Hi

Need help on the following question:

A curve has vector equation Find its curvature K

i know that

This is what i have done.

This is where i am not sure what to do

how do you work out ???

P.S

Printable View

- October 27th 2010, 11:59 PMPaymemoneyFinding the Curvature K
Hi

Need help on the following question:

A curve has vector equation Find its curvature K

i know that

This is what i have done.

This is where i am not sure what to do

how do you work out ???

P.S - October 28th 2010, 12:10 AMSudharaka
Dear Paymemoney,

I hope the correct vector equation must be,

If you want to find the curvature first find ; where is the unit tangent vector.

Hope you could continue. - October 28th 2010, 12:48 AMPaymemoney
oh yeh, the first part i found the unit tangent so i get this:

what would i do next? - October 28th 2010, 12:58 AMSudharaka
Dear Paymemoney,

That is the answer. Since the denominator is positive, - October 28th 2010, 04:06 AMPaymemoney
the answer in the book is unless this is incorrect

- October 28th 2010, 04:46 AMSudharaka
- October 28th 2010, 04:31 PMPaymemoney
in relation to this question the book had an example on these types of question and i didn't understand how they got

to this:

Hence

why is the values inside 4+36&2+36^4? - October 28th 2010, 05:02 PMSudharaka
- October 28th 2010, 05:58 PMPaymemoney
- October 29th 2010, 02:48 AMSudharaka
- October 29th 2010, 01:56 PMPaymemoney
yep i understand now, but as for the original question i still cannot get the answer would you show me your solutions to it?

- October 29th 2010, 08:17 PMSudharaka