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?
• Vector components of forces along and perpendicular to the boom as its angle changes • How tension in the topping lift and stress in blocks change when the boom is nearly horizontal vs. more vertical • Relationship between boom angle and compression (thrust) in the boom
• As the boom angle gets closer to horizontal, what happens to the horizontal thrust along the boom needed to support the same weight? • How does the vertical component of the forces change in the topping lift and blocks when the boom moves from 60° down to 20°? • Which members (boom, topping lift, head block, heel block) would you expect to see the greatest change in load when the boom is very low vs. more raised?
• Compare compression (thrust) in the boom at 20° vs. 60° for the same one‑ton load • Consider which part mainly carries vertical load vs. horizontal/axial load as the boom angle changes • Mentally draw a simple force triangle at both angles and check which force must increase most to keep the load in balance
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