Answered: 11ft 3ft 4ft Tips: Neglect the weight…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

A 145lb engineering student who is standing on beam EDF pulls vertically downward on a rope attached to beam ABC. A second rope is attached vertically between points C and D. If the alligator weighs 985lbs and the
center of gravity of the alligator (the place where the weight can be lumped) is 3ft to the left of the pinned connection at point B, then what is the pulling force of the student?

11ft
3ft
4ft
Tips:
Neglect the weight of the beams.
Draw 2 FBDS, one for each beam.
A
Initially treat this as two separate
beam problems, and then combine
the resulting equations to solve for
the rope tension at A.
The force in the rope is always in
tension (can't push with a rope).
17.5ft
2.5ft

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