Determine the final kinetic energy of the system

Reference no: EM13299368

A student on a piano stool rotates freely with an angular speed of 3.05rev/s . The student holds a 1.45kg mass in each outstretched arm, 0.779m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two masses, is 5.13kg.m^2 , a value that remains constant.

(a) As the student pulls his arms inward, his angular speed increases to 3.81rev/s . How far are the masses from the axis of rotation at this time, considering the masses to be points?

(b) Calculate the initial kinetic energy of the system.

Reference no: EM13299368

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