What is the required actual mechanic advantage


A construction crew lifts approximately 560 lb of material several times during a day from a flatbed truck to a 32 ft rooftop. A block and tackle system with 50 lb of effort force is designed to lift the materials.
-What is the required actual mechanic adcantage?
-How many supporting strands will be needed in the pulley system? 

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Mechanical Engineering: What is the required actual mechanic advantage
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