You are lifting a one-ton weight with a...

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Question 1 of 2066636ee728f7522a1c517f4e

You are lifting a one-ton weight with a swinging boom. When comparing the stresses in 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?

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🔍 Key Concepts

• Vector components of forces along and perpendicular to the boom • How boom angle to the horizontal changes vertical and horizontal components of load • Relationship between boom angle and forces in: heel block, topping lift, masthead fitting, and boom thrust

💭 Think About

• As the boom gets closer to horizontal, what happens to the horizontal component of the load along the boom (thrust)? Larger or smaller? • Think about the topping lift: when the boom is low (20°), is the lift line more vertical or more horizontal, and how does that affect its tension? • For the heel block, is it carrying more load when the boom is trying to push sideways (large horizontal thrust) or when the boom is more upright (load more nearly vertical)?

✅ Before You Answer

• Draw a simple free‑body diagram of the boom at 20° and at 60° with the 1‑ton weight at the end; resolve forces along and perpendicular to the boom. • Compare the horizontal thrust at the heel and the tension in the topping lift at each angle, not just the total 1‑ton load. • Be sure you distinguish between stress in the topping lift itself and stress at the masthead fairlead where that lift changes direction.

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