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¹ Lee, J.Y. (2013). “Private tutoring and its impact on students' academic achievement, formal schooling, and educational inequality in Korea.” Unpublished doctoral thesis. Columbia University.
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diameter record, rotating on a turntable at fifteen revolutions per minute. If the mouse walks straight inwards to a point 
from the center, what will be its new angular velocity? Assume the mass of the record is negligible.