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9 57% 7:12 PM Sun Dec 8 60.0 N| E) ON· m 40.0 N 20) A steady horizontal force F of magnitude 21 N is applied at the axle of a solid disk as shown and disk rolls without slipping. The disk has mass 2.0 kg and diameter 0.10 m. What is the linear speed of the center of the disk after it has moved 12 m? (I = (1/2)MR? for solid disk). A) 9.0 m/s B) 13 m/s C) 16 m/s D) 22 m/s E) 44 m/s F = ma F = 21 N 10.5 I = 0.0025 38.197 vev 10.5 = 0.1d w²= Wo? +2Q AO &=105 38.197 rev. Irev 239.99 = 8 w2 = 2( (05)(239.99) V=22.4 W=224 AU19 OSU Physics 1200 Nandyala Sample Final Page 7 of 12 Name: Recitation Instructor Name: (write on every page) (write on every page) 12 21) A 60.0-kg skater begins a spin with an angular speed of 6.0 rad/s. By changing the position of her arms, the skater decreases her moment of inertia to one-half its initial value. What is the skater's final angular speed?

9 57% 7:12 PM Sun Dec 8 60.0 N| E) ON· m 40.0 N 20) A steady horizontal force F of magnitude 21 N is applied at the axle of a solid disk as shown and disk rolls without slipping. The disk has mass 2.0 kg and diameter 0.10 m. What is the linear speed of the center of the disk after it has moved 12 m? (I = (1/2)MR? for solid disk). A) 9.0 m/s B) 13 m/s C) 16 m/s D) 22 m/s E) 44 m/s F = ma F = 21 N 10.5 I = 0.0025 38.197 vev 10.5 = 0.1d w²= Wo? +2Q AO &=105 38.197 rev. Irev 239.99 = 8 w2 = 2( (05)(239.99) V=22.4 W=224 AU19 OSU Physics 1200 Nandyala Sample Final Page 7 of 12 Name: Recitation Instructor Name: (write on every page) (write on every page) 12 21) A 60.0-kg skater begins a spin with an angular speed of 6.0 rad/s. By changing the position of her arms, the skater decreases her moment of inertia to one-half its initial value. What is the skater's final angular speed?

Principles of Physics: A Calculus-Based Text
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 50P: A disk with moment of inertia I1 rotates about a frictionless, vertical axle with angular speed i. A...
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The answer key from the professor says the answer is 13, but we keep getting 22. Can you help explain where we went wrong?

9 57% 7:12 PM Sun Dec 8 60.0 N| E) ON· m 40.0 N 20) A steady horizontal force F of magnitude 21 N is applied at the axle of a solid disk as shown and disk rolls without slipping. The disk has mass 2.0 kg and diameter 0.10 m. What is the linear speed of the center of the disk after it has moved 12 m? (I = (1/2)MR? for solid disk). A) 9.0 m/s B) 13 m/s C) 16 m/s D) 22 m/s E) 44 m/s F = ma F = 21 N 10.5 I = 0.0025 38.197 vev 10.5 = 0.1d w²= Wo? +2Q AO &=105 38.197 rev. Irev 239.99 = 8 w2 = 2( (05)(239.99) V=22.4 W=224 AU19 OSU Physics 1200 Nandyala Sample Final Page 7 of 12 Name: Recitation Instructor Name: (write on every page) (write on every page) 12 21) A 60.0-kg skater begins a spin with an angular speed of 6.0 rad/s. By changing the position of her arms, the skater decreases her moment of inertia to one-half its initial value. What is the skater's final angular speed?
Transcribed Image Text:9 57% 7:12 PM Sun Dec 8 60.0 N| E) ON· m 40.0 N 20) A steady horizontal force F of magnitude 21 N is applied at the axle of a solid disk as shown and disk rolls without slipping. The disk has mass 2.0 kg and diameter 0.10 m. What is the linear speed of the center of the disk after it has moved 12 m? (I = (1/2)MR? for solid disk). A) 9.0 m/s B) 13 m/s C) 16 m/s D) 22 m/s E) 44 m/s F = ma F = 21 N 10.5 I = 0.0025 38.197 vev 10.5 = 0.1d w²= Wo? +2Q AO &=105 38.197 rev. Irev 239.99 = 8 w2 = 2( (05)(239.99) V=22.4 W=224 AU19 OSU Physics 1200 Nandyala Sample Final Page 7 of 12 Name: Recitation Instructor Name: (write on every page) (write on every page) 12 21) A 60.0-kg skater begins a spin with an angular speed of 6.0 rad/s. By changing the position of her arms, the skater decreases her moment of inertia to one-half its initial value. What is the skater's final angular speed?
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