ENGR126_exam3_f07_formatted

# ENGR126_exam3_f07_formatted - ENGINEERING 126 Fall 2007...

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ENGINEERING 126 Fall 2007 Written Exam 3 Name: __________________________________ Student ID: _______________________________ Division/Section:___________________________ INSTRUCTIONS: Duration: 60 minutes Keep your eyes on your own work! Keep your work covered at all times! 1. Each student is responsible for following directions. Read carefully. 2. Excel and MATLAB commands, and Statistics equations are provided on the next page. 3. This exam consists of 6 pages (3 sheets front AND back). Check to be sure that you have all of the pages. 4. Write you name on the answer sheet . 5. Closed book and notes. 6. No calculators. 7. Please make sure you return the answer sheet .

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ENGR 126 – Fall 2007 EXAM III – Formula Sheet for Written Exam Statistics Equations = - - = n i i x x n s 1 2 2 ) ( 1 1 ( 29 1 1 2 1 2 2 - - = = = n n x x n s n i n i i i Linear Regression = = = + n i i n i i y bn x a 1 1 = = = = + n i i i n i i n i i y x x b x a 1 1 1 2 = - = n i i i x f y SSE 1 2 )] ( [ = - = n i i y y SST 1 2 ] [ SST SSE r - = 1 2 MATLAB Commands + - * / ^ = .* ./ .^ % ' : ; < > <= >= ~ ~= = = & | [ ] ... abs acos all asin atan ans any axis bar break clc clear cos csc diff disp else elseif end eval exit exp factorial figure find fminbnd for format fplot fprintf function fzero grid help hist hold i, j if image imread Inf input legend length linspace load log log10 loglog logspace lookfor max mean median min NaN ones pi plot polyfit polyval prod quit rand reshape round sec semilogx semilogy sin size sort sqrt std subplot sum tan text title while who whos xlabel xor ylabel zeros Excel Functions + - * / ^ = \$ ABS AVERAGE COS EXP LN LOG10 MAX MEDIAN MIN MODE PI() SIN SQRT STDEV SUM TAN
ENGR 126 Exam 3 November 19, 2007 Problem #1 (14 points) An important dimensionless number in fluid mechanics is the Reynolds number, Re , given by μ ρ L v Re = , where ρ is fluid density (kg/m 3 ), v is fluid velocity (m/s), L is a length (m), and μ is fluid viscosity (Nsm -2 ).

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