Prob. $3-22$

$3-23.$ The tower crane is used to hoist the $2-Mg$ load upward

at constant velocity. The $1\mathrm{.}5-Mg$ jib $BD,0\mathrm{.}5-Mg$ jib $BC,$ and

$6-Mg$ counterweight $C$ have centers of mass at $G_1,G_2,$ and $G_3.$

respectively. Determine the resultant moment produced by

the load and the weights of the tower crane jibs about point $A$

and about point $B.$

$*3-24.$ The tower crane is used to hoist a $2-$Mg load upward

at constant velocity. The $1\mathrm{.}5-Mg$ jib $BD$ and $0\mathrm{.}5-Mg$ jib $BC$

have centers of mass at $G_1$ and $G_2,$ respectively. Determine

the required mass of the counterweight $C$ so that the

resultant moment produced by the load and the weight of

the tower crane jibs about p int $A$ is zero. The center of mass

for the counterweight is located at $G_3.$

Probs. $3-23/24$