Applied Mechanics and Graphic Statics
The centre of gravity of a homogeneous body is the point at which the whole

All listed here
Area of the surface of the body is assumed to be concentrated
Weight of the body is assumed to be concentrated
Volume of the body is assumed to be concentrated

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Applied Mechanics and Graphic Statics
Free body diagram is an

Isolated joint with internal forces acting on it
Isolated joint with only body forces acting on it
None of these
Isolated joint with all the forces, internal as well as external, acting on it

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