Answer
$M_{F1}=-3000\:lb.ft.$
$M_{F2}=-5600\:lb.ft.$
$M_{F1}=-2593\:lb.ft.$
Work Step by Step
Counterclockwise is positive.
For F1;
$M_{F1}=-375\:lb\:(8\:ft)=-3000\:lb.ft.\;or\;3000\:lb.ft.\;clockwise$
For F2;
$M_{F2}=-500\:lb(\frac{4}{5})\:(14\:ft)=-5600\:lb.ft.\;or\;5600\:lb.ft.\;clockwise$
For F3;
$M_{F2}=-160\:lb(cos\:30)\:(19\:ft)+160\:lb(sin\:30)\:(0.5\:ft)=-2593\:lb.ft.\;or\;2593\:lb.ft.\;clockwise$
