Zero. -
But only because the Earth is the referance point against which everything else is measured.
It is not logical to say that the potential of an earth-connected object is zero because the earth itself has a non-zero potential. When an object is connected to the earth, its potential will tend to equalize with the earth's potential. So, the potential of an earth-connected object is typically not zero.
The gravitational potential at Earth's surface is considered to be zero as it is the reference point from which gravitational potential energy is measured. Any object at Earth's surface has the potential to fall due to gravity, and this potential energy is typically defined as zero at Earth's surface for convenience in calculations.
Earth's electric potential is zero, as the Earth is used as a reference point for electric potential and is considered to be at a neutral state. This means that objects on Earth are typically at the same electric potential as the Earth itself.
That depends on what reference level you have chosen. If the (arbitrary) reference level you chose is Earth's surface, then anything on the Earth's surface has zero potential energy. If you choose some higher reference level, an object on Earth's surface has a negative potential energy. If you choose a lower reference level, an object on Earth's surface would have a positive potential energy.
It is logical to say that the potential of an earth-connected object is zero because the earth is a large reservoir of charge that can absorb or supply an infinite amount of charge. When an object is connected to the earth, the charges on the object will redistribute until the potential of the object is the same as that of the earth, which is considered zero.
An object gains gravitational potential energy when it is raised above the Earth's surface. The increase in distance from the center of the Earth leads to an increase in potential energy due to the gravitational force between the object and the Earth.
Potential energy arises from the Earth due to the gravitational force acting on an object. When an object is lifted above the ground, it gains potential energy because gravity can do work on it as it falls back down. The potential energy stored in an object is directly related to its height above the Earth's surface.
The gravitational potential at the center of the Earth is zero because all the mass of the Earth is above this point, exerting gravitational force in all directions and creating a balanced potential field.
Earth potential is considered as zero potential because it serves as a common reference point for electrical systems. Any voltage measurement is referenced to the earth potential, making it convenient to establish a standard of zero potential for electrical circuits and grounding systems. This helps in ensuring safety and proper functioning of electrical equipment.
There is no absolute measure for potential energy. The calculation for potential energy depends on the chosen reference level. Quite often, the Earth's surface is chosen as the reference level - in this case, an object on the surface will have zero potential energy.
Gravitational potential energy - it depends on the distance from the centre of gravity, so on Earth it depends on the height above the Earth's surface
The weight and height of an object on Earth give it gravitational potential energy. This type of potential energy is based on the object's position in a gravitational field relative to the surface of the Earth.