What is the mechanical advantage, neglecting...

Question 1 of 3104866636ee728f7522a1c518238

What is the mechanical advantage, neglecting friction, of tackle number 12 as shown in the illustration? Illustration D029DG

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Question 1 of 31048

What is the mechanical advantage, neglecting friction, of tackle number 12 as shown in the illustration? Illustration D029DG

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🔍 Key Concepts

• Count the number of parts of line actually supporting the moving block (the one attached to the weight W). • Remember that mechanical advantage (ideal) in a block and tackle, neglecting friction, equals the number of supporting parts of line. • Check whether the standing (dead) end of the line is made fast to the fixed block or the moving block and how that affects the count.

💭 Think About

• Looking at tackle 12 only, how many separate rope segments are directly lifting the lower block that carries the weight? • Does the hauling part (where P is applied) itself count as one of the supporting parts of line in this particular reeving? Why or why not? • Is the standing end secured to the upper (fixed) block or the lower (moving) block, and how does that change the total mechanical advantage by one?.

✅ Before You Answer

• Physically trace the rope with a finger from the standing end to the hauling end (P) and count every segment attached to the moving block. • Verify that you are counting only the segments that change length when the moving block rises; each of these provides one unit of mechanical advantage. • Before choosing, compare your count with the typical pattern: if the standing end is on the fixed block the M.A. is odd; if on the moving block the M.A. is even.