Question

a pulley system has four pulleys in all and is 60 percent efficient . calculate 1 . mechanical advantage 2 . the effort required to lift a load of 1200N​

Answer 1

Answer:

MA=2.4

E=500N

Explanation:

MA/VR=Efficiency

so,MA/4=60/100(since VR=no of pulley)

MA=2.4

since, MA=L/E

E=L/MA

E=1200/2.4=500N

Answer 2

Explanation:

m.A =v.R ×efficiency

=4×60/100

=2.4

M.A =L/E

2.4=1200/E

E=500N