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sample-exam2-s03

# sample-exam2-s03 - ENGR 160 Exam 2 Spring'03 Name Section...

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ENGR 160 Exam 2 Name Section # Spring '03 ENGR. PROBLEMS /50 PROGRAMMING /50 TOTAL: /100 DIRECTIONS: The reference sheet plus one extra page of notes may be consulted during the exam. Print your name on all pages. Express all answers with proper significant digits unless directed otherwise. Engineering Problems: 1. (15%) A group of machine parts, made of several components, were tested repetitively under a variety of loads until they failed. The following data indicate the loads and the number of cycles until failure occurred. Load (lb f ) N (cycles to failure) 1.0 x 10 1 4.10 x 10 6 2.0 x 10 1 1.96 x 10 6 3.0 x 10 1 1.00 x 10 6 4.0 x 10 1 5.14 x 10 5 Given that the data form a straight line (or close to one) on semi-log graph paper, use the method of least squares (for an exponential equation) to determine the equation relating cycles to failure as a function of load. Show all your work and give your answer using the appropriate variables in the equation. YOU DO NOT NEED TO GRAPH THE DATA.

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ENGR 160 Exam 2 Spring ‘03 Page 2 2. (25%) The beam (AB) shown below is in static equilibrium and has a uniform linear mass of 1.25
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