For the third class lever shown below, an effort of 10 lbs is exerted to lift a load of 5 lbs which is applied 15 ft from the fulcrum. How far from the fulcrum is the effort applied?

7.5 ft


\(\text { length of the effort arm}=\frac{\text { load }}{\text { effort }} \times \text { length of the load arm }=(5 / 10) \times 15 \mathrm{ft}=7.5 \mathrm{ft} \text {. }\)

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