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That completely depends on the rock's shape, and on how its mass is

distributed. It has nothing to do with the value of its mass or weight.

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Q: What is the center of gravity of a rock of 8kg?
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What the Combined center of gravity is formed by?

The center of gravity of the truck


Where does an object center of gravity always lie?

It is always different depending on the object. For example a female humans' center of gravity is in the hip. as a male humans' center of gravity is in the chest. But once you have found the center of gravity in an object the center of gravity should be the same in every object like it.


Does the center of mass of an object ever differ from the center of gravity?

The center of mass and center of gravity serve two separate purposes. As an individual, your center of gravity and center of mass remains the same. The earth has a center of mass. The moon has a center of mass. The moon does not orbit the earth. They orbit their center of gravity. Their center if gravity is always changing. It is not a fixed point. When an airplane takes off, its center of gravity is one place. As it burns fuel, its center of gravity changes. It might be necessary to change its attitude, which today is done automatically by computers. The computers are checked at the end of the flight by human beings.


Can an object have more than one center of gravity?

No, objects cannot have more than one center of gravity. The center of gravity of an object can however change.


What is center of gravity of a body?

The center of gravity is the theoretical point where all the body weight is concentrated or the theoretical point about which the body weight is evenly distributed. If a body is of uniform density and has a symmetrical shape the center of gravity is in the geometric center. If the object is not symmetrical and does not have uniform density, it is more difficult to describe the location of its center of gravity.