4. A bucket of water is set spinning about its symmetry axis. Determine the shape of the water surface in the bucket.

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A: Answer: ◆ The turbine work is 441 kW. ◆ Therefore, the correct answer is option (B).

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Center of Gravity and Centroid

The term center of gravity indicates the position or location of a point about which the whole weight of a body or system is supposed to be concentrated, which means the whole weight of the body or system works through this point. It is closely related to mass distribution. For all positions of the body, the center of gravity would be a single point.