PracticeTest1Solution-EP1-S07 - Engineering Physics 1...

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15 Engineering Physics 1 (Phys. 213) Practice Exam 1 SOLUTION, Feb. 8 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 See practice exam for equation sheet
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16 3. A car travels on a straight road for 20 km at 40 km/h. It then continues in the same direction for 1.0 hours at 60 km/h. What is the average velocity of the car during the complete trip? (Assume that it moves in the positive x direction.) Δ t 1 = Δ x 1 /v 1 Δ x 2 = v 2 Δ t 2 = (20 km)/(40 km/h) = 0.5 h = (60 km)(1 h) = 60 km Since both displacements are in the same direction, Δ x = Δ x 1 + Δ x 2 = 20 km + 60 km = 80 km. The total time for the trip is Δ t = Δ t 1 + Δ t 2 = 1.5 h. Therefore the average velocity is v avg = Δ x/ Δ t = (80 km)/(1.5 h) = 53 km/h b) The car now travels on a straight road for 20 km at 40 km/h. It then travels in the opposite direction for 1.0 hours at 60 km/h. Is the average velocity
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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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PracticeTest1Solution-EP1-S07 - Engineering Physics 1...

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