You are lifting a one-ton weight with a swinging boom. When comparing the stresses on the rig with the boom at 20° to the horizontal to the stresses when the boom is at 60° to the horizontal, which statement is TRUE?

Question

You are lifting a one-ton weight with a swinging boom. When comparing the stresses on the rig with the boom at 20&deg; to the horizontal to the stresses when the boom is at 60&deg; to the horizontal, which statement is TRUE?

Accepted Answer

Option A: The thrust on the boom is greater at 60&deg;.. As the boom angle increases from 20 degrees to 60 degrees, the vertical component of the load remains constant, but the compressive thrust along the longitudinal axis of the boom increases significantly due to the changing geometry of the rig.

You are lifting a one-ton weight with a swinging boom. When comparing the stresses on the rig with the boom at 20&deg; to the horizontal to the stresses when the boom is at 60&deg; to the horizontal, which statement is TRUE?

You are lifting a one-ton weight with a swinging boom. When comparing the stresses on the rig with the boom at 20° to the horizontal to the stresses when the boom is at 60° to the horizontal, which statement is TRUE?