Gravity

The answer is more complicated than a mere 'yes' or 'no'. Dr. Stephen Hawking predicted that black holes emit a certain amount of thermal radiation (this became known as Hawking radiation). According to his predictions, the amount of radiation emitted by a particular black hole is inversely proportional to its mass. If he is correct, it means that there is a critical point where the mass of the black hole results in Hawking radiation emissions of a 'temperature' equal to that of the cosmic microwave background, approximately 2.7K (you can think of this as the temperature of space). Any larger, and even the cosmic microwave background serves to feed the black hole. Any smaller, and it will eventually evaporate.

The exact mass needed for such an occurance (the 'critical mass') is not something that can be easily written down. It varies, somewhat, based on the type of black hole. That said, any black holes of mass equal to, or less than, that of the Moon could generally be expected to evaporate over time.

All of this is speculation, however. Any black hole of sufficient mass to remain stable over time will emit so little radiation that it will be indistinguishable from the cosmic microwave background. Only a short lived black hole could be observed in such a manner, and we have yet to observe any.

The pull of gravity is stronger at the poles and weaker at the equator due to the Earth's rotation. This causes objects to be slightly heavier at the poles than at the equator, which is evidence of the Earth's spherical shape. Additionally, the way objects fall toward the center of the Earth in all directions indicates a spherical geometry.

The force of attraction between the Earth and all other particles of matter in its atmosphere. The acceleration of gravity on Earth is 9.81m/s^2. This means that, no matter what the weight of the object is, it accelerates towards the Earth at 9.81 m each second and the Earth 9.81 m towards it.

Gravity can be simulated in an orbiting spaceship through methods like rotation, producing centrifugal force that mimics the effects of gravity. This can create a feeling of weight and stability for astronauts on board. Additionally, there are artificial gravity systems that use acceleration or magnetism to replicate gravitational forces in space.

The moon has one-sixth of the Earths gravity.

The space shuttle is in a state of free fall around Earth, following an orbit, which counteracts the force of gravity pulling it down. This allows the space shuttle to remain in a stable path without being pulled down by gravity.

If there was no gravity on Earth, everything would float freely in space. Objects would not be pulled towards the Earth's center, causing disruptions in our everyday activities, such as walking, driving, and even breathing. The absence of gravity would lead to a completely different and challenging environment for life on Earth.

Yes. For example in the case of a doughnut shape, the center of gravity is in the center of the doughnut - and that is outside the doughnut.

Or a boomerang or horseshoe type shape, the center of gravity could easily position off of the object.

Yes, both Ganymede and Callisto, which are moons of Jupiter, have gravity due to their mass. However, the gravitational force on these moons is weaker than on Earth because they are much smaller and less massive.

Frequency and density aren't involved as 'bare quantities' in force.

The bare quantities that constitute force are mass, length, and time,

and the physical dimension of force is

(mass) x (length)/(time)2 .

The 'length' and 'time' combine to result in (length)/(time)2, and that's

the 'acceleration' that you did include.

It is impossible to actually "defy" gravity. Even the Voyager spacecraft at over four billion miles from the earth experience some gravity from the earth. Satellites can orbit the earth at as low as 220 miles or less. They still fall toward the earth, but their forward speed carries them at an arc that matches the earth's surface.

Yes, there is gravity on the moon, but it is much weaker than on Earth. The gravitational pull on the moon is about 1/6th of that on Earth, so astronauts on the moon experience lower gravity.

The Gravity on the Moon is much weaker than the Gravity on Earth, the Moon's gravity is about 1/6 of the Gravity on Earth. So for example: An Object that weighs 690 N on Earth will weigh 115 N on the moon. In order to get your answer, just divide any number by 6 and you will get your answer.

Answer:

360 N on Earth will result as 60 N on the moon.

Because the object's inertial motion is equal to the gravitational acceleration.

Weight equals mass times gravitational acceleration (W=mg), so you would feel weightless, but your mass stays the same.

Compared to what ?

-- Compared to the surface of Mars, it's 43.7% as much.

-- Compared to the surface of Pluto, it's 2.8 times as much.

-- Compared to the surface of the Earth, it's 16.5% as much.

Io is a moon of Jupiter, not a planet. Surface gravity is about 18% of the gravity on Earth.

Yes, gravity pulls a spacecraft towards the nearest planet because objects with mass attract each other. The gravitational force between the spacecraft and the planet causes the spacecraft to be pulled towards the planet as it travels through space.

They feel weightless because they are indeed weightless when in orbit, in effect in freefall. Gravity tries to pull them down but the spacecraft motion carries it "past the planet" in an arc that is part of a circular or elliptical orbit. If the spacecraft slows down, it will be pulled toward the Earth by the considerable gravitational force.

If an astronaut tries to use an ordinary scale to measure her weight, all attempts will be useless. The vessel she is in is under the influence of Earth's gravity, it is true, as is her body. But the vessel and her body are in the same orbit, at the same velocity. If she is motionless at the center of the vessel, no unbalanced forces will push her "down" toward the floor or hull of the vessel. And if there are some unbalanced forces, they are so small as to be negligible for all practical purposes. She will not be able to 'step' onto a scale, unless she is in some kind of rotating vessel, which would provide a kind of artificial gravity.

A tablecloth.

Gravity is the force that holds the Sun together, causing it to contract and generate the high pressure and temperature at its core that sustains nuclear fusion reactions. The Sun's massive gravity also keeps the planets in orbit around it, maintaining the stability of our solar system.

Yes, in free fall, the distance the object travels increases at a rate proportional to the square of the time elapsed, as described by the equation d = 1/2 * g * t^2, where d is the distance fallen, g is the acceleration due to gravity, and t is the time.

The story of the apple falling on Isaac Newton's head is a popularized version of the events that led him to develop his theory of gravity. Newton's law of universal gravitation describes the attraction between objects with mass, like the apple and Earth, and explains how the moon stays in orbit around Earth.

The moon's gravity is about 1/6th (16.5%) as strong as Earth's gravity. This means that an object on the moon weighs about 1/6th of what it weighs on Earth.

Jupiter has enough gravity to hold on to most gases because it is the largest planet in our solar system. Its strong gravitational pull prevents gases from escaping into space, allowing it to maintain its thick atmosphere.