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# fall10_f - Dr Gundersen and Dr Galeazzi Signature Idnumber...

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Dr. Gundersen and Dr. Galeazzi Physics 205 Final Exam 11 December 2010 Signature: Name: 1 2 3 4 5 6 7 Idnumber: You must do the first two problems. Each of the first two problems consists of five multiple choice questions. Then you can skip one of the five long problems numbered 3-7. Clearly cross out the page and the numbered box of the problem omitted. Do not write in the other boxes. If you do all the problems, only problems 1-6 will be graded. Each problem is worth 25 points for a total of 150 points. A formula sheet is provided on the LAST 2 pages which you can tear off. TO GET PARTIAL CREDIT IN PROBLEMS 3 - 7 YOU MUST SHOW GOOD WORK. CHECK DISCUSSION SECTION ATTENDED: [ ] Dr. Galeazzi 1O, 9:30 - 10:20 a.m. [ ] Dr. Voss 1P, 11:00 - 11:50a.m. [ ] Dr. Huffenberger 1Q, 12:30 - 1:20 p.m. [ ] Dr. Barnes 1R, 2:00 - 2:50 p.m. [ ] Dr. Gundersen 1S, 3:30 - 4:20 p.m. [ ] Dr. Nepomechie 3O, 9:30 - 10:20 a.m. [ ] Dr. Voss 3Q, 12:30 - 1:20 p.m. Physics 205 Final Exam 11 December 2010

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Dr. Gundersen and Dr. Galeazzi Physics 205 Final Exam 11 December 2010 [1.] This problem has five multiple choice questions. Circle the best answer in each case. [1A.] Due to the residual drag of the atmosphere, a satellite in orbit around the Earth slowly moves closer to the Earth’s surface. Which of the following statements about the satellite is correct? [a] Both kinetic and potential energy increase. [b] The kinetic energy increases while the potential energy decreases. [c] The kinetic energy decreases while the potential energy increases. [d] Both kinetic and potential energy decrease. [e] Both kinetic and potential energy stay the same. [1B.] On a table of materials you find that, for rubber, Young’s modulus is Y = 2 × 10 5 Pa, while the proportional limit is 1 × 10 2 Pa. You start pulling on a 1 m long rubber band while measuring its length. Which of the following statements is correct? [a] It is impossible to determine in advance when you reach the proportional limit without knowing the cross-sectional area of the band. [b] It is impossible to determine in advance when you reach the proportional limit without knowing the force applied. [c] You will reach the proportional limit when the band is 1% longer. [d] It is impossible to determine in advance when you reach the proportional limit without knowing the force applied AND the cross-sectional area. [e] You will reach the proportional limit when the band is 0 . 05% longer. [1C.] A particle of mass m is subject to a force that changes with time as vector F ( t ) = αt ˆ i - βt 2 ˆ j , where α and β are positive constants. If the particle is initially at rest at the origin with zero intial velocity, how far is it from the origin at time t ? [a] t 3 m radicalbig α 2 + β 2 t 2 [b] t 3 6 m ( α - βt 2 ) [c] t 3 2 m radicalbigg α 2 + β 2 t 2 9 [d] t 3 m ( α + βt ) [e] t 3 6 m radicalbigg α 2 + β 2 t 2 4 [1D.] A solid cylinder with moment of inertia I = 1 2 MR 2 , a hollow cylinder with moment of inertia I = MR 2 and a solid sphere with moment of inertia I = 2 5 MR 2 all have a uniform density, the same mass and the same radius. They are placed at the top of an inclined plane and allowed to roll down the inclined plane without slipping. What order do they
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