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Unformatted text preview: lai (yl8859) – HW15 – Ross – (15200) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (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 e − σ t , where ω and σ are constants. The angular speed changes from an initial angular speed of 5 . 53 rad / s to 4 . 73 rad / s in 3 . 92 s . Determine the magnitude of the angular acceleration after 1 . 88 s. Answer in units of rad / s 2 . 002 (part 2 of 3) 10.0 points How many revolutions does the wheel make after 1 . 15 s ? Answer in units of rev. 003 (part 3 of 3) 10.0 points Find the number of revolutions it makes be- fore coming to rest. Answer in units of rev. 004 (part 1 of 4) 10.0 points A bug is on the rim of a disk of diameter 10 in that moves from rest to an angular speed of 75 rev / min in 6 . 3 s....
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