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? 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.

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