PracticeExam4Solution-EP1-S08

PracticeExam4Solution-EP1-S08 - Engineering Physics 1...

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15 Engineering Physics 1 (Phys. 213) Practice Exam 4 (solution), Apr. 4 th , 2008 (O’Shea) Name __________________________________ Instructions: Please Read! This is a closed book, closed notes exam. This exam contains multiple-choice questions and problems. For each multiple-choice question, circle the letter of the best response. For problems, you need to show your work in a professional manner and write the final numerical answer with the proper unit in the space shown. Numerical answers without supporting calculations will receive zero credit. Partial credit is available only if your work is clear. 1. Academic honesty statement. This exam will NOT be marked unless you sign the academic honesty statement below. Your signature indicates that you have read , understood , and complied with the meaning of this statement. On my honor as a student I have neither given nor received unauthorized aid on this assignment. Sign your name:__________________________________________________________ 2. (1 point) Circle your Studio instructor/hour: Lynch /TU 9:30 Matloob /TU 11:30 Regehr /TU 1:30 O’Shea/WF 7:30 Lynch /WF 9:30 Page total: /1
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16 3. The speed v versus time t for a 0.500 kg object of radius 6.00 cm that rolls smoothly down a 30° ramp is shown. a) What is the linear acceleration? 2 m/s 5 . 3 1 / 5 . 3 / = = Δ Δ = t v a b) What distance the does the object roll during the time interval 0 – 1 seconds? m 1.75 2 / 2 2 2 2 = = = a v d ad v v f i f c) What is the rotational inertia of the object? Let θ = 30º, M = 0.50 kg and R = 0.060 m. The final velocity v f = v com = 3.5 m/s. () 2 kg.m 4 2 2 2 2 2 2 2 10 2 . 7 sin 2 0 sin 2 0 sin 0 0 2 1 2 1 0 × = = = + = + + = Δ + Δ com com com com com com v R v gd m I mgd R v I mv mgd I mv U K ω 4. A solid ball radius r = 1 cm is rolling at an initial speed of v i as shown If it just makes it around the loop, radius R = 1.4 m, what is the value of v i ? The ball rolls without slipping. r R g v F r R mv mg F v v mv R v mR mv I mv K f N f N f com com com com com = = = + = = + = + = 2 2 2 2 2 2 2 2 2 2 0 , / 10 7 5 2 2 1 2 1 2 1 2 1 set : y along forces Summing ball to law 2nd s Newton' apply loop of top at min find To ball rolling a For Conservation of energy: m/s 27 . 7 7 20 0 2 10 7
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This note was uploaded on 04/07/2008 for the course PHYS 213 taught by Professor Oshea during the Spring '08 term at Kansas State University.

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PracticeExam4Solution-EP1-S08 - Engineering Physics 1...

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