Can someone confirm my answers on a few torsion problems?

[EastWindBreaks]

Homework Statement

Homework Equations

The Attempt at a Solution

I feel I did something wrong, but not sure where is my problem. I don't feel conformable on number 26 and 27 and 29, can someone please tell me which answer is incorrect and any tip on solving it would be greatly appreciated!

 

[PhanthomJay]

Homework Statement

View attachment 204067

Homework Equations

The Attempt at a Solution

View attachment 204070
I feel I did something wrong, but not sure where is my problem. I don't feel conformable on number 26 and 27 and 29, can someone please tell me which answer is incorrect and any tip on solving it would be greatly appreciated!

Well you better start feeling comfortable because you got them all correct! Nice work.

 

[EastWindBreaks]

Well you better start feeling comfortable because you got them all correct! Nice work.

wow, I was expecting at least one incorrect answer, thank you for checking my work!