1A) A 47.8 kg, 3.6 m uniform ladder leans against a frictionless
wall. A 87.7 kg person is standing on the ladder down 0.98 m from
the top of the ladder. The ladder makes an angle of 70 degrees with
the horizontal. What is the minimum coefficient of static friction
between the ladder and the ground so that the ladder does not
slip?
1B) A 198.3 kg uniform, horizontal beam is hinged at one end and
at the other is supported by a cable that is at 20 degrees to the
left of the vertical. The beam is 3.34 m long. Calculate the
direction of the force at the hinge (measured with respect to the
horizontal). Answer with a number in degrees.