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A crumb from a peanut butter and banana sandwich has fallen on a rotating record at a distance of 3.5 cm from the axis of

A crumb from a peanut butter and banana sandwich has fallen on a rotating record at a distance of 3.5 cm from the axis of rotation. The record is rotating at 78.0 rev/min. What is the period of the rotation and the magnitude of the centripetal acceleration of the crumb?

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