Question

A construction crew lifts approximately 680 lb. of material several times during a day from a flatbed truck to a 34 ft rooftop. A block and tackle system with 50 lb. of effort force is designed to lift the materials.

How many supporting strands will be needed in the pulley system?

Answer 1

To find the number of strands needed divide the total weight by the force.

680 / 50 = 13.6

Because the answer is not a whole number you would round up to the next whole number.

13.6 rounds up to 14

The number of strands needed would be 14.