physics 2.2

physics 2.2 - PH 105 Jones Review 2 for second exam Spring...

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PH 105 Review 2 for second exam Jones Spring 2008 1. A flywheel rotates at 50 rad/s. It is brought to rest by a constant frictional torque after making 10 complete revolutions. How long did it take to stop the flywheel? (a) 0.80 s (b) 50 s (c) 1.26 s (d) 2.5 s (e) 5.0 s 2. A 10 kg mass is hung from a pulley that is shaped like a hoop. The pulley has mass 5 kg and radius 0.15m. What is the acceleration of the 10 kg mass as it falls? (a) 9.8 m/s 2 (b) 52 m/s 2 (c) 6.5 m/s 2 (d) 7.8 m/s 2 (e) 3.3 m/s 2 3. A woman of mass 60 kg runs at a speed of 5 m/s towards a carousel and jumps onto it at the very edge. If the carousel has a mass of 1000 kg, a radius of 2m, and is shaped like a solid disk, what is the angular velocity of the carousel (with the woman on it) after she jumps on? The carousel rotates without friction. (a) 0.30 (b) 0.27 (c) 0.82 (d) 0.56 (e) 1.3 4. A disc rolls down an inclined plane of angle 30 o (see figure). What is the acceleration of the disc (in m/ s 2 )? 30
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This note was uploaded on 04/07/2008 for the course PH 105 taught by Professor Stanjones during the Spring '08 term at Alabama.

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physics 2.2 - PH 105 Jones Review 2 for second exam Spring...

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