Discussion on: Solution to Problem 115 Shear Stress

Following is a discussion on the Reviewer item titled: Solution to Problem 115 Shear Stress. Feel free to add your own comments!

why is that the area of pi(r)squared all over 4 are not use in this problem?thanks

In reply to by VG Icalina

cause, only the out surface of the punch have shear stress. I think so LOL

How did thry use thr height , I mean why pie inti 20 into 25, is it r e rectangle formula