Lab Introduction to MATLAB

ENGR1121 – Computing Applications in Mechanical Engineering Lab Introduction to MATLAB Lab due: end of lab Total points: 20 Labs are to be individual work. You may use MATLAB Marina, MATLAB’s help, and your notes. Lab work will be graded during lab time and working results must be shown to the lab instructor by the end of the scheduled lab time. All MATLAB programs and functions must be completed and submitted in accordance with the Computing Assignment Format and the MATLAB Coding Style. Submit an electronic copy of your lab work to the appropriate Dropbox Folder in GSU’s Folio by the end of lab. No hard copy needed unless specifically requested by the instructor. Grading Each problem will be graded according to: program design (identifying inputs/givens, process, and outputs; algorithm) and program style (program comments, variable names, proper formatted input and output including units) 25%, and program correctness 75%. Lab Work Use the following naming scheme for your programs: yourlastnameballthrownup.m and so on. Use the following naming scheme for your folder and zip file: yourlastnamelab11 and so on. Format, format, format…is the key to proper programming! Use relevant descriptive texts along with the input and disp commands. 1. (4 points) After a hard work week, Kirk is driving to Helen, Georgia, for a tubing trip (to cool off). Kirk drives 200 miles north from his home to Timbuktu; he then turns right and travels 400 miles east to Helen. Write a MATLAB program (.m file) to compute the linear distance, d, from Kirk’s home to Helen, Georgia. Note: the linear distance is the distance of the direct path between the two cities, not the total distance Kirk drove. Execute (run) the above program using the green arrow run button on the editor dashboard. Execute (run) the above program directly from the command window using the file name. Check the formatting of the header by typing help filename on the command window. 2. (5 points) Write a MATLAB program that asks the user to input 5 numbers one at a time, calculates the average of the numbers and displays it. Useful MATLAB commands: input, disp, mean 3. (5 points) Write a MATLAB program that asks the user to input an angle and verifies the trigonometric identity: 𝑠𝑠𝑠𝑠𝑠𝑠∅2 + 𝑐𝑐𝑐𝑐𝑐𝑐∅2 = 1 4. (6 points) A ball is thrown straight up in the air with an initial speed of 25 m/s. Write a MATLAB program that determines a. the time tp it takes the ball to reach its highest point and b. the highest distance sp the ball reaches from the release point. Hint: The acceleration due to gravity is g = -9.8 m/s2 and useful formulae for projectile motion are: v= v0 + at and s = s0 + v0t + 12 at 2 . Use disp command to display the time tp and height sp appropriately. 1 Instructor: Dr. Priya Goeser