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    For ball milling, there is an optimum speed where the centrifugal force at the top of the mill is just balanced by the force of gravity. This caused the balls to be lifted to the maximum height before they fall onto the balls below, thus imparting the most kinetic energy. In practice, the ball mill is run at just below this speed (70–80%).

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    MODULE 4 LIFTING AND RIGGING SM 4 2 ENABLING OBJECTIVES At the conclusion of module the student should be able to: n Understand the basic physics as they relate to mass, gravity, and center of gravity. n Understand moment of force considerations as the relate to the movement of stationary objects. n Explain the concept of elasticity of solids.

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