quiz9 - Answers for Quiz 9 A 1) B 2) A 3) B 4) A 5) C 6) A...

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Unformatted text preview: Answers for Quiz 9 A 1) B 2) A 3) B 4) A 5) C 6) A 7) A B 1) A 2) B 3) A 4) C 5) C 6) C 7) B C 1) B 2) A 3) B 4) B 5) C 6) D 7) C D 1) A 2) C 3) B 4) E 5) D 6) B 7) D E 1) B 2) A 3) B 4) B 5) E 6) B 7) B F 1) C 2) C 3) B 4) D 5) B 6) D 7) B G 1) B 2) B 3) A 4) B 5) E 6) A 7) D H 1) A 2) B 3) D 4) B 5) D 6) B 7) C I 1) B 2) A 3) B 4) C 5) A 6) E 7) A J 1) D 2) B 3) D 4) E 5) D 6) A 7) D K 1) C 2) C 3) C 4) B 5) E 6) A 7) D L 1) A 2) B 3) E 4) A 5) E 6) B 7) B UCSD Physics 2A Winter 2008 Instructor : Vivek Sharma Quiz Nine INSTRUCTIONS: Fill, tear and return the bottom strip of the front page with your scantron. Seperately, return back rest of the exam sheets. Use a #2 pencil to fill your scantron. Write your code number and bubble it in under ""EXAM NUMBER"". Bubble in the quiz version (see letter A--L at bottom of page) in your scantron under ""TEST VERSION"". Since Scantron accepts only letter A-D, those with exam versions E-H or I-L should enter corresponding letter from A-D in their scantron card. Ask the proctor if you need clarification. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Figure B 1) In Fig. B are scale drawings of four flat objects, each of the same mass and uniform thickness. Which has the greatest moment of inertia when rotated about an axis perpendicular to the plane of the drawing? In each case the axis passes through point P. A) A B) B C) C D) D E) The moment of inertia is the same for all of these objects. 2 2) A bowling ball of mass M, radius R and moment of Inertia I = MR2 is released at floor level so that at release 5 it is moving horizontally with speed v=5.0m/s and is not rotating. The coefficient of kinetic friction between the ball and the floor is k=0.080. The time for which the ball skids on the floor (after which it begins rolling without slipping) is : A) 1.8 s B) insufficient information to answer question C) 3.6 s D) 12.6 s E) 6.3 s --------Tear here and submit strip along with the scantron card. Follow TA instructions------Name____________________________________________Code-Number___________________ Phys 2A Quiz Nine Test Version A1 UCSD Physics 2A Winter 2008 Instructor : Vivek Sharma Figure A 3) In Fig. A, two blocks, of masses 2 kg and 3 kg, are connected by a light string that passes over a pulley of moment of inertia 0.004 kg m2 and radius 5 cm. The coefficient of friction for the table top is 0.30. The blocks are released from rest. After the upper block has moved 0.6 m, its speed is: A) 3.19 m/s B) 1.40 m/s C) 5.44 m/s D) 1.95 m/s 4) E) 1.22 m/s A marble of radius 1.0 cm is released from rest. It rolls without slipping down the track on the left from a height of 0.5m. The marble then goes up a frictionless track on the right to height h 2 . The value of h2 is closest to: A) 0.36 m B) 0.5 m C) Can not compute h without knowledge of , the coefficient of friction on the left track D) 0.2 m E) Can not compute h without knowledge of M, mass of the marble Phys 2A Quiz Nine Test Version A2 UCSD Physics 2A Winter 2008 Instructor : Vivek Sharma 5) To get a flat, uniform cylindrical satellite spinning at the correct rate, engineers fire four tangential rockets as 1 shown above. If the satellite has a mass M of 3600 kg, a radius R of 4.0 m , moment of Inertia I = MR2 and the 2 rockets each add a mass of 250 kg, what is the required constant force of each rocket if the satellite is to reach 32 revolutions per minute (rpm ) in 5.0 minutes, starting from rest? A) 15 N B) 12 N C) 31 N D) 20 N E) 124 N 6) A cyclist accelerates from rest at a rate of 1.0 m/s 2 . How fast will a point at the top of the rim of the tire (diameter = 68 cm) be moving after 2.5s ? A) 5.0 m/s B) 2.5 m/s C) 10 m/s D) 68 m/s E) 2 m/s Phys 2A Quiz Nine Test Version A3 UCSD Physics 2A Winter 2008 Instructor : Vivek Sharma 7) What is the net torque about the center of mass , point C, on the 2.0m long uniform beam ? A) 17 N.m causing counter-clockwise rotation B) 17 N.m causing clockwise rotation C) 10 N.m causing counter-clockwise rotation D) 10 N.m causing clockwise rotation E) 62 N.m causing counter-clockwise rotation Phys 2A Quiz Nine Test Version A4 Answer Key Testname: Q9 1) 2) 3) 4) 5) 6) 7) B A B A C A A --------Tear here and submit strip along with the scantron card. Follow TA instructions------Name____________________________________________Code-Number___________________ Phys 2A Quiz Nine Test Version A5 ...
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