Question

A pulley system with a mechanical advantage of 15 is used to lift a 1750 N piano to a third floor balcony that is 7 m above the ground. What applied force must the movers use? How much rope will the movers pull in?

Answer 1

Answer:

The  force is $E = 117 \ N$

Explanation:

From the question we are told that

     The  mechanical advantage is  $ME = 15$

     The load is $L = 1750 \ N$

      The  height is  $h = 7 \ m$

Generally mechanical advantage is mathematically represented as

       $ME = \frac{L }{E }$

Here E is the force that must be applied to move the piano

=>     $E = \frac{L}{ ME }$

=>     $E = \frac{1750 }{15 }$

=>     $E = 117 \ N$