The chain of length L is fixed at its ends and hoisted at its midpoint B using

Question:

The chain of length L is fixed at its ends and hoisted at its midpoint B using a crane. If the chain has a weight density w, determine the minimum height h of the hook in order to lift the chain completely off the ground. What is the horizontal force at pin A or C when the chain is in this position? Hint: When h is a minimum, the slope at A and C is zero.

Given:

L = 80 ft

d = 60 ft

w = 0.5lb/ft

By A d