In the diagram above, a rod 50 cm long of uniform cross-section is suspended horizontally…

Physics JAMB 2007

In the diagram above, a rod 50 cm long of uniform cross-section is suspended horizontally on a fulcrum, F, by the action of two forces. What is the weight of the rod?

  • 40N
  • 80N checkmark
  • 120N
  • 200N

The correct answer is: B

Explanation

Being a uniform rod, the height W should be acting at the mid point 25cm mark.
∴ Taking moment about the fulcrum, F,
200 x 10 = W x 10 + 40 x 30
2000 = 10W + 1200
=> 10W = 2000 - 1200
= 800
w = 800/10 = 80N
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