You are lifting a 5-ton weight with a single...

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Question 1 of 2066636ee728f7522a1c517f49

You are lifting a 5-ton weight with a single whip rove on a swinging boom set at an angle of 60? to the horizontal. Use the formula for the size of a shackle with a safe working load and determine the minimum size shackle that should be used to secure the head block to the boom?

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Question 1 of 20

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🔍 Key Concepts

• Mechanical advantage and line tension in a single whip (no mechanical advantage) system • Effect of boom angle on stress in the topping/boom support system (vertical vs. along-boom forces) • Formula for safe working load (SWL) of shackles based on diameter and how to convert tons to the required shackle size

💭 Think About

• First, figure out whether a single whip changes the load in the line or if the line tension equals the load being lifted. How does that affect the load at the head block? • Resolve the 5‑ton load into forces along the boom and vertically, using the 60° boom angle. How does this change the actual load on the shackle compared to the 5‑ton weight? • Using the shackle SWL formula, calculate what shackle diameter is needed for that increased load, then compare your result to the available answer choices.

✅ Before You Answer

• Confirm whether a single whip provides any mechanical advantage (does the line load equal or differ from 5 tons?). • Check that you used cosine or sine with the correct angle and direction when resolving the forces along the boom. • Verify that your final required shackle diameter is not less than the computed minimum size and choose the nearest larger standard size from the options.

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