ENGR $220$

Exam $3$

Fall $2024$

A ladder is sliding down a brick wall, and during the fall one end remains in contact with the wall and one with the ground. At the instant defined by angle theta $($shown in the diagram$),$ point B has a downward acceleration of a$\_($B$)$ and a downward velocity of v$\_($B$).$

Calculate:

Calculate the angular acceleration of the ladder $[$rad$/\{$:sec$^(2)].$ Use the sign convention of a positive alpha being in the counterclockwise direction.

Solve Problem $1$ from Exam $3$ using the following values:

L $=5[$m$]$

aB $=3\mathrm{.}5[$m$/$s$^2]$

vB $=4[$m$/$s$]$

Theta $=50[$degrees$]$

Calculate the angular acceleration $[$rad$/$sec$^2]$ of the ladder. Counterclockwise acceleration is a positive number. Report your answer to three significant figures. PLEASE EXPLAIN AS WELL