PROBLEM $1\mathrm{.}39$

Link $BC$ is $6$ mm thick and is made of a steel with a $450-$MPa ultimate strength in

tension. What should be its width $w$ if the structure shown is being designed to

support a $20-kN$ load $P$ with a factor of safety of $3?$

PROBLEM $1\mathrm{.}54$

Solve Prob. $1\mathrm{.}53,$ assuming that the pins

by pins with a $30-mm$ diameter.

PROBLEM $1\mathrm{.}53$ Each of the two verti

horizontal members $AD$ and $EG$ has a $1$

cross section and is made of a steel with

$400$ MPa $,$ while each of the pins at $C$ a:

are made of a steel with an ultimate

Determine the overall factor of safety

connecting them to the horizontal membe