What is gravity?

Question

Does gravity affect speed of light? - from - 29 answer(s)
What is the fuction of gravity?does all the objects react to gravity... - from - 6 answer(s)
Why does gravity exists?????????? - from - 21 answer(s)
What is the fuction of gravity?does all the objects react to gravity... - from - 5 answer(s)
What does petrol's specific gravity have to do with mileage and performance

Answer 1

Use the Octane Level You Need.
Petrol having different octane number does have different specific gravity.Higher octane number petrol have more effiency in combustion as it minimise the knocking in the cycle which is a wasteful of energy.
Your owner's manual recommends the most effective octane level for your car. For most cars, the recommended gasoline is regular octane. In most cases, using a higher octane petrol than the manufacturer recommends offers no benefit. Unless your engine is knocking, buying higher octane gasoline is a waste of money.

Answer 2

I don't understand you. If you have had so many answers from so many sources why ask again?

Specific gravity has nothing to do with the earth's gravitational pull. One is the density (liquid) and the other is the force.(earth's).

Gasoline's acceptable performance is compared against, pure water as the standard. Water's Sp.gravity is 1. Gasoline is about 0.78. Anything less or more means there is a contamination purposefully or otherwise. Government authorities periodically check the gasoline for its marketability.

Lower the Sp.gr. means internal combustion engines do not burn them efficiently. Higher also means the same. That results in wasted gasoline, meaning lower mileage.

Hope this helps you to understand the importance of specific gravity of certain liquids.

Answer 3

Personally, from science. Gravity would NOT affect the speed of light in the way you mentioned but is possible to counteract the effect of gravity with another vibration or energy.

Gravity is related to strength of magnetism (think of how magnets connect together). Some planets have a stronger gravity pull then others. Like Jupiter compared to earth's.

However, interestly between Jupiter and earth we don't know much about Jupiter compared to the sun, but internally the powerful mass of energy within is different. Like magnetism which is energy in general, creates an attraction to itself. II bet the sun itself will have some attraction thus the planets remain in orbit.

See the source link about gravity from that point of view and the same for anti-gravity.

Answer 4

1. Gravity is the fabric of space time being warped by mass through gravitons. Gravitons are theoretical particles that carry the G force. 2. No. Light speed stays the same under all conditions. It's just the frequency that's affected. Red shifted. 3. Yes. 4. They don't know why anything exists. It's just the weakest of the four known forces. 5. The function is to cause stars and planets to form. 6. Don't know.

Answer 5

Gravity

Gravity is the force of attraction exerted by a body on another entity[body]

Everything in the universe is currently experiencing a gravitational pull..it is in existence due to the presence of matter

Every matter has the quality of attracting other matter and this increases with an increase in size

For earth..this force is quite big...but it is still bigger for the sun and other stars of the universe..that is why planets revolve around them


Does gravity affect speed of light?

Yes it does
For escaping gravity..we need to acquire a certain velocity
on earth this velocity is very small...just a few thousand metres per second [quite high for us humans]....so light that has a velocity of crores of metres per second can easily escape the gravity of earth
However dense black holes have a huge force of gravity and to escape it even for light it is impossible
that is because the escape velocity required is even greater than velocity of light!


Why does gravity exists???

Gravity exists because bodies are made of infinite number of atoms that exert an electric field due to the charge on their nuclear and extra nuclear particles
When a particle comes into this field..it is attracted because even it has charged particles that are attracted by the charged particles of the other body..go it?
So when I stand near you..you will also exert a force of gravity on me...but this force being smaller than that exerted by earth on me..I don't feel it!



