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Unformatted text preview: khounvivongsy (sk27799) – Chapter 10 Practice  Rotational Kinematics – Weathers – (17104) 1 This printout should have 19 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. This problem set is NOT for credit; it is practice/review for Exam 2 001 10.0 points A girl sitting on a merrygoround moves counterclockwise through an arc length of 4.92 m. If the girl’s angular displacement is 1.31 rad, how far is she from the center of the merrygoround? Correct answer: 3 . 75573 m. Explanation: Let : Δ s = 4 . 92 m and Δ θ = 1 . 31 rad . Δ s = r Δ θ r = Δ s Δ θ = 4 . 92 m 1 . 31 rad = 3 . 75573 m . keywords: 002 10.0 points A car tire rotates with an average angular speed of 28 rad/s. In what time interval will the tire rotate 3 . 8 times? Correct answer: 0 . 852718 s. Explanation: Let : ω avg = 28 rad / s and Δ θ = 3 . 8 rev . ω avg = Δ θ Δ t Δ t = Δ θ ω avg = 3 . 8 rev 28 rad / s · 2 π rad 1 rev = . 852718 s . 003 (part 1 of 2) 10.0 points A wheel starts from rest and rotates with constant angular acceleration to an angular speed of 5 . 7 rad / s in 3 . 96 s. Find the magnitude of the angular acceler ation of the wheel. Correct answer: 1 . 43939 rad / s 2 . Explanation: Let : Δ ω = 5 . 7 rad / s and Δ t = 3 . 96 s . Angular acceleration is α = Δ w Δ t = 5 . 7 rad / s 3 . 96 s = 1 . 43939 rad / s 2 . 004 (part 2 of 2) 10.0 points Find the angle in radians through which it rotates in this time. Correct answer: 11 . 286 rad. Explanation: The angle through which the wheel rotates during this time interval is θ = 1 2 α t 2 = 1 2 (1 . 43939 rad / s 2 ) (3 . 96 s) 2 = 11 . 286 rad . keywords: 005 (part 1 of 2) 10.0 points A grinding wheel, initially at rest, is ro tated with constant angular acceleration of khounvivongsy (sk27799) – Chapter 10 Practice  Rotational Kinematics – Weathers – (17104) 2...
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This note was uploaded on 02/08/2010 for the course PHYS 1710 taught by Professor Weathers during the Fall '09 term at University of North Carolina Wilmington.
 Fall '09
 weathers
 Physics

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