P150_Exam2_F06 - Physics 151 November 6 2006 Exam#2 Name...

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Physics 151 Name______________________________ November 6, 2006 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.______ A car of mass m travels a distance d up a hill, ending a vertical distance h above the starting point. The work done by the gravitational force of the Earth on the car during the trip is (A) mgd. (B) -mgd (C) mgh . (D) -mgh . (E) mg(d+h). 2.______ For which of the following situations is negative work done on a block? 3.______ A block of mass m starts from rest and slides a distance d down a frictionless incline that makes an angle θ with the horizontal. At the end of the slide the kinetic energy of the block is (A) mgd sin θ . (B) mgd cos θ . (C) mgd tan θ . (D) mgd/sin θ . (E) mgd/cos θ . 4.______ A crate slides across a level floor. The frictional force of the floor on the crate
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