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205M_test1_version2_S10_solutions

# 205M_test1_version2_S10_solutions - Answer Problems 1...

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Answer Problems 1 through 10 on the bubble sheet. Problem 1 (5 pts) An astronaut uses a stopwatch to time the motion of a rock in outer space. At time t = 5 . 0 seconds, the rock is position 10 , 7 , 4 m. At time time t = 12 . 0 seconds, the rock is at position 3 , 4 , 6 m. What is the average velocity of the rock from t = 5 . 0 seconds to t = 12 . 0 seconds? A. 1 . 86 , 1 . 57 , 0 . 29 m/s B. 2 . 60 , 2 . 20 , 0 . 40 m/s C. 1 . 08 , 0 . 92 , 0 . 17 m/s D. 3 . 50 , 1 . 50 , 5 . 00 m/s E. 0 . 43 , 0 . 57 , 0 . 86 m/s For problems 2, 3, and 4, choose the letter that corresponds to the appropriate graph of the x-component of velocity vs. time for a cart on a track. Problem 2 (5 pts) : The cart initially moves in the x direction and experiences a net force in the x direction. Problem 3 (5 pts) : The cart initially moves in the x direction and experiences a net force in the + x direction. Problem 4 (5 pts) : The cart initially moves in the + x direction and experiences a net force is in the + x direction, and 3

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For problems 5, 6, and 7, refer to the diagram below. A ball kicked into the air moves along the path shown above; it is at point A and then later at point B . Problem 5 (5 pts) : Which arrow best indicates the direction of the ball’s instantaneous velocity at point B ?
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