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Q: Can center of mass of body be outside the body?

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Yes, a body can have its center of mass outside its body. For example, a ring.

Yes, that is correct. The center of mass of a ring is the geometric center, which is not part of the ring itself.

For a symmetric body in all directions the center of mass is always located at its geometric center.

For a uniform symmetric body in all directions the center of mass and center of gravity are the same point.

In that case, the mass will also be 10 kg.

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Yes, a body can have its center of mass outside its body. For example, a ring.

Yes, that is correct. The center of mass of a ring is the geometric center, which is not part of the ring itself.

where is the centre of mass in the human body

Every speck of mass throughout any solid body "has gravity", and attracts every other speck of mass. But when you're outside of the solid body, the gravitational effect of all those specks of mass is exactly as if all of its mass were located at its "center of mass" or "center of gravity". For a homogeneous spherical object, that point is the center of the sphere.

Center of mass is the point where the entire mass of body can be concentrated. As the force applied on a body passes through its center of mass then the body gets displaced other wise that will be rotated about the axis passing through its center of mass.

Center of mass is defined as the point about which the sum of mass moment vectors of all the points of the body is equal to zero.

For a symmetric body in all directions the center of mass is always located at its geometric center.

No, many objects have no mass (at least no mass that is part of the body concerned) at their centre of mass. Not ,necessarily. Center of mass is an imaginary point.(at least no mass that is part of the body concerned)

For a single body, the center of gravity (center of mass) must be within the object. It is the single point at which all of an object's mass can be considered to act. For multiple bodies in a system, the center of mass can fall within a body or anywhere between bodies. The joint center of mass is called the "barycenter."

For a uniform symmetric body in all directions the center of mass and center of gravity are the same point.

Center of Mass is dependent on the distribution of the weight throughout the body; Whereas Geometric center is independent of the mass of the body and is the central point of the system based on its geometry (shape and size).

Center of mass is defined as the point about which the sum of mass moment vectors of all the points of the body is equal to zero. Center of mass = [(mass of a point object)*(distance of that point from origin)]/(Total mass) For a rigid body we need to integrate this expression.

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