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Homework 10-solutions

Homework 10-solutions - yindeemark(rry82 Homework 10...

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yindeemark (rry82) – Homework 10 – chelikowsky – (59005) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points At t = 0, a wheel rotating about a fxed axis at a constant angular deceleration oF 0 . 46 rad / s 2 has an angular velocity oF 0 . 9 rad / s and an angular position oF 6 . 6 rad. What is the angular position oF the wheel aFter 4 s? Correct answer: 6 . 52 rad. Explanation: Let : α = 0 . 46 rad / s 2 , ω 0 = 0 . 9 rad / s , θ 0 = 6 . 6 rad , and t = 4 s . The angular position is θ f = θ 0 + ω 0 t + 1 2 αt 2 = 6 . 6 rad + (0 . 9 rad / s) (4 s) + 1 2 ( 0 . 46 rad / s 2 ) (4 s) 2 = 6 . 52 rad . 002 (part 1 oF 3) 10.0 points As a result oF Friction, the angular speed oF a wheel c hanges with time according to d θ d t = ω 0 e - σ t , where ω 0 and σ are constants. The angular speed changes From an initial angular speed oF 4 . 81 rad / s to 3 . 31 rad / s in 3 . 92 s . Determine the magnitude oF the angular acceleration aFter 2 . 75 s. Correct answer: 0 . 352832 rad / s 2 .
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Homework 10-solutions - yindeemark(rry82 Homework 10...

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