Need help with these.

A solid circular post supports a load P$1$ acting at the top, and a second load P$2$ uniformly distributed around the shelf at $B.$ Use" $P1=2500lb,d_{AB}=1\mathrm{.}25in,d_{BC}=2\mathrm{.}25in.$ a$)$ Calculate the normal stress in the upper section of the post $AB.$ b$)$ If it is desired to have the same compressive stress in the lower part as the upper part $($as found in part $($a$)),$ what should be the magnitude of load P$2?$

$($ANS: $2040$ psi, $5600$ Ib $)$

$5.$ A steel rod $100$ ft long holds a $200$ lb weight as shown. If the diameter of the circular rod is $\frac{1}{4}$ inch, find the maximum normal stress in the road, taking into account the weight of the rod itself. Use: density of steel $==490l\frac{b}{f}{t}^3.($ANS: $4450$ psi$)$