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UMD PHYS 117 - Exam II

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~,...~~,!~~Exam II: Physics 117 F04October 27, 2004James J. GriffinPhysics 2109rrel.30l-405-6118Page 1 of 13 (Twelve pages of exam follow .)Physics 117 Exam II, Cover PageA) GENERAL INSTRUCTIONSThis exam consists of 60 questions worth:two points each for a maximum of 120 pointsALL ANSWERS MUST BE ENTERED iNTo THE NCS ANSWER SHEET BY MEANSOF REA VY BLACK MARKS WITH A NUMBER 2 PENCIL. (Only a pencil mark willwork; the optical scanner cannot read inked answers no matter what color or how dark.)The questions are numbered from 1 to 60: make sure you enter your single letter answer intothe answer line with the same number as the question you are answering.Only the computer readable NCS answer sheet will be handed in. Keep this exam for youfuture use.**********B) PREPARE YOUR ANSWER SHEET IN ADVANCE:I) SIGN YOUR PERSONAL SIGNATURE INTO THE TOP MARGIN ABOVE THENAME BOX. .2) PRINT YOUR NAME, F AMIL y NAME FIRST , INTO THE BOXES PROVIDEDAND DARKEN THE CIRCLE FOR THE CORRESPONDING LE1TER BELOWEACH BOX3) INSERT YOUR STUDENT ID NUMBER ~ER"IDENTIFICATIONNUMBER" AND DARKEN THE CORRESPONJ)ING CIRCLES BELOW.EACHNuMBER.4) MAKE NO STRA Y MARKS ON THE ANSWER SHEET AND ERASECLEANLY IF NECESSARY.**********C) GENERAL ADVICEMany students will not have time to finish this exam if they proceed at a leisurely pace.Therefore it is probably advantageous to eannark time-consuming it~ms for later attentionand skip forward to questions that can be answered more easily. No subtractions will be madefor wrong answers, so that last minute best guessing is probably an advantageous strategy.IF YOu NEED HELP, ASK! AND ASK EARLY RATHER THAN LATE.' :::..::::..:--: :.:~~ ;;:.:.ALSO FqR FAIRNESS' SAKE, PLEASE STOP WRITING WHEN nrn EXAM ENDS. APENALTY OF 8% OF THE RAW SCORE MAYBE IMPOSED UPON STUDENfS WHOTRY TO TAKE UNFAIR ADVANTAGE OF THE COLLECfION PROCESS BYCONfINl!1NG TO WRITE AFTER THE END HAS BEEN ANNOUNCED....IIIf8(A111LPage 2 of 13Multiple ChoiceInsert into your NCS answer sheet the letter of the single choice which best answers the question.I. Which of the following statements about the moon is most correct?a. The moon has a non-constant velocity.b. There is a net force acting on the moon due to the sun, the earth and the other planets.c. The earth exerts an equally strong force on the moon as the moon exerts on the earth.d. The moon experiences a centripetal acceleration toward the earth.e. All of the above statements abut the moon are true.2. Which of the following statements about the moon is !!Q! correct?a. The acceleration due to gravity on the moon is weaker than on the earth.b. The earth's gravitational pull on the moon equals the moon's gravitational pull on earth.c. There is a net force acting on the moon.d. The moon is not accelerating.e. The moon' s rotation about the earth causes high tide to come later on successive days.3.An astronaut weighs 900 N when measured on the surface of the earth. How large would theforce of gravity on him be if he were in an earth satellite at an altitude equal to the earth's radius?a. 225 Nbo 450 Nc. 900 Ndo 3600 Ne. None of the above is correct within 10%If you triple the length of each side of a cube, its surface area increases by what factor?a. 3b. 6c. 9d. 12e. 184.A future space traveler, Skip Parsec, lands on the planet MSU3, which has twice the mass ofEarth and twice its radius. If Skip weighs 400 Newtons on Earth's surface, how much does heweigh on MSU3's surface?a. 1600 Nb. 800 Nc. 400 Nd. 200 Ne. 100N5.What is the magnitude of the earth's gravitational field at a distance equal to four times theearth's radius?a. 40 N/kgb. 20 N/kgc. 10 N/kgd. 2.5 N/kge. 0.62 N/kg6.Page 3 of 137During the Apollo flights to the moon a well-known TV newscaster made the following statement,"The Apollo space craft is now leaving the gravitational force of the earth." This statement isincorrect. He should have said that the space crafta. was now being attracted only by the moon.b. was now being attracted only by the sunc. was now attracted more by the sun than by the earth.d. was now in a region of space where there no gravitational forces act upon it.e. Was now being attracted more strongly by the moon than by the earth.8.The numerical value of G, the gravitational constant, was determineda. from knowledge of the earth's mass density and volumeb. from the law of universal gravitation and the value of the acceleration due to gravity.c. from the value of the moon' s acceleration.d. by measuring the force between masses in the laboratory .e. From a very precise knowledge of the mass of the earth.9. Which of the following would !!Q! cause the gravitational force on an object near the surface of10.fu an orbiting satellite such as SkyLab , physical objectsa. have mass but no weight.b. have mass but no force due to gravity.c. have neither mass nor weight.d. fall to the floor with an acceleration of 9.5 mIsts.e conform to al of the above statements.11Geosynchronous communications satellites orbit the earth eacha. 90 minutesb. 24 hoursc. 28 daysd. 1 yeare. They don't orbit the earth; they just stay in one place.12.Because the moon rotates about the earth about once every 28.3 days, there will occur on earthduring some, but not most, 24 hour intervals,a. one high tide and one low tide;b. one high tide and two low tides, or two high tides and one low tide;c. two high tides and three low tides, or three high tides and two low tides.d. two high tides and two low tides.e. All of the above combinations occur in some, but not most, 24 hour intervalsthe earth to increase ?a. an ore deposit just under the surfaceb. a lower elevationc. an increase in its massd. a horizontal velocitye. All of he above would cause an increase in the gravitational force on the object.Page 4 of 1313. Which of the following is true of the momenta of an 18-wheeler parked at the curband a Volkswagen rolling down a hill?a. The 18-wheeler has the greater momentumb. The Volkswagen has the smaller momentumc. Their momenta are equal.d. Either could have the greater momentum.e. None of the above14. How fast would you have to throw a baseball (m = 145 g) to give it the same momentum as a 5-gis15. Newton's


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UMD PHYS 117 - Exam II

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