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Unformatted text preview: Physics 125 Discussion #15 Solution 1 Problem 1: Throwing a discus A discus thrower moves the discus in a circle of radius 80.0 cm. At a certain instant, the thrower is spinning at an angular speed of 10.0 rad/s and the angular speed is increasing at 50.0 rad/s 2 . 1. What is the tangential component of the acceleration of the discus at this time? m/s 40.0 ) rad/s m)(50.0 8 . ( 2 2 tan = = = α r a 2. What is the centripetal component of the acceleration of the discus at this time? m/s 80.0 rad/s) m)(10.0 8 . ( 2 2 2 = = = ω r a rad 3. What is the magnitude of the acceleration? m/s 89.4 2 2 tan 2 = + = a a a rad Physics 125 Discussion #15 Solution 2 Problem 2: An electric ceiling fan An electric ceiling fan with blades 0.750 m in diameter is rotating about a fixed axis with an initial angular velocity of 0.250 rev/s. The angular acceleration is 0.900 rev/s 2 . 1. First, list all the known factors....
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 Fall '08
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 Acceleration, Angular Acceleration, Physical quantities, m/s

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