An ice skater, whose rotational inertia is I = 4 kg·m2 with her arms close to her body, is spinning at 2 rad/s. She then fully extends her arms, changing her rotational inertia to 8 kg·m2. Which of the following is true? a.) Her angular momentum remains the same. b.) Her angular velocity decreases. c.) Her kinetic energy decreases. d.) All of the above. e.) B and C. d.) None of the above.
An ice skater, whose rotational inertia is I = 4 kg·m2 with her arms close to her body, is spinning at 2 rad/s. She then fully extends her arms, changing her rotational inertia to 8 kg·m2. Which of the following is true? a.) Her angular momentum remains the same. b.) Her angular velocity decreases. c.) Her kinetic energy decreases. d.) All of the above. e.) B and C. d.) None of the above.
University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter10: Fixed-axis Rotation
Section: Chapter Questions
Problem 64P: While punting a football, a kicker rotates his leg about the hip joint. The moment of inertia of the...
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An ice skater, whose rotational inertia is I = 4 kg·m2 with her arms close to her body, is spinning at 2 rad/s. She then fully extends her arms, changing her rotational inertia to 8 kg·m2. Which of the following is true?
a.) Her
b.) Her
c.) Her kinetic energy decreases.
d.) All of the above.
e.) B and C.
d.) None of the above.
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