A student, sitting on a stool rotating at a rate of 38 RPM, holds masses in each hand. When his arms are extended, the total rotational inertia of the system is 7.5 kg · m2. He pulls his arms in close to his body, reducing the total rotational inertia to 4.5 kg · m2. If there are no external torques, what is the new rotational velocity of the system? RPM?

Given: Rotation speed of stool n1 = 38 RPM Inertia of the system when hands are open I1 = 7.5 kg.m2…

Answered: A student, sitting on a stool rotating…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter10: Rotational Motion

Section: Chapter Questions

Problem 56P: A student sits on a freely rotating stool holding two dumbbells, each of mass 3.00 kg (Fig. P10.56)....

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A student, sitting on a stool rotating at a rate of 38 RPM, holds masses in each hand. When his arms are extended, the total rotational inertia of the system is 7.5 kg · m². He pulls his arms in close to his body, reducing the total rotational inertia to 4.5 kg · m². If there are no external torques, what is the new rotational velocity of the system?

RPM?

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