A curved bar ABC having a circular axis (radius r = 12 in.) is loaded by forces P= 400 lb (see figure). The cross section of the bar is rectangular with height h and thickness t.
If the allowable tensile stress in the bar is 12,000 psi and the height h= 1.25 in., what is the minimum required thickness tmin?
![466_a394594a-15fb-4d7d-90b7-308484b857e8.png](https://secure.tutorsglobe.com/CMSImages/466_a394594a-15fb-4d7d-90b7-308484b857e8.png)