P150_Exam2_F07 - Physics 151 November 5, 2007 Exam #2 Name_...

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Physics 151 Name______________________________ November 5, 2007 Exam #2 Lab Section Number________________ Instructions: There are 20 multiple choice questions (worth 2 points each), and 3 work problems (worth a total of 60 points). You must answer all questions to receive full credit. You must show all equations and substitutions made to obtain your answers for the work problems. Write the final answers to the problems with their respective units in the spaces provided. Part I (40) Part II (60) Total (100)
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Part I: Short Answers Multiple Choice: Please write in the letter of the item that best answers the question. 1.______ An object moves in a circle at constant speed. The work done by the centripetal force is zero because (A) the displacement for each revolution is zero. (B) the average force for each revolution is zero. (C) there is no friction. (D) the magnitude of the acceleration is zero. (E) the centripetal force is perpendicular to the velocity. 2.______ A baseball is hit high into the bleachers in right field. Over its entire flight the work done by gravity and the work done by air resistance, respectively, are (A) positive and positive. (B) positive and negative. (C) negative and positive. (D) negative and negative. (E) Not enough information given to answer the question. 3.______ An object is constrained by a cord to move in a circular path of radius 0.5 m on a horizontal surface. The cord will break if the tension exceeds 16 N . The maximum kinetic energy the object can have is (A) 4 J . (B) 8 J . (C) 16 J. (D) 32 J. (E) 64 J . 4.______ The amount of work required to stop an object is equal to (A) the velocity of the object. (B) the kinetic energy of the object. (C) the momentum of the object. (D) the mass of the object times its acceleration. (E) the square of the velocity of the object. 5.______ The sum of the kinetic and potential energies of a system of objects is conserved (A) only when no external force acts on the system.
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P150_Exam2_F07 - Physics 151 November 5, 2007 Exam #2 Name_...

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