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In the fig above,A lever of length 200m is used to lift a load of...

Physics
JAMB 1993

In the fig above,A lever of length 200m is used to lift a load of mass 180kg. The pivot at P is 20m from the load. what minimum force F must be applied at the end of the lever [g = 10ms-2]

  • A. 9N
  • B. 18N
  • C. 20N
  • D. 200N
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Correct Answer: Option D
Explanation

Applying the principle of moment

Clockwise moment = anti-clockwise moment.

But moment = force x perpendicular distance

F(200 - 20) = 1800 x 20

F = \(\frac{1800 \times 20}{180}\)

F = 10 x 20 = 200N


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