practice+midterm+2b

# practice+midterm+2b - Physics 140, Winter 2010 Second...

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Problem 1: The angular momentum of a system is constant when: A. the total kinetic energy is constant. B. no net external force acts on the system. C. the linear momentum and the energy are constant. D. no external torque acts on the system. E. the moment of inertia is constant. Problem 2: An electric fan is turned off, and its angular velocity decreases uniformly from 500 rev/min to 200 rev/min in 4.0 s. How many revolutions has the fan made during those 4.0 s? A. 11.7 revs B. 23.3 revs C. 43.6 revs D. 75.0 revs E. 116.5 revs
Problem 3: A graph in figure shows potential energy versus position for a particle moving in a straight line (along the x-axis). From this curve and for the region displayed, we deduce that: A.

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## This note was uploaded on 01/30/2012 for the course PHYS 140 taught by Professor Uher during the Winter '10 term at University of Michigan.

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practice+midterm+2b - Physics 140, Winter 2010 Second...

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