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Two rods have the same mass and length, but the mass is distributed differently. One rod has the mass concentrated at the ends and the

Two rods have the same mass and length, but the mass is distributed differently. One rod has the mass concentrated at the ends and the other has the mass concentrated at the center. The two rods are held at their centers and rotated back and forth. Which one is easier to rotate? What is a possible physical explanation for this?
 
 

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