A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 5 years ago
let r(t)=(sint, cost,t) find k(t)
anonymous
 5 years ago
let r(t)=(sint, cost,t) find k(t)

This Question is Closed

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0k(t)=r'(t)xr''(t) / r'(t)^3

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0r'(t)= (cost,sint,1) r''(t)=(sint,cost,0) r'(t)= square root of 2

ash2326
 5 years ago
Best ResponseYou've already chosen the best response.0r'(t)r''(t)=(sint cost, sint cost, 0) r'(t)r''(t)=root(sin^2t cos^2t+sin^2t cos^2+0) r'(t)r''(t)=root(2 sint^2t cos^2t)=sint.cost root(2) r't^3=2root (2) k(t)=(sint*cos t)/2

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0mm,,, in the cross product i got (cost, sint,1)

mathmate
 5 years ago
Best ResponseYou've already chosen the best response.1r(t)=(sint, cost,t) find k(t) r'(t)=<cos(t),sin(t),1> r"(t)=<sin(t),cos(t),0> r'(t)xr"(t) = <cos(t),sin(t),1> r'(t)xr"(t) = sqrt(2) r'(t) = sqrt(2) r'(t)xr"(t) / r'(t)^3 = sqrt(2)/sqrt(2)^3 = 1/2

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yea thats what i have
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.