Common Final 161

Common Final 161 - Name(printed Fall 2009 Physics 161...

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__________________________________________ _______________ Name (printed) Section # University of Maryland Department of Physics Fall 2009 Hammer Physics 161 May 15, 2009 Final exam Answer all questions on these sheets. Please write clearly and neatly; we can only give you credit for we can read. The first 8 questions are multiple choice. There’s no partial credit for these – just choose the best answer and indicate it clearly. The second set are “short answer,” and they all require explanations, whether the word “explain” appears in the question or not! You’ll get no credit, even if your answer is correct, if we can’t follow your reasoning. Your explanation may be in words, mathematics, and/or diagrams. Full credit is for a correct answer with a clear explanation. You’ll get partial credit for sensible reasoning, even if the answer is incorrect. Please: Think about the physics, not about the psychology of how I we write exams! At the end of the exam, rewrite and sign the pledge: I pledge on my honor that I have not given or received any unauthorized assistance on this examination. ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ __________________________________________ Signature and date
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Final exam Name ___________________________________________ Section_____________Page 2 of 9 Multiple choice questions (5 points each) Just the answer counts for these; no partial credit. 1). You’re pushing a cart to get it moving. The cart starts from rest ( v = 0 ), and for a while you push it so that it moves to the right in a straight line with a steadily increasing speed: Every second, the speed of the cart goes up by 1 km/hour. Assuming friction is small enough to ignore, which of these could be a graph of the force you exert on the cart? (Write your answer in the box to the left.) 2). The clumsy professor rolls a heavy ball and a light ball along a table but doesn’t manage to stop them before they roll off. One ball weighs twice as much as the other; the lighter ball happens to roll at twice the speed. Each hits the floor at some horizontal distance from the table —how do those distances compare? (Write your answer in the box to the right.) A. The heavier ball will hit at about a fourth the distance from the table as the lighter ball. B.
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Common Final 161 - Name(printed Fall 2009 Physics 161...

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