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# HW8 - yang(ey942 HW08 TSOI(58160 This print-out should have...

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yang (ey942) – HW08 – TSOI – (58160) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A rigid circular wheel spins at constant angu- lar velocity about a stationary axis. Choose the picture below that correctly describes the relative magnitudes and directions of the ve- locity vector of points on the wheel. 1. 2. 3. 4. 5. correct 6. 7. 8. Explanation: Any point on the wheel travels in a circle around the axis, so the velocities of all points are directed parallel to tangents to the wheel. The wheel is rigid, so all points on the wheel travel with the same angular velocity. v = ωr so the points farther from the axis travel faster than the points closer to the axis. keywords: 002 (part 1 of 4) 10.0 points A potter’s wheel of radius 16 cm starts from rest and rotates with constant angular accel- eration until at the end of 29 s it is moving with angular velocity of 12 rad / s. What is the angular acceleration? Correct answer: 0 . 413793 rad / s 2 . Explanation: Let : ω = 12 rad / s , ω 0 = 0 , and t = 29 s . Since the angular acceleration is constant, α = Δ ω Δ t = ω t = 12 rad / s 29 s = 0 . 413793 rad / s 2 . 003 (part 2 of 4) 10.0 points What is the linear velocity of a point on the rim at the end of the 29 s?

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