HW1 Solution

HW1 Solution - lew (dl9564) – hk1 – Opyrchal –...

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Unformatted text preview: lew (dl9564) – hk1 – Opyrchal – (41104) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A girl ties a toy airplane to the end of a string and swings it around her head. The plane’s average angular speed is 2.5 rad/s. In what time interval will the plane move through an angular displacement of 3.3 rad? Correct answer: 1 . 32. Explanation: Let : ω avg = 2 . 5 rad / s and Δ θ = 3 . 3 rad . ω avg = Δ θ Δ t Δ t = Δ θ ω avg = 3 . 3 2 . 5 = 1 . 32 . keywords: 002 10.0 points A figure skater begins spinning counterclock- wise at an angular speed of 3.8 π rad/s. Dur- ing a 4.7 s interval, she slowly pulls her arms inward and finally spins at 8.1 π rad/s. What is her average angular acceleration during this time interval? Correct answer: 2 . 87422 rad / s 2 . Explanation: Let : ω 1 = +3 . 8 π rad / s , Δ t = 4 . 7 s , and ω 2 = +8 . 1 π rad / s . α avg = ω 2- ω 1 Δ t = 8 . 1 π rad / s- 3 . 8 π rad / s 4 . 7 s = 2 . 87422 rad / s 2 ....
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This note was uploaded on 01/22/2009 for the course PHYS Phys 106 taught by Professor Opyrachal during the Fall '08 term at NJIT.

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HW1 Solution - lew (dl9564) – hk1 – Opyrchal –...

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