$3.$ Internal loading $(27)$

$($a$)$ List the steps for calculating internal loading at point $\backslash ($ B $\backslash )$ in the beam above. $(8)$

$($b$)$ What is the sign of the normal force at point $\backslash ($ B $\backslash )?(5)$

$($c$)$ Describe the sign conventions for internal loading: what condition corresponds to positive or negative values of $\backslash ($ N$,$ V $\backslash )$ and $\backslash ($ M $\backslash )?(6)$

$($d$)$ Are the values of normal and shear forces, and moment, different if you calculate the loading from the left part or right part of the beam? Briefly explain. $(8)$