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PHYSICS

JAMB 2001 - Question 4

Physics 2001 JAMB Past Questions - Question 4: The diagram above is a block-and-tackle pulley system in which an effort of 80 N is used to lift a load of 240 N. The efficiency of the machine is

Choose the most appropriate option for the gap .

The diagram above is a block-and-tackle pulley system in which an effort of 80 N is used to lift a load of 240 N. The efficiency of the machine is

A: 60%

B: 50%

C: 40%

D: 33%

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Correct Answer

Explanation

V-R=6 ;m.A=240/80=3Efficiency =3/6 *100/1=50%