Gravity

When the earth is spinning, the rotation along with gravity creates centrifugal force. This is the same as the force that happens when you swing a yo-yo around by the string, the string is like gravity in that scenario holding the yo-yo close to you.

Perhaps you mean "specific gravity". That refers to an object's density, compared to the density of a reference subtance (usually water). For example, if iron has 8 times the density of water, then its specific gravity is said to be 8.

Gravity is everywhere, it's just that it's too weak to actually observe

That refers to using the gravity of a planet - for example Jupiter - to speed up a spacecraft. Note that the spacecraft approaches the planet with a certain speed, and goes away from it at the same speed, with respect to the planet. However, since in doing so it changes direction, and since the planet orbits the Sun, it is possible to set things up so that the spacecraft leaves with a greater speed with respect to the Sun.

No. Gravity is dependent on two factors: the mass of the object in question and the distance from its center of mass. So gravity at Earth's surface is dependent on its mass and radius, and Earth is the dominant gravitational body for some distance, but elsewhere, other objects dominate with their own gravity.

That sounds like a galaxy. It could also be a galaxy cluster or a supercluster.

Smoke rises because it is less dense than the surrounding air. When smoke is released, it is filled with hot air and particles that are lighter than the surrounding cooler air, so it naturally moves upwards. Additionally, the movement of air currents and convection also play a role in pushing smoke upwards.

Elevation affects the strength of gravity, which in turn affects weight. As elevation increases, the force of gravity decreases slightly, leading to a slightly lower weight compared to being at sea level. This effect is more pronounced at higher elevations, such as at the top of mountains.

The variables that affect gravity include mass and distance. The larger the mass of an object, the stronger its gravitational pull. Additionally, the distance between two objects also affects the strength of gravity, with gravity decreasing as distance increases.

The acceleration due to Gravity is constant at 32 feet per second per second, if you dropped a feather and a cannon ball in a vacuum they would fall at the same rate and hit the floor at he same time.

Specific gravity is not measured in pounds. It is a dimensionless quantity, which results by dividing (in this case) the density of aliminium, by the density of a reference substance, usually water. The result of the division will be the same, whether you use international units (SI, i.e. metric), or obsolete units.

You need gravity to stay in bed, but you don't need it to sleep. In microgravity or

weightlessness, once you get used to the feeling of always falling, you can sleep

quite nicely. It's wise, though, to arrange some sort of restraint, just so you don't

go floating around the whole crew quarters every time you turn over. So the crew

of the bygone Space Shuttle, for example, or the International Space Station, just

slip into their bags, which are loosely tied or buckled to the wall/floor/ceiling, and

drift off.

Reducing the Earth's gravity is not currently possible with existing technology. Gravity is a fundamental force determined by the mass of the Earth, and altering it would require significant, currently unrealistic, changes to the planet's mass or composition.

A gravity sensor is a device that measures the acceleration due to gravity in a particular direction. It is commonly used in smartphones and other electronic devices to orient the screen display based on the device's position.

Earth is slowly flattening out. Our planet used to be almost exactly spherical when it just formed, but over time it squashed out. You can test this by taking a piece of salt dough and rolling it into a ball. Then, put it inside a pail with a long string handle. Whirl the pail around your head for a while, then examine the salt dough. It will be flattened.

To make salt dough: Mix salt, flour, and water.

In the case of a parachute, the person and parachute fall at a constant speed once the forces acting on them are balanced. This means that the net acceleration, including gravity, is zero. Gravity is still acting on the person and parachute, but it is balanced by the drag force exerted by the parachute, resulting in a constant speed descent.

nope

A person can increase the magnitude of the gravitational forces that attract

the Earth and him to each other, by increasing his intake of energy sources

such as sweets, concoctions based on high fructose corn syrup, large quantities

of marbled beef and sugary soda, rich French and Danish pastries, as well as the

American delicacy known as "sticky buns". As a concommittant pursuit, one must

limit all forms of muscular activity, both indoors and out, and should rest, either

sitting or supine, before a source of a wide range of entertainment, such as a

radio, TV, movie source, video gaming console, or computer with fast access

to the internet. When adhered to in a conscientious routine, these simple acts

will lead dependably to an increase in the subject's mass, and then ... since the

forces of gravity between any two objects are directly proportional to the product

of the masses, the gravitational force on the individual will increase in direct proportion

to the increase in his mass.

No, an island cannot float in midair because it is made of solid rock or land that is attached to the Earth's crust. Islands are formed either through volcanic activity or by being part of a larger landmass that gets surrounded by water.

The same factors that determine the force of gravity between ANY objects. (1) The masses involved, (2) the distance between the masses.

" ... decreases."

Gravitational force is inversely proportional to the square of the distance

between the objects.

Gravity is certainly not necessary in order to do experiments. In fact, there are

some experiments that can ONLY be done in zero gravity ... like for example an

experiment to determine how seeds decide which way to send roots and where

to extend the green shoots when there is no 'up' or 'down', or whether fruit-flies

can maintain their sanity in zero gravity and continue their important mating work.

If there were no gravity, period, there would be no stars. If gravity ceased to work, there would be a whole lot of violent explosions as the nuclear, mechanical and other forces within the stars popped the stellar balloons, so to speak.