Two horizontal forces $P=10kN$ are applied to pin $B$ of the assembly shown in the figure blew,

Knowing that a pin of $20mm$ diameter is used at each connection.

A$)$ Determine the member force

$-$FAB and FBC

B$)$ Determine the maximum value of the average normal stresses in link AB and in link BC

C$)$ Determine the average shearing stresses in the pin t A$,$ B and C

D$)$ Determin the average bearing stresses at: $-$A in member AB

$-$ at B in member BC

$-$ at C in member BC