Exam_Final_Key_F07

Exam_Final_Key_F07 - Final Exam Physics 172H fall 2007...

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Final Exam Physics 172H fall 2007 Purdue University GRADING: Each multiple choice problem was awarded 8 points. In some cases, partial credit of 4 points was given (see answers below) Print your name____________________________________TA Name_______________ Do not use other paper. Write on the back of this test if needed. All problems except the last one are multiple-choice and only the correct answer is graded. For the last problem only you must provide the complete reasoning and solution as requested in the problem: Correct answers without adequate explanations or with incorrect reasoning will be counted wrong. Cross out anything you don’t want us to read. Make explanations complete, but brief. Do not write a lot of prose. Include diagrams where appropriate to explain your work. Show what goes into a calculation, not just the final number: (2m)/(4 s) = 0.5 m/s Give standard SI units with your results Unless specifically asked to derive a result, you may start from the formulae give on the equation sheet. All equations used must be derived from those on the equation sheet. Use correct vector notation. Your work must be legible and clear.
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Problems 1 and 2: 1. In outer space, a rod is pushed to the right for a long time by a constant force F . Compare the density of atoms in the rod at locations A, B, and C. 1) The density of atoms at A is greater than at B which is greater than at C (A>B>C) 2) The density of atoms at C is greater than at B which is greater than at A (C>B>A) 3) The density of atoms at B is greater than at C which is greater than at A (B>C>A) 4) The density is the same at A, B and C (A=B=C) 5) The density is changing while the constant force is applied so the relative densities are not determinable. 6) None of the above 2. After the rod in the previous problem reaches a speed v , the object that had been exerting the force on the rod is removed. Compare the density of atoms in the rod at locations A, B, and C. 1) The density of atoms at A is greater than at B which is greater than at C (A>B>C) 2) The density of atoms at C is greater than at B which is greater than at A (C>B>A) 3) The density of atoms at B is greater than at C which is greater than at A (B>C>A) 4) The density is the same at A, B and C (A=B=C) 5) Jacob is an awesome TA (making choice 6 incorrect) 6) None of the above A B C F
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An object of mass m travels in circular path of radius r at a constant speed v . Find the work done on the object as it travels from position A to position B pictured below. 1) r mv 2 2) mvr 3) ) ( 2 mv π 4) 0 J 5) 2 2 mv 6) None of the above 4. Block A has 3 oscillators and 5 quanta is placed into contact with a block B of 6 oscillators and 1 quanta. After a long time has elapsed, how many quanta, on average, are found in block A ? 1)
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Exam_Final_Key_F07 - Final Exam Physics 172H fall 2007...

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