Physics hw 9

# Physics hw 9 - mata(jpm2873 HW#9 Antoniewicz(57420 This...

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mata (jpm2873) – HW #9 – Antoniewicz – (57420) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001(part1of3)4.0points 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 . 26 rad / s to 3 . 36 rad / s in 33 . 93 s . Determine the magnitude of the angular acceleration after 3 . 47 s. Answer in units of rad / s 2 . 002(part2of3)3.0points How many revolutions does the wheel make after 2 . 56 s ? Answer in units of rev. 003(part3of3)3.0points Find the number of revolutions it makes be- fore coming to rest. Answer in units of rev. 004 10.0points The net work done in accelerating a propeller from rest to an angular speed of 140 rad/s is 4292 . 3 J. What is the moment of inertia of the pro- peller? Answer in units of kg · m 2 . 005 10.0points A uniform solid disk of radius 7 . 52 m and mass 60 . 6 kg is free to rotate on a frictionless pivot through a point on its rim.

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