2048_Spring08_Exam2 - 77777 Instructor(s): Field/Hirschfeld...

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77777 77777 Instructor(s): Field/Hirschfeld PHYSICS DEPARTMENT PHY 2048 Exam 2 March 19, 2008 Name (print, last frst): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE. (1) Code your test number on your answer sheet (use lines 76–80 on the answer sheet for the 5-digit number) . Code your name on your answer sheet. DARKEN CIRCLES COMPLETELY .CodeyourUFIDnumberonyour answer sheet. (2) Print your name on this sheet and sign it also. (3) Do all scratch work anywhere on this exam that you like. Circle your answers on the test form. At the end o± the test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout. (4) Blacken the circle of your intended answer completely, using a #2 pencil or blue or black ink .D on o t make any stray marks or some answers may be counted as incorrect. (5) The answers are rounded o². Choose the closest to exact. There is no penalty ±or guessing. (6) Hand in the answer sheet separately. Where needed use g =9
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77777 77777 1. A 8000-N car is traveling at 12 m/s along a horizontal road when the brakes are applied. The car skids to a stop in 4.0 s. How much kinetic energy does the car lose in this time? (1) 5 . 9 × 10 4 J (2) 4 . 8 × 10 4 J (3) 1 . 2 × 10 5 J (4) 5 . 8 × 10 5 J (5) 4 . 8 × 10 6 J 2. An object is constrained by a cord to move in a circular path of radius 0.5m on a horizontal frictionless surface. The cord will break if its tension exceeds 16N. The maximum kinetic energy of the object can have is: (1) 4 J (2) 8 J (3) 16 J (4) 32 J (5) 64 J 3. A 0.50-kg object moves in a horizontal circular track with a radius of 2.5 m. An external force of 3.0 N, always tangent
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This note was uploaded on 01/25/2011 for the course PHY 2048 taught by Professor Field during the Summer '08 term at University of Florida.

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2048_Spring08_Exam2 - 77777 Instructor(s): Field/Hirschfeld...

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