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A 1.2-m-long massless rod is pivoted at one end and swings around in a circle on...

A 1.2-m-long massless rod is pivoted at one end and swings around in a circle on a frictionless table. A block with a hole through the center can slide in and out along the rod. Initially, a small piece of wax holds the block 40 cm from the pivot. The block is spun at 50 rpm , then the temperature of the rod is slowly increased. When the wax melts, the block slides out to the end of the rod.

Part A

What is the final angular velocity? Give your answer in rpm.
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