solution 10 - reyes(mr29667 Homework 10 chelikowsky(59005...

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reyes (mr29667) – 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 . 65 rad / s 2 has an angular velocity oF 1 . 7 rad / s and an angular position oF 6 . 3 rad. What is the angular position oF the wheel aFter 5 s? Correct answer: 6 . 675 rad. Explanation: Let : α = 0 . 65 rad / s 2 , ω 0 = 1 . 7 rad / s , θ 0 = 6 . 3 rad , and t = 5 s . The angular position is θ f = θ 0 + ω 0 t + 1 2 αt 2 = 6 . 3 rad + (1 . 7 rad / s) (5 s) + 1 2 ( 0 . 65 rad / s 2 ) (5 s) 2 = 6 . 675 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 5 . 31 rad / s to 4 . 21 rad / s in 3 . 92 s . Determine the magnitude oF the angular acceleration aFter 2 . 45 s. Correct answer: 0 . 271976 rad / s 2 .
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solution 10 - reyes(mr29667 Homework 10 chelikowsky(59005...

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