A
builder scales a wall using a 2-meter ladder as shown. He weighs
650 N stops one fourth of the way up the ladder.
The bottom of the ladder rests on a horizontal stone ledge and
leans against a vertical wall that is frictionless. The
ladder makes an angle of 36.87 degrees with the
horizontal. The ladder weighs 200N.
Find the normal and the frictional forces on the ladder at its
base.
Find the minimum coefficient of static friction needed to
prevent slipping at the base.