A 530-kg I-beam that is 4.6 m long has one end attached to a vertical wall. The I-beam is allowed to pivot up and down about the attachment location. A long cable is then attached to the other end of the I-beam and hoisted vertically so the I-beam is exactly parallel with the ground. The horizontal pin force at the pivot is
A) 5300 N.
B) 0 N.
C) 2600 N.
D) 4500 N.

Question

Quizplus · Accepted Answer

The horizontal pin force at the pivot is responsible for balancing horizontal forces. Since the only forces acting on the I-beam are vertical (its weight and the tension in the cable, both acting vertically), there is no horizontal component of force to balance. Therefore, the horizontal pin force is 0 N.

A 530-Kg I-Beam That Is 4