P150_Exam3_F07 - Physics 150 December 3, 2007 Exam #3 Name_...

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Physics 150 Name______________________________ December 3, 2007 Exam #3 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. Record your multiple choice answers with the clicker system. 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. Also record your answers with your clicker. 1._____ The orbital speed for a satellite in orbit about a planet depends on (A) the mass of the planet. (B) the radius of the planet. (C) the mass of the satellite. (D) Both (A) and (B). (E) All of (A), (B) and (C). 2.______ A 80 kg child sits at one end of a 8 m very light seesaw and a 120 kg teenager sits at the other end. How far from the teenager should the pivot be placed so the seesaw is in equilibrium? (A) 3.0 m . (B) 3.2 m. (C) 4.0 m . (D) 4.2 m. (E) 4.8 m . 3.______ When two uniform spheres are a distance r apart the gravitational force on the other is F . When their separation is decreased to r/2 the magnitude of the gravitational force is (A) F/4 . (B) F/2 . (C) F . (D) 2F . (E) 4F . 4.______ When two particles are far apart their gravitational potential energy is zero; when they are separated by a distance d their gravitational potential energy is U . When they are separated by a distance of 2d their gravitational potential energy is (A) U/4 . (B) U/2 . (C) U. (D) 2U. (E) 4U . 5.______ If an object obeys the conditions for rotational equilibrium (A) no part of it is moving. (B) its center of mass is not moving. (C)
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P150_Exam3_F07 - Physics 150 December 3, 2007 Exam #3 Name_...

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