ENGR 132 - QUIZ18

ENGR 132 - QUIZ18 - how much time the speed is over 2 m s...

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Click to edit Master subtitle style 4/24/11 ENGR 132 Wed/Fri 3:30-5:30
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4/24/11 Quiz 18 Write the code required to find the first peak on the plot below. t e t t t f 3 5 23 3 - + - = ) cos( ) ( 0 1 2 3 4 5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 Time (s) Velocity (m/s)
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4/24/11 Solution - Quiz 18 Notes: Need to use x as independent variable (no t’s!!) Need to flip the function (define y_neg) y='2+cos(5*x)*(x^2- 3)/exp(x)' y_neg=['-(' y ')'] xmin=fminbnd(y_neg,0,1) x=xmin y_min=eval(y) +2 +2 +2 +2 +2
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Click to edit Master subtitle style 4/24/11 ENGR 132 Tues/Thurs 9:30-11:30
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Unformatted text preview: how much time the speed is over 2 m/ s on the interval [0,1] t e t t t f 3 5 23 3-+-= ) cos( ) ( 1 2 3 4 5-1-0.5 0.5 1 1.5 2 2.5 3 3.5 Time (s) Velocity (m/s) 4/24/11 Solution - Quiz 18 Notes: Must subtract 2 from the original eqn Must have good initial guess for each zero y=‘-25+cos(5*x)*(x^2-3)/exp(x)' zero_1=fzero(y,0.1) zero_2=fzero(y,0.8) time_over_2=zero_2-zero_1 +3 +2 +2 +3...
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