h Simpson College WeBWorK Waggoner-Max I Told The Storm Greg 4I C Calculus quest
ID: 2849493 • Letter: H
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h Simpson College WeBWorK Waggoner-Max I Told The Storm Greg 4I C Calculus quest IChegg x e, e https:// Simpson.edu /webwork2/Waggoner-Math-251-Fall-2015/13.2DerivativesofVectorFunctions/3/ math. webwork Waggoner-math-251-fall-2015 13.2derivativesofvector functions MAIN MENU Courses Homework Sets 13.2DerivativesofVectorF 13.2DerivativesofVectorFunctions: Problem 3 Problem 3 Prev Up Next Password Email Grades Answer Preview Entered Achievements 0.0176721478460901 3202 Problems 1.99937529281625 V 1601 Problem 1 Problem 2 At least one of the answers above is NOT correct. Problem 3 Problem 4 (1 point) Problem 5 Find the unit tangent vector at the indicated point of the vector function r(t) lt i 20t j 18 k Problem 6 Problem 7 T (2) 1/sqrt(3202) 80/ sqrt(1601) Display options View equations as: Note: You can earn partial credit on this problem. Math Jax Preview Answers Submit Answers images Show saved answers? Your score was recorded Yes You have attempted this problem 5 times. No You received a score of 33% for this attemnt WA A A Y ABP ENG 7:37 PM 9 0/31/2015Explanation / Answer
r(t)=<1t,-20t2,-18>
r'(t)=<1,-40t,0>
r'(2)=<1,-80,0>
|r'(2)|=[(12)+(-80)2+02]=6401
unit tangent vector T(2)=r'(2)/|r'(2)| =<1,-80,0>/6401
T(2)=<1/6401 ,-80/6401 ,0>
T(2)=<0.012499,-0.999922 ,0 >
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