A pulley system has an mechanical advantage of 10. If a mover used this pulley to lift a piano with a force of 1500 N a distance of 4 m, how much force must the mover use?

(a) 145 N
(B) 40 N
(c) 10 ropes
Explanation:
Mechanical advantage, where and are input and output force respectively
Since MA is given as 10 and input force is 1450 N

Therefore, the mover must use a force of 145 N
(b)
Since also and the is given as 4 m then

(c)
Literally, we need 10 rope segments to support the piano since we utilize the mechanical advantage

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