Conceptual Physics: The High School Physics Program
9th Edition
ISBN: 9780133647495
Author: Paul G. Hewitt
Publisher: Prentice Hall
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Textbook Question
Chapter 12, Problem 16A
Why are your answers different to the previous two questions?
Expert Solution & Answer
To determine
To explain: The difference in the results obtained for angular momentum and spin rate.
Answer to Problem 16A
Since angular momentum tends to remain conserved, spin rate changes as the rotational inertia changes.
Explanation of Solution
Introduction: Angular momentum is the product of rotational inertia and spin rate.
Angular momentum of an object tends to remain conserved. If a skater pulls her arms in while spinning to reduce her rotational inertia to half, the spin rate similarly, increases by the same proportion to keep the angular momentum conserved. Thus, the spin rate will increase twice.
Conclusion: Thus, to keep the angular momentum conserved, if rotational inertia decreases then the spin rate increases by the same proportion.
Chapter 12 Solutions
Conceptual Physics: The High School Physics Program
Ch. 12 - What is the law of inertia for rotation?Ch. 12 - Does the rotational inertia of an object differ...Ch. 12 - Which is easier to get swinging, a baseball bat...Ch. 12 - Which has a greater rotational inertia, a cylinder...Ch. 12 - Which will swing to and fro more often, a short...Ch. 12 - Why does bending your legs when running enable you...Ch. 12 - What are the three principal axes of rotation for...Ch. 12 - How does a skater decrease his or her rotational...Ch. 12 - Which will have the greater acceleration rolling...Ch. 12 - Distinguish between linear momentum and angular...
Ch. 12 - The text says that angular momentum is 10, then...Ch. 12 - Momentum is conserved when there is no net...Ch. 12 - What does it mean to Say that angular momentum is...Ch. 12 - If a skater who is spinning pulls her arms in so...Ch. 12 - If a skater who is spinning pulls her arms in so...Ch. 12 - Why are your answers different to the previous two...Ch. 12 - How can gravity be simulated in an orbiting space...Ch. 12 - How will the value of g vary at different...Ch. 12 - Three iron shapes of the same mass rotate about...Ch. 12 - Beginning from a rest position, a solid disk A, a...Ch. 12 - Perky rides at different radial distances from the...Ch. 12 - Students Art, Bart, Cis, and Dot sit on a rotating...Ch. 12 - Mei Fan says that a basketball has greater...Ch. 12 - Stand two metersticks against the wall and let...Ch. 12 - Why is a stick with a wad of clay at the top...Ch. 12 - Prob. 26ACh. 12 - If you walked along the top of a fence, why would...Ch. 12 - Which will have the greater acceleration rolling...Ch. 12 - Any rolling object takes more time to roll down an...Ch. 12 - Jim says that in race between a can of water and a...Ch. 12 - Consider two rotating bicycle wheels, one filled...Ch. 12 - You sit in the middle of a large, freely rotating...Ch. 12 - A sizable quantity of soil is washed down the...Ch. 12 - If all of Earths inhabitants moved to the equator,...Ch. 12 - If the worlds populations move to the North and...Ch. 12 - If the polar ice caps of Earth were to melt, the...Ch. 12 - A toy train is initially at rest on a track...Ch. 12 - Why does a typical small helicopter with a single...Ch. 12 - We believe our galaxy was formed from a huge cloud...Ch. 12 - An occupant inside a rotating space habitat of the...Ch. 12 - Explain why the faster Earth spins, the less a...Ch. 12 - What happens to the rotational inertia of a simple...Ch. 12 - What happens to the rotational inertia of a simple...Ch. 12 - What happens to the rotational inertia of a simple...Ch. 12 - A pair of identical 1000-kg space pods in outer...Ch. 12 - The two-pod system in the previous question...Ch. 12 - Gretchen moves at a speed of 6.0 m/s when sitting...Ch. 12 - If a trapeze artist rotates twice each second...Ch. 12 - A 0.60-kg puck revolves at 2.4 m/s at the end of a...Ch. 12 - Gather a selection of canned foods. Predict which...
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