solution_pdf17 - reddy(ar38357 Rotational kinematics...

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reddy (ar38357) – Rotational kinematics – clancy – (SCI411-2) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points A record has an angular speed of 37 . 2 rev / min. What is its angular speed? Correct answer: 3 . 89558 rad / s. Explanation: Let : ω = 37 . 2 rev / min . ω = (37 . 2 rev / min) parenleftbigg 2 π rad rev parenrightbigg parenleftbigg 1 min 60 s parenrightbigg = 3 . 89558 rad / s . 002 (part 2 of 2) 10.0 points Through what angle does it rotate in 0 . 7 s? Correct answer: 2 . 7269 rad. Explanation: Let : t = 0 . 7 s . θ = ω t = (3 . 89558 rad / s) (0 . 7 s) = 2 . 7269 rad . 003 10.0 points A girl sitting on a merry-go-round moves counterclockwise through an arc length of 4.07 m. If the girl’s angular displacement is 1.82 rad, how far is she from the center of the merry-go-round? Correct answer: 2 . 23626 m. Explanation: Let : Δ s = 4 . 07 m and Δ θ = 1 . 82 rad . Δ s = r Δ θ r = Δ s Δ θ = 4 . 07 m 1 . 82 rad = 2 . 23626 m . keywords: 004 10.0 points The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an an- gular speed of 3 . 7 rev / s in 11 s . At this point the person doing the laundry opens the lid, and a safety switch turns off the washer. The tub slows to rest in 8 s . Through how many revolutions does the tub turn? Assume constant angular accelera- tion while it is starting and stopping.
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