c10 (9) - Version PREVIEW Chapter 10 Angular Motion Johnson...

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Unformatted text preview: Version PREVIEW Chapter 10 Angular Motion Johnson (84248) 1 This print-out should have 45 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Holt SF 07B 01 001 10.0 points A car tire rotates with an average angular speed of 31 rad/s. In what time interval will the tire rotate 3 . 1 times? Correct answer: 0 . 628319 s. Explanation: Let : avg = 31 rad / s and = 3 . 1 rev . avg = t t = avg = 3 . 1 rev 31 rad / s 2 rad 1 rev = . 628319 s . Holt SF 07B 02 002 10.0 points A girl ties a toy airplane to the end of a string and swings it around her head. The planes average angular speed is 2.5 rad/s. In what time interval will the plane move through an angular displacement of 3.4 rad? Correct answer: 1 . 36. Explanation: Let : avg = 2 . 5 rad / s and = 3 . 4 rad . avg = t t = avg = 3 . 4 2 . 5 = 1 . 36 . keywords: Holt SF 07B 03 003 10.0 points The average angular speed of a fly moving in a circle is 6.9 rad/s. How long does the fly take to move through 2.4 rad? Correct answer: 0 . 347826 s. Explanation: Let : avg = 6 . 9 rad / s and = 2 . 4 rad . avg = t t = avg = 2 . 4 rad 6 . 9 rad / s = . 347826 s . Holt SF 07B 04 004 (part 1 of 4) 10.0 points Consider the following values avg t a +2 . 5 rad 10 . 7 s +0 . 78 rev / s b . 27 s c- 1 . 7 turns 1 . 7 s +2 . 2 rad / s +1 . 1 rad d What is the value of a ? Correct answer: 0 . 233645 rad / s. Explanation: Let : = +2 . 5 and t = 10 . 7 s . avg = t = +2 . 5 rad 10 . 7 s = . 233645 rad / s . 005 (part 2 of 4) 10.0 points What is the value of b ? Correct answer: 1 . 32324 rad. Explanation: Version PREVIEW Chapter 10 Angular Motion Johnson (84248) 2 Let : avg = +0 . 78 rev / s and t = 0 . 27 s . = avg t = (+0 . 78 rev / s) parenleftbigg 2 rad 1 rev parenrightbigg (0 . 27 s) = 1 . 32324 rad . 006 (part 3 of 4) 10.0 points What is the value of c ? Correct answer:- 6 . 28319 rad / s. Explanation: Let : =- 1 . 7 turns and t = 1 . 7 s . avg = t =- 1 . 7 turns 1 . 7 s 2 rad 1 turn =- 6 . 28319 rad / s . 007 (part 4 of 4) 10.0 points What is the value of d ? Correct answer: 0 . 5 s. Explanation: Let : avg = +2 . 2 rad / s , and = +1 . 1 rad . t = avg = +1 . 1 rad +2 . 2 rad / s = . 5 s . Holt SF 07C 01 008 10.0 points A figure skater begins spinning counterclock- wise at an angular speed of 3.1 rad/s. Dur- ing a 4.6 s interval, she slowly pulls her arms inward and finally spins at 7.8 rad/s. What is her average angular acceleration during this time interval?...
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This note was uploaded on 05/06/2011 for the course PHYS 103N taught by Professor Chiu during the Spring '11 term at University of Texas at Austin.

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c10 (9) - Version PREVIEW Chapter 10 Angular Motion Johnson...

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