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quiz6 - UCSD Physics 2A Fall 2008 Instructor Vivek Sharma...

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Unformatted text preview: UCSD Physics 2A Fall 2008 Instructor : Vivek Sharma Quiz Six INSTRUCTIONS: Enter your name and code # in the bottom strip of the first page. Return the entire set of exam sheets with your scantron . 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--H at bottom of page) in your scantron under ““ EXAM VERSION””. Since Scantron accepts only letter A-D, those with exam versions E-H 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. 1) A package of mass m is dropped vertically onto a horizontal conveyer belt whose speed v =1.5m/s, and the coefficient of kinetic friction between the package and the belt is 0.70. How far does the packet slide relative to the belt? A) 0.33m B) 0.16m C) 0.11m D) 0.27m E) 1.6m 2) A stuntman drives a car over the top of a hill, the crosssection of which can be approximated by a circle of radius R=250m. What is the greatest speed with which he can drive without the car leaving the road at the top of the hill? A) 49.5 m/s B) 99 .0 m/s C) 29 m/s D) 25 m/s E) 192 m/s 3) A small mass m =10kg rests on the rough, sloping side of a triangular block of mass M =100kg which itself rests on a horizontal frictionless table as shown in the figure below. The angle θ=30o. The coefficient of static friction is 0.25. What is the minimum horizontal force F applied to M that will cause the small mass m to start moving up the incline ? A) 776N B) 1042 N C) 1078 N D) 518N E) 2046N Name____________________________________________Code-Number___________________ Phys 2A Exam Version A‐1 UCSD Physics 2A Fall 2008 Instructor : Vivek Sharma 4) A ball is thrown upward into the air with a speed that is greater than its terminal speed. It lands at the place where it was thrown. During its flight the force of air resistance is the greatest: A) halfway up B) at the top of its trajectory C) halfway down D) just before it lands E) just after it is thrown 5) A 30.0 kg object has a drag force with a magnitude proportional to the square of its speed. The object falls with an acceleration 4.00 m/s 2 downward when it is falling downward at 70.0 m/s. What is its terminal velocity? A) 110 m/s B) 157 m/s C) 108 m/s D) 172 m/s E) 91.0 m/s 6) A tennis ball hangs from a string from the ceiling of an automobile. As the car accelerates forward, the string makes an angle θ with vertical. If the mass of the tennis ball were twice as great, the angle the string would make with vertical would be ____ ? E) 3 θ A) θ/2 B) θ/3 C) 2 θ D) θ 7) Two masses are connected by a string which goes over an ideal pulley as shown above. Block A has a mass of 3.00 kg and can slide along a rough plane inclined 30.0 ° to the horizontal. The coefficient of kinetic friction between block A and the plane is 0.400. Block B has a mass of 2.77 kg. What is the acceleration of the blocks? A) 0 m/s2 B) 1.96 m/s2 C) 0.392 m/s2 D) 5.35 m/s2 E) 3.12 m/s2 8) A 49 kg rock climber is climbing a ʺchimneyʺ as shown below. The coefficient of static friction between her shoes and the rock is 1.2; between her back and the rock is 0.80. She has reduced her push against the rock until her back and her shoes are on the verge of slipping. What is the magnitude of her push against the rock? B) 126 N C) 240 N D) 192 N E) 12.6 N A) 1260 N Phys 2A Exam Version A‐2 Quiz 6 Answer Key Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Version A Version B B D A B E E D C C B E C D E C A Version C Version D Version E Version F B E A B A E D C C C A A A D E D E A E D E A C E E B A D A D C C Version G Version H A D C B A B A B E C A A C C C B ...
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