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A construction crew lifts about 560 lb of material serveral

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Reference no: EM13344619

A construction crew lifts about 560 lb of material serveral times during the day from a flatbed truck to a 32 foot rooftop. A block and tackle system with a 50 lb of effort force is designed to lift the materials. How many supporting strands will be needed in the pulley system? 

Reference no: EM13344619

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