A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 3 years ago
Evaluate the line integral
zdx+xdy+xydz
where is the path of the helix r(t)=(2cost)i+(2sint)j+(1t)k on 0 less than t less than 2
anonymous
 3 years ago
Evaluate the line integral zdx+xdy+xydz where is the path of the helix r(t)=(2cost)i+(2sint)j+(1t)k on 0 less than t less than 2

This Question is Closed

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0make variable change to cyulindrical coordinates first with r=2

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0x=2cost y=2sint z=z so: dx=2sint*dt dy=2cost*dt dz=dz

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0i got to \[\int\limits_{0}^{2\pi} 2 tsintdt +4\cos^2tdt + 4costsintdt\] but i cant figure put how to integrate

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.1t is bound above by 2 or 2pi?

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.1first term: integrate by parts second term: double angle formula \(\cos^2t=\frac12(1+\cos(2t))\) third term: u=sin(t)

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.1that makes more sense obviously so did you try it yet?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0no the homework is not due till tonight so im studying for my test and will try it after!

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0i got 3 pi but it was incorrect.

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.1\[\int_0^{2\pi}2t\sin t+4\cos^2t+4\sin t\cos tdt\]\[2t\cos t2\sin t+2t+\sin(2t)+2\sin t_0^{2\pi}\]is that what you got?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0no my signs were messed up.

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.1let me check with wolfram...

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0thats correct! i finished it!

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0i had too many subtraction signs.

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.1cool :) yeah, the algebra can be the worst in calc 3

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0hahhaa. yeah. thanks so much. :)
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.