PracticeExam1-2012spring-SOLUTIONS

# PracticeExam1-2012spring-SOLUTIONS - PHYS 172 Practice Exam...

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PHYS 172 Practice Exam 1 - SOLUTIONS 1) D 2) A 3) E 4) B 5) C 6) A 7) D 8) B 9) E 10) A 11) E (direction of C) is correct but the correct magnitude is twice as large)

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Tu W Th F 8.30 9:30 10:30 11:30 12:30 1:30 2:30 3:30 4:30 Mark your recitation time with an X PHYS 172 - Spring 2010 Hand-Graded part of Practice Exam 1 : Name (Print):________________________________ Signature:___________________________________ PUID:______________________________________ When you use a fundamental principle you must explain clearly what physical system you are applying it to and which objects in the system’s surroundings are interacting significantly with it. Problem 1 (20 points) You see your 10 kg bag sitting at rest on the floor at the airport baggage claim, and you rush over to grab it. You jerk the bag off the ground by pulling on it with a constant force of 130 N, at an angle of 70 ° above horizontal, for 0.1 seconds. The force of your pull is in the x-y plane (where the x-axis is parallel with the ground, and the y-axis points straight up in the air). We want to know the velocity of the bag at the end of this 0.1 second period of tugging, and also the total distance through which the bag moved. 1.1. Define the system you’re using in this problem. 1.2. List the external objects that interact significantly with the system. Make a carefully labeled diagram showing their interaction with the system. List an object that doesn’t interact
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