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PHYSICS

JAMB 2014 - Question 14

Physics 2014 JAMB Past Questions - Question 14: A machine whose efficiency is 75% is used to lift a load of 1000N .Calculate the effort put in to the machine if it has a velocity ratio of 4.

Choose the correct answers from the options given.

A machine whose efficiency is 75% is used to lift a load of 1000N .Calculate the effort put in to the machine if it has a velocity ratio of 4.

A: 233.33N

B: 333.33N

C: 334.33N

D: 343.32N

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Correct Answer

Explanation

MA/VR×100/1=efficiency

L/E 1/VR×100/1=75

1000/E 1/4×100/1=75

E=250×100/75

E = 333.3N