Please help me with these questions

Part A A student sitting on a chair on a circular platform of negligible mass rotates freely on an air table at initial rotational speed 1.7 rad/s . The student's Determine the student's final rotational speed. arms are initially extended with 6.0-kg dumbbells Express your answer to two significant figures and include the appropriate units. in each hand. As the student pulls her arms in toward her body, the dumbbells move from a distance of 0.80 m to 0.10 m from the axis of OB ? rotation. The initial rotational inertia of the student's body (not including the dumbbells) with arms extended is 6.0 kg . m and her final rotational WE = inertia is 5.0 kg . m Value Units Submit Request Answer Part BPart A Determine the change in rotational kinetic energy when the rotational velocity of the turntable of a stereo system increases from 0 to 33 rpm. Its rotational inertia is 6.4 x 10 3 kg . m Express your answer to two significant figures and include the appropriate units. 0 0 ? Krotational = Value Units Submit Request AnswerConstants Part B Consider a particle of mass m = 25.0 kg revolving around an axis with angular speed w. The perpendicular distance from the particle to the axis is r = 1.50 m . ( Assume w = 32.0 rad/s . What is the magnitude v of the velocity of the particle in m/s? Figure 1) AEd Figure 1 of 1 m/s Submit Request Answer Part C