PHYS-1100 Fall 2010 Exam 2 answer key

# PHYS-1100 Fall 2010 Exam 2 answer key - 1 A skateboarder...

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1. A skateboarder rides in a straight line along a smooth, level street at a steady speed of 7.0 m/s for 20 s, then encounters a rough patch of pavement 40 m long that takes him 15 seconds to skate over. What was his approximate average speed (magnitude of velocity) for the entire straight line skate? a) 4.7 m/s b) 6.0 m/s c) 5.5m/s * d) 5.1 m/s e) none of these are even approximately correct 2. The area under a certain graph gives information about the change in the velocity of a certain moving object. The slope of that graph does not yield particularly useful kinematic information. The graph is most likely a) x -component versus y -component of position b) position versus time c) velocity versus time * d) acceleration versus time e) none of these are even approximately correct 3. A moving particle is experiencing an acceleration whose magnitude is non-zero and constant, yet the speed (magnitude of velocity) of the particle is not changing. What can you say about the motion of this particle? *

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