Question $17$

Classify the following truss as statically determinate $($SD$),$ statically indeterminate $($SI$),$ stable, or

unstable. If statically indeterminate, determine the degree of indeterminacy. If unstable, explain why.

$m+R-2J=$Answer for part Gap $1$

SD

SI

Unstable

Only when SI is selected, then answer SI $=$

o

Answer for part Gap $3$

Stable

Unstable, because there is an internal collapse mechanism

Unstable, because there are so many hinges in a row