$1-79.$ The soft$-$ride suspension system of the mountain bike

is pinned at $C$ and supported by the shock absorber $BD.$ If it is

designed to support a load of $P=1500N,$ determine the

factor of safety of pins $B$ and $C$ against failure if they are made

of a material having a shear failure stress of ${}_{\text{f}\text{a}\text{i}\text{l}}=150$MPa.

Pin $B$ has a diameter of $7\mathrm{.}5$ mm $,$ and $nC$ has a diameter of

$6\mathrm{.}5$ mm $.$ Both pins are subjected to double shear.

Probs. $1-78/79$