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ratelena [41]
3 years ago
3

A system with one fixed and one moveable pulley operates with 90% efficiency. The moveable pulley has a weight of 5 N. Using thi

s pulley system, what is the minimum input force needed to lift a piano weighing 1,595 N?
Physics
2 answers:
otez555 [7]3 years ago
6 0

<u>Answer</u>

800 N


<u>Explanation</u>

Efficiency = (mechanical advantage)/(velocity ratio) × 100%

Mechanical advantage (M.A) = Load/Effort

                                      = (1,595+5)/Effort

                                      = 1,600/Effort

Velocity ratio = 2

90/100 = M.A/2

M.A = 0.9 × 2

       = 1.8

M.A = 1,600/Effort

2 = 1,600/Effort

Effort = 1600/2

        = 800 N


suter [353]3 years ago
4 0

Answer: C. 889 N

..................................................

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