, rather than where they actually are.
* Satyendra Nath Bose hypothesized particles now called gravitons, a type of boson that create the exchange of force we perceive as gravity. In string theory, gravitons are unattached closed loops, which accounts for its weakness in comparison to the other three mechanical forces; they are not fixed to this universe, hence affect neighboring manifolds as well.
