Arc length with vector functions
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Lessons
- Finding the Arc Length
Determine the length of the vector function on the given interval:r(t)=<2+3t,t2,343t23>0≤t≤1
- Determine the length of the vector function on the given interval:
r(t)=(3+4t)i+(2t−3)j+(5−t)k2≤t≤3
- Finding the Arc Length Function
Determine the arc length function for the given vector functionr(t)=<2t,31t3,t2>
- Determine the arc length function for the given vector function
- Finding a Specific Point on a Curve
After traveling a distance of 2π, determine where we are on the vector function r(t)=<cost,sint,t>.
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Topic Notes
Notes:
Finding the Arc Length
Given a vector function r(t)=<f(t),g(t),h(t)>, we can find the arc length of it on the interval a≤t≤b by calculating:
Finding the Arc Length
Given a vector function r(t)=<f(t),g(t),h(t)>, we can find the arc length of it on the interval a≤t≤b by calculating:
L=∫ab∣∣r′(t)∣∣dt
Finding the Arc Length Function Again, given the vector function r(t)=<f(t),g(t),h(t)>, we can find the arc length function s(t) by calculating:s(t)=∫0t∣∣r′(u)∣∣du
Where s is the length or distance travelled on the curve in terms of t. We usually want to find this if we are looking for r(t(s)), which tells us where a point is located on the curve.2
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