What is the fuction of gravity?does all the objects react to gravity

Yes all objects are affected by gravity
Gravity plays a vital role by keeping us and all other things on the ground..it would b e impossible for us to control these things if it were not for gravity!
Secondly...It balances the universe by keeping all the heavenly bodies in their place and in their orbits
So that the universe can function properly

these are but examples of the role of gravity..it has much greater applications which you will discover as you study physics



What does petrol's specific gravity have to do with mileage and performance

Specific gravity is another name for density
The denser a liquid is..the more difficult it becomes for it to flow..this is because of intermolecular attraction
Take honey and water
Honey has high density so it flows slowly
while water that has low density flows faster

If your engine fuel flows faster..you get a better,undisrupted power supply that helps your engine to function efficiently
This increases your mileage and also reduces unnecessary consumption

Answer 6

Every planetary body, including the Earth, is surrounded by its own gravitational field, which exerts an attractive force on any object. This field is proportional to the body's mass and varies inversely with the square of distance from the body. The gravitational field is numerically equal to the acceleration of objects under its influence, and its value at the Earth's surface, denoted g, is approximately 9.8 m/s². This means that, ignoring air resistance, an object falling freely near the earth's surface increases in speed by 9.807 m/s (around 32 ft/s or 22 mph) for each second of its descent. Thus, an object starting from rest will attain a speed of 9.807 m/s (32.17 ft/s) after one second, 19.614 m/s (64.34 ft/s) after two seconds, and so on. According to Newton's 3rd Law, the Earth itself experiences an equal and opposite force to that acting on the falling object, meaning that the Earth also accelerates towards the object. However, because the mass of the Earth is huge, the measurable acceleration of the Earth by this same force is negligible, when measured relative to the system's center of mass.

Answer 7

The attraction between two masses, such as the Earth and an object on its surface. Commonly referred to as the acceleration of gravity. Changes in the gravity field can be used to infer information about the structure of the Earth's lithosphere and upper mantle. Interpretations of changes in the gravity field are generally applied to gravity values corrected for extraneous effects.

Answer 8

Gravity is the other common force. Newton was the first person to study it seriously, and he came up with the law of universal gravitation:

Each particle of matter attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
The standard formula for gravity is:

Gravitational force = (G * m1 * m2) / (d2)
where G is the gravitational constant, m1 and m2 are the masses of the two objects for which you are calculating the force, and d is the distance between the centers of gravity of the two masses.

G has the value of 6.67 x 10E-8 dyne * cm2/gm2. That means that if you put two 1-gram objects 1 centimeter apart from one another, they will attract each other with the force of 6.67 x 10E-8 dyne. A dyne is equal to about 0.001 gram weight, meaning that if you have a dyne of force available, it can lift 0.001 grams in Earth's gravitational field. So 6.67 x 10E-8 dyne is a miniscule force. When you deal with massive bodies like the Earth, however, which has a mass of 6E+24 kilograms, it adds up to a rather powerful force. It is also interesting to think about the fact that every atom attracts every other atom in the universe in some small way!

Answer 9

Gravity affects everything. Even light. The gravity at the event horizon of a black hole is so immense that light can't escape its grasp.

I don't think gravity has a function per se. It just happens to be a useful thing for us on earth. But its not like gravity was invented or evolved based on a need.

Answer 10

Gravity: Force of attraction that exists between objects by virtue of their masses (Newton) It is a curvature of space and time around a body (Einstein). Function is obvious from the definition. It exists, question why is redundant, because without it Universe as we know would not have formed. Gravitational force is one of the four basic forces which dictate happenings of the physical universe

Answer 11

Gravity is a curvature in space-time according to Einstein. Normal space may seem to be flat, but in a gravitational field it's curved in the time dimension. Think of it this way: if you draw a curve in an x-y grid, the line will accellerate in one of the dimensions. If you drop a rock in a gravitational field, it will travel straight through space, but traces a curvature in the time dimension by increasing in speed (speed includes time as a factor). According to Einstein all matter produces a local curvature in space-time, resulting in what appears to be gravity. Anything entering a gravitational field will curve, either by pure accelleration if it's falling straight down, or partially in a space dimension if it's at an angle. This includes light, a rock, whatever. Gravity can curve light but only in the space dimensions, since it can't go faster than a set speed. instead of accellerating , it accellerates in a pseudo way by shortening its wavelength, thus gaining energy as if accellerating.