Question

4. A block and tackle system has 3 pulleys and efficiency 60%. Calculate mechanical advantage of the system and effort required to lift a load of 720 N.​

Answer 1

Answer:

machinical advantage =1.8

effort =400N

Explanation:

given that, efficiency =60%

VR=3

MA=?

efficiency =MA/VR

60/100=MA/3

MA=60*3/100

MA=1.8

NOW,

MA=load/effort

1.8=720/effort

effort=7200/18

effort=400N

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