Exam1_2010_Fall

Exam1_2010_Fall - Physics 140 Fall 2010 First Midterm Exam...

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Physics 140, Fall 2010, Midterm 1 Problem 1: A cube of edge length a is positioned with one of its corners at the origin of the Cartesian coordinate system as shown. What is the angle θ between the body diagonal (line OA) and the face diagonal (line OB)? Problem 2: In a video game, a soccer ball’s trajectory on the screen is described in pixel units as ( 29 ( 29 2 3 2 3 25 2 3 4 12 3 5 r t t t i t t t j = - + - + + - + % % % . What is the magnitude of the ball’s acceleration at time t= 2.0 s? A. 73.8 0 B. 65.9 0 C. 60.0 0 D. 48.2 0 E. 35.3 0 a a a B A O z x y θ A. 76.4 pixel/s 2 B. 68.4 pixel/s 2 C. 62.1 pixel/s 2 D. 53.7 pixel/s 2 E. 44.6 pixel/s 2
Physics 140, Fall 2010, Midterm 1 Problem 3: A rabbit is chased by a fox and attempting to escape maintains a constant speed as it traces the path shown from A to C. Which of the arrows best represent the velocity and acceleration of the rabbit at point B ? Problem 4: You are on the roof of the Dennison Building, 49 m above the ground. Your physics professor, who is 1.80 m tall, is walking alongside the building at a constant speed of 1.6 m/s. If you wish to drop a rotten tomato on your professor’s head, where should the professor be from the point directly below you when you release the tomato?

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Exam1_2010_Fall - Physics 140 Fall 2010 First Midterm Exam...

